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    • 专利摘要:
    Configurable optical device comprising an optical element (1), or several optical elements (1) arranged in cascade, where each optical element (1) comprises an active zone (2) consisting of an input surface and an output surface for beams light, and a perimeter (3). Each optical element (1) comprises at least a first transparent electrode (4) and at least one transparent counter-electrode (5) whose electrical connections are located in the area of the perimeter (3). The device is configured so that, by applying a potential difference between the electrodes (4, 5) of each optical element (1), an electric field is generated that varies the degree of commutation in different areas of the active zone (2) of each optical element (1), thus generating an optical path variation profile of each of the optical elements (1) of the device, which allows focusing an incident light beam in different ways, depending on the electric field applied to each of the electrodes. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2711456A1
    申请号:ES201830891
    申请日:2018-09-14
    公开日:2019-05-03
    发明作者:Morten Andreas Geday；Garcia Manuel Cano；Sanchez Jose Manuel Oton；Arregui Patxi Xabier Quintana；Jacob Andreas Geday
    申请人:Universidad Politecnica de Madrid；
    IPC主号:
    专利说明:

    [0001]
    [0002] Configurable optical device
    [0003]
    [0004] Object of the invention
    [0005]
    [0006] The present invention relates to a configurable (or reconfigurable) optical device capable of introducing a radial variation in the phase profile of an arbitrary incident radiation.
    [0007]
    [0008] The device is based on one or several liquid crystal cells in cascade, provided with structured electrodes in such a way that all the electrodes are accessible from the periphery of the cell, and can therefore be directed independently. The specific design of the electrodes, which forms part of the invention, allows the fabrication of reconfigurable lenses and wavefront correctors.
    [0009]
    [0010] The present invention also relates to a method of manufacturing the configurable optical device mentioned above.
    [0011]
    [0012] The device object of the present invention has application in the scope of the design and commercialization of optical devices for different types of industries, such as aerospace, sanitary, security, transport, communications, etc.
    [0013]
    [0014] Technical problem to be solved and Background of the invention
    [0015]
    [0016] The lenses commonly used are based on the refraction of light. Also known are lenses based on the diffraction of light, also known as Fresnel lenses, which are diffractive fixed focus lenses, without topological loading (or zero topological loading),
    [0017]
    [0018] Certain types of vortex lenses such as diffractive spiral lenses are known in the state of the art. A diffractive spiral lens is characterized by its profile, which is described by its topological load, and in case of being a focus lens, by its focal length.
    [0019]
    [0020] Optical beams of vortex, or vortexes, are less common and little known by the general public. A vortex is an optical beam in which the phase of the light varies spatially in an azimuthal manner around the center of the beam. Typically the phase varies a number that is multiple integer from 2n, in a round around the center of the beam. The number, multiple integer of 2n, is known as the topological load of the vortex.
    [0021]
    [0022] The elements defined in this patent are all elements that change the topological load of an incident beam.
    [0023]
    [0024] Also, a type of contact lens is known, as disclosed in US 5408281 A, which has a spiral geometry and focusing ability.
    [0025]
    [0026] Likewise, US 2008226844 A1 is known, dedicated to configurable spiral phase sheets, but based on a non-uniform alignment and which does not use cascade lenses.
    [0027]
    [0028] Likewise, document WO 2012/080532 is known, which defines a reconfigurable beam reflectarray for frequencies in the terahertz and millimeter wave ranges, based on reconfigurable resonant dipole structures in liquid crystal cells.
    [0029]
    [0030] No optical device is known to date that uses the same structure of passive electrodes to generate diffractive spiral lenses with different focal length, dependent only on the field applied to the different electrodes and without teeth effects (in English aliasing) present in the pixelated devices.
    [0031]
    [0032] To date, no optical device combining two cascade vortices generating structures is known. The combination of such cascading structures of the present invention makes it possible to emulate, by means of a single device, virtually all types of optical lenses, as well as to configure their optical characteristics according to the needs.
    [0033] A device of this type can compete with spatial light modulators (SLM), with the added advantages of having a higher filling factor, of not having toothing effects and of lacking electronic components in the active part thereof, transmitting, for Therefore, a greater amount of light. It is also structurally and electronically simpler and, therefore, more economical.
    [0034]
    [0035] The present invention takes advantage of some of the basic properties of liquid crystals (LC's), in particular their optical and dielectric molecular anisotropes. The fluid nature of LC's combined with its intrinsic dielectric anisotropic implies that, at a macroscopic scale, the material tends to orient itself by offering its highest dielectric constant to the applied field.
    [0036]
    [0037] In the most common LC's, the nematic calam tics, the molecules have an elongated form; the major axis of the molecule corresponds approximately to the axis of the greatest dielectric constant and to the optical axis of anisotropla, also called the indicatrix. Ace! thus, the major refraction index and the greatest dielectric constant are parallel to the major axis of the molecule. These materials are called positive LC's.
    [0038]
    [0039] There are negative dielectric anisotropic LCs, in which the molecular axis coincides with the highest refractive index (the indicatrix) and the lowest dielectric constant. In this description, uniaxial anisotropics are assumed, an approach that is valid for all the relevant cases of liquid crystal (LC) in this invention.
    [0040]
    [0041] In other LC materials, such as the so-called blue phases, an isotropic material can be transformed into anisotropic by applying an electric field. In such cases, the Index tends to increase in the direction of the field, and decrease in the perpendicular direction.
    [0042]
    [0043] Additionally LC's are ordered fluids. They have an intrinsic macroscopic order generated by intermolecular viscoelastic forces that extends to hundreds of pm, which makes it possible to align them, in the absence of external fields, with relatively weak surface interactions.
    [0044]
    [0045] Ace! thus, it is possible to induce a preferential alignment of the LC by means of the appropriate surface treatment, which is transmitted to the rest of the material, provided that the volume of the LC is confined in a cell with parallel faces located at a short distance. This alignment may eventually be altered by applying a external electric field. The switching between one state and another is determined by the plane defined by the direction of alignment and the direction of the electric field.
    [0046]
    [0047] As a consequence, the Index or Indices of refraction that perceives the light passing through an LC can be modified by means of applied electric fields, causing it to vary the optical path length (OLP of the English Optical Light Path) or the polarization state (SOP of the English State of Polarization) of incident light.
    [0048]
    [0049] The modification of the SOP is the foundation on which the liquid crystal (LCD) screens are based. By controlling the SOP, you can control - with the help of a polarizer or two polarizers - the amount of light that passes through the system. An LCD is usually formed by a backlit LC cell or provided with a rear mirror, on which the LC cell is placed between polarizers. The cell has an electric excitation system formed by electrodes in the form of segments (alphanumeric screens) or a rectangular matrix of pixels such as mobile phones, projectors and TV's.
    [0050]
    [0051] The OLP variations are the foundation of LC lenses, and more generic LC photonic devices such as spatial light modulators (SLM). These devices allow to manipulate at least one of the polarizations of the incident wave front.
    [0052]
    [0053] Transparent LC lenses are usually based on concentric electrodes to which different voltages are applied. The connection of concentric elements is complex if you do not opt for multilayer assemblies of the electrodes, which in turn have their own problems. Consequently, complex addressing schemes with very limited tuning ranges or spirally interwoven electrodes must be employed.
    [0054]
    [0055] SLM's are based on technologies derived from the commercial production of LCDs, although they must be prepared to achieve maximum phase delays of 2n, instead of the usual delay required for LCD screens. The high-performance SLMs are based on rectangular arrays of very high-density pixels, which allow almost arbitrary adjustments of the wave fronts. However, most of the screens are of direct vision, with a pixel size of tens of pm (less than the sharpness visual of the human eye), or transmissive projection devices, or reflective devices such as LCoS (liquid crystal on silicon, liquid crystal on silicon).
    [0056]
    [0057] Direct vision devices generally employ thin-film transistors (TFT) in an active matrix, which reduces the number of electrodes needed to control the large number (millions) of individual pixels a screen carries. A significant portion of the active area of the screen is occupied by the TFT and its circuitry, reducing the so-called fill factor (the light transmission) of the screen. The problem is aggravated in the transmissive projection devices, because the small size of their pixels reduces the filling factor to the point that the resolution of such devices is limited in practice. In LCoS reflective devices, transistors and microelectronic circuitry are installed behind the screen and do not affect the fill factor.
    [0058]
    [0059] In either case, the control electronics is above the pixels or below the active area, which is not desirable in certain applications, specifically those in which the LC cell is exposed to intense electromagnetic radiation or ionizing radiation, which can deteriorate the micro and nanoelectronic elements of the circuits.
    [0060]
    [0061] The present invention is presented within this context. It is a transparent device formed by electrodes with various shapes, capable of generating LC lenses of any profile with an arbitrary number of pixels, which are directed from the perimeter of the active area. The device has several advantages over current devices:
    [0062]
    [0063] • It is transparent, unlike most high resolution SLMs.
    [0064] • It lacks electronic elements in the active area
    [0065] • It can be addressed with an arbitrary number of individual pixels, without interconnection or overlapping electrodes in any area.
    [0066] • It has a remarkably high filling factor, only limited by the separation between electrodes
    [0067] • Inherently lack of teething or aliasing effects
    [0068]
    [0069] Apart from liquid crystals, there are other materials with electro-optical effect where the optical anisotropy of the material changes when applying an electric field. In these materials, the refractive index tends to increase in the direction of the field, and decrease in perpendicular direction or vice versa. In the present invention, LCs can be replaced by materials with an electro-optical effect such as Lithium Niobate or by liquids that show Pockels or Kerr effect.
    [0070]
    [0071] Description of the invention
    [0072]
    [0073] In view of the state of the prior art, the following configurable (and / or tunable) optical device is presented, object of the present invention.
    [0074]
    [0075] The configurable optical device object of the present invention comprises a configurable optical element or several configurable optical elements arranged in cascade. Each optical element comprises an active zone constituted by a surface (or transparent substrate) of input and a surface (or transparent substrate) of output for beams of light.
    [0076]
    [0077] Each optical element includes at least a first transparent electrode and at least one transparent counter-electrode (or second electrode).
    [0078]
    [0079] The electrical connections for the electrodes are located in the area of the perimeter of each optical element, so that there are no connection tracks that penetrate the active zone.
    [0080]
    [0081] According to a possible embodiment, the first electrode of at least one of the optical elements is divided into sections, so that the device is configured to generate electric fields of different intensity between each section of the first electrode and the second electrode.
    [0082]
    [0083] The device is configured so that, by applying a potential difference between different sections of the electrodes of each optical element, different electric fields are generated that vary the degree of switching in different areas of the active zone of each optical element, thus generating an OLP variation profile in each of the optical elements of the device. This configures a certain topological load and a certain focus of the incident light beam, according to the pattern of electric fields applied to the sections of the first electrode.
    [0084] According to a possible form of realization, the optical elements are liquid crystal cells (or polymerizable liquid crystal cells) with their corresponding electrodes. Alternatively to the liquid crystal, the optical elements could be constituted by some other electro-optical material (with the capacity to vary its Refraction Index in the presence of an electric field) and its corresponding electrodes.
    [0085]
    [0086] It is thus allowed that there are partial switches (according to the number and arrangement of sections of the electrodes), which allow to locally vary the refractive index of different zones of each optical element.
    [0087]
    [0088] According to a possible form of realization, also the counter-electrode is divided into sections. In this case, both electrodes are configured both to present different electrical potentials in each section, and to present equal electrical potentials in each section. The distribution of sections of the first electrode can be different from the distribution of sections of the counter-electrode, thus allowing the device to be reconfigured (tuned) to create two independent sets of optical path profiles, which changes the topological load and the Focus of an incident light beam in different ways.
    [0089]
    [0090] Optical elements can be arranged in cascade in which the counter-electrode is not divided into sections, or optical elements in which the counter-electrode if it is divided into sections, or a cascade of optical elements in which one has the counter- electrode divided into sections and another has the counter-electrode without division of sections.
    [0091]
    [0092] According to a possible form of realization, an optical element acts as a variable spiral diffractive lens. Depending on the applied pattern, an optical path is produced with a certain focus distance and topological load. Thus, by applying a suitable first pattern of electric fields, the profile of the optical path of the optical element corresponds to that of a diffractive spiral lens with a first focusing distance and a first topological load, while by means of the application of a second suitable pattern of electric fields, the optical path profile of the optical element corresponds to that of a diffractive spiral lens with a second focusing distance and a second topological charge.
    [0093] According to another possible form of realization, a pair of optical elements act together, emulating a variable diffractive lens.
    [0094]
    [0095] According to another possible embodiment, a pair of optical elements act together, emulating a variable axicon.
    [0096]
    [0097] According to another possible form of realization, a pair of optical elements acts together, emulating a variable spiral diffractive lens.
    [0098]
    [0099] According to another possible embodiment, a pair of optical elements act together, emulating the combination of at least two of the following systems: a lens, an axicon or a spiral phase sheet.
    [0100]
    [0101] Thus, by applying the corresponding electric fields, the profile of the optical path of at least one of the adjacent optical elements placed in cascade may correspond to that of a diffractive spiral lens, while the profile of the optical path of at least one of the remaining adjacent optical elements placed in cascade may correspond to that of a spiral phase sheet.
    [0102]
    [0103] According to a particular embodiment, the first electrode of two adjacent optical elements placed in cascade is divided into sections, the distribution of the sections of the first electrode of an optical element being a mirror image of the distribution of the sections of the first electrode of the adjacent optical element .
    [0104]
    [0105] Thus, by applying the corresponding electric fields, the switching profile of the two adjacent optical elements placed in cascade corresponds to that of two spiral diffractive lenses with reverse topology, and the combination of elements emulates a diffractive lens.
    [0106]
    [0107] According to another particular embodiment, by means of the application of the corresponding electric fields, the profile of commutations of two adjacent optical elements placed in cascade corresponds to that of two diffractive spiral lenses. Preferably, both spiral diffractive lenses are positioned in cascade, with a certain separation distance between them, so that the focal length of both lenses coincide, which allows them to work as a telescope or Tunable beam expander, varying the topological load and focus of the lenses, applying the appropriate patterns of electric fields to the sections of the electrodes of the optical elements.
    [0108]
    [0109] According to another particular embodiment, a third element is added to the previous embodiment so that the combination of elements results in a device that does not affect the topological charge of the light.
    [0110]
    [0111] According to a possible embodiment, at least one of the electrodes of at least one optical element includes structures with varying electromagnetic resonance frequencies depending on the degree of switching of the adjacent liquid crystal.
    [0112]
    [0113] According to a possible embodiment, the electrodes have the shape of poles having electromagnetic resonance frequencies for frequencies in the terahertz and millimeter wave and micrometric wave frequencies. By applying a polarization field to the dipoles, a phase profile can be generated for these frequencies as well as the phase profile generated for the embodiments for light beams.
    [0114]
    [0115] The present invention contemplates in turn a method of manufacturing a configurable optical device.
    [0116]
    [0117] The manufacturing method comprises:
    [0118]
    [0119] - arranging an optical element or several optical elements placed in cascade, where each optical element comprises an active zone constituted by an entrance surface and an exit surface for light beams, where each optical element comprises at least a first transparent electrode and less a second transparent electrode, where each optical element has electrical connections for the electrodes, said electrical connections being located in the perimeter zone of each optical element outside the active zone, where each of the optical elements of the device changes the load Topology of an incident light beam.
    [0120] - apply a potential difference between the electrodes of each optical element, thus producing an electric field that varies the refractive index of the optical element, thus generating a profile of selective commutations in each of the optical elements of the device, thus varying the profile of the optical path of each optical element, which changes the topological load of an incident light beam.
    [0121]
    [0122] Preferably, the method contemplates that the optical elements are liquid crystal lenses, each lens consisting of a liquid crystal cell located between at least a first electrode and at least a second electrode.
    [0123]
    [0124] Also, preferably, the method contemplates that the liquid crystal of the lenses be polymerizable also known as reactive mesogen (RM of the English Reactive Mesogen). The method then comprises the possibility of curing (by UV radiation or other curing method) the polymerizable liquid crystal, obtaining a diffractive device with a fixed or partially tunable phase variation profile.
    [0125]
    [0126] According to a possible form of realization, the method comprises applying an electric field between the electrodes of two adjacent optical elements placed in cascade creating a profile of commutations of the two adjacent optical elements corresponding to that of two diffractive spiral lenses. Also, according to a possible embodiment, the method comprises positioning both spiral diffractive lenses in cascade, with a certain separation distance between them, so that the focal length of both lenses coincide, allowing them to function as a telescope or expander of tunable beams, varying the topological load of the lenses.
    [0127]
    [0128] Brief description of the figures
    [0129]
    [0130] As part of the explanation of at least one preferred embodiment of the device, the following figures have been included, wherein the following is represented by way of illustration and not limitation.
    [0131]
    [0132] Figure 1: shows a schematic view of a liquid crystal cell, LC, classic.
    [0133] Figure 2: shows a schematic view of a liquid crystal cell in which the first electrode is divided into sections, the positive dielectric anisotropic LC having.
    [0134]
    [0135] Figure 3: shows a schematic view of a liquid crystal cell in which the first electrode is divided into sections, the negative dielectric anisotropic LC having.
    [0136]
    [0137] Figure 4: shows a schematic view of an LC in blue phase.
    [0138]
    [0139] Figure 5: shows schematically the effect that the different degrees of switching of the nematic LC (Figures 2 and 3) have on an incident beam of linearly polarized light in the same plane of the paper.
    [0140]
    [0141] Figure 6: shows a situation identical to that shown in Figure 5, in a blue phase LC device as shown in Figure 4.
    [0142]
    [0143] Figure 7: shows an example of diffractive phase lens (fresnel lens) (C), whose effect on the phase is equivalent to that of a thick lens (A).
    [0144]
    [0145] Figure 8A: shows schematically an example of spiral phase sheets (SPP) with topological loading 1.
    [0146]
    [0147] Figure 8B: shows schematically an example of spiral phase sheets (SPP) with topological load 2.
    [0148]
    [0149] Figure 9A: shows a spiral diffractive lens (SDL, from English Spiral Diffractive Lens) where a hyperbolic radial phase variation with a topological load 1 has been introduced.
    [0150]
    [0151] Figure 9B: shows a spiral diffractive lens, SDL, where a hyperbolic radial phase variation with a topological load 2 has been introduced.
    [0152]
    [0153] Figure 10A: shows a realization consisting of a spiral phase sheet (SPP) generating cascade optical vortices with the spiral diffractive lens (SDL) of Figure 9A.
    [0154] Figure 10B: shows a realization consisting of a spiral phase sheet (SPP) generating cascade optical vortices with the spiral diffractive lens (SDL) of Figure 9B.
    [0155]
    [0156] Figure 11A: shows a front view of the arrangement shown in Figure 10A.
    [0157]
    [0158] Figure 11B: shows a front view of the arrangement shown in Figure 10B.
    [0159]
    [0160] Figure 12A: shows the result of "chopping" into sections 2n, the arrangement shown in Figure 11A.
    [0161]
    [0162] Figure 12B: shows the result of "chopping" into sections 2n, the arrangement shown in Figure 11B.
    [0163]
    [0164] Figure 13A: shows a simplified structure of 8 electrodes that is used to generate vortices with topological loads of 1.
    [0165]
    [0166] Figure 13B: shows a simplified structure of 8 electrodes that is used to generate vortices with topological loads of 2.
    [0167]
    [0168] Figure 14A: shows a diffractive lens with simplified structure of 8 electrodes to generate diffractive spiral lenses (SDL) with topological loads of 1.
    [0169]
    [0170] Figure 14B: shows a diffractive lens with a simplified structure of 8 electrodes to generate diffractive spiral lenses (SDL) with topological loads of 2.
    [0171]
    [0172] Figure 15A: shows two spiral diffractive cascade lenses, with topological loads of 1 and -1.
    [0173]
    [0174] Figure 15B: shows two spiral diffractive cascade lenses, with topological loads of 2 and -2.
    [0175]
    [0176] Figure 16A: shows the result of associating the spiral diffractive lenses of Figure 15A.
    [0177] Figure 16B: shows the result of associating the spiral diffractive lenses of Figure 15B.
    [0178]
    [0179] Figure 17A: shows the cascade association of two different spiral diffractive lenses, with topological loads of 1 and -1.
    [0180]
    [0181] Figure 17B shows the cascade association of different spiral diffractive lenses, with topological loads of 2 and -2.
    [0182]
    [0183] Figure 18A: shows the result of associating the spiral diffractive lenses of Figure 17A.
    [0184]
    [0185] Figure 18B: shows the result of associating the spiral diffractive lenses of Figure 17B.
    [0186]
    [0187] Figure 19A: shows a spiral diffractive lens structure as shown in Figure 14A, but with a more twisted spiral pattern.
    [0188]
    [0189] Figure 19B: shows a spiral diffractive lens structure as shown in Figure 14B, but with a more twisted spiral pattern.
    [0190]
    [0191] Detailed description
    [0192]
    [0193] The present invention relates, as already mentioned above, to a configurable optical device.
    [0194]
    [0195] The device is based on an optical element or a pair of optical elements (1) which, preferably, are LC cells with multiple electrodes (4, 5).
    [0196]
    [0197] Each LC cell is constructed as a classic LC cell (see Figure 1) with the LC (1.a) sandwiched between two transparent substrates (1.b.1 and 1.b.2) with electrodes (4, 5) equally transparent, and treated with an agent or alignment layer (1.d.1 and 1.d.2).
    [0198]
    [0199] When an electric field is applied between the counter-electrode (5) or upper electrode (as shown in the figures) and the first electrode (4) or lower electrode (such as shown in the figures), the LC is aligned to a certain point that depends on the viscosity of the material, the anchoring forces of the surface layers (1.d.1 and 1.d.2), the thickness of the LC (1.a) and the intensity of the electric field.
    [0200]
    [0201] To create an arbitrary switching profile, at least one of the electrodes is separated into sections (41), and the appropriate electric field is applied between each section of electrodes (41) and counter-electrode (5).
    [0202]
    [0203] Figures 2, 3 and 4 show three different switching states corresponding to three different switching voltages (V1 <V2 <V3) in a positive nematic LC (2.a in Figure 2), a negative nematic LC (3.a in Figure 3) and a blue phase LC (4.a in Figure 4). In each of the figures, the layers marked b, and d, as well as the electrode layer (4, 5), are analogous to the layers of the optical element (1) in Figure 1. The state of the LC is denoted by the ellipses (the ellipticity indicates the degree of anisotropy) and the orientation indicates the macroscopic orientation of the optical axis.
    [0204]
    [0205] The alignment layers (d) of the nematic cells (Figures 2 and 3) are conditioned to produce a homogeneous alignment in the case of liquid crystals with positive dielectric anisotropic (Figure 2) and homeotropic in the case of liquid crystals with negative dielectric anisotroph (Figure 3). Thus, the switching of the LC occurs in a plane perpendicular to the substrates (in figures 2 and 3 in the plane of the paper). For the LC in blue phase, the alignment layers (d in Figure 4) are not essential.
    [0206]
    [0207] Figure 5 shows the effect that the different degrees of switching of the nematic LC (Figures 2 and 3) have on an incident beam of linearly polarized light in the same plane of the paper. The light falls from an isotropic medium (5.I), crosses an anisotropic medium (5.II) and exits to a new isotropic medium (5.III). If the dimensions of the sections of the electrodes 41 are sufficiently small, the light recombines in a direction slightly deviated from the incident direction. Continuous horizontal, or almost horizontal, traces show the progression of the assumed beam a flat incident wave.
    [0208]
    [0209] Figure 6 shows a situation identical to Figure 5 in a device with LC in blue phase (6.II) as described in Figure 4. In this case it is not necessary that the incident beam be polarized.
    [0210] The devices of the invention are composed of an optical element (1) or several optical elements (1) or LC cells mounted in cascade. Each of them introduces a spatial distribution of relative phase differences to an incident wave front. The induced phase difference ranges from 0 to a full wavelength (A), equivalent to a range of 0 - 360 ° or 0 - 2n radians. According to the embodiment of the invention in question, the LC cells can be joined or separated a certain distance. In the second case, the cells can emulate composite optical elements, such as telescopes or beam expanders.
    [0211]
    [0212] Each cell works in a similar way to a spiral diffractive lens (SDL) or to a spiral phase sheet (SPP) of the English Spiral Phase Plate. In these lenses in the form of sheets, the phase equivalence between multiple delays of 2n radians is used, which allows to reduce the optical thickness of the device in intervals equivalent to 2n delays. The phase difference can be achieved by modifying the physical thickness - a microscopic version of the known Fresnel lenses - or the effective index of refraction, as in the examples shown in Figures 2, 3 and 4.
    [0213]
    [0214] Figure 7 shows an example of a phase diffractive lens (C), whose effect on the phase is equivalent to that of a thick lens (A). The lens is cut into sections (B) whose thickness is A / (n1-n2), where n1 is the Index of the material (typically glass, n1 «1.5) and n2 the index of the surrounding medium (typically air, n2« 1.0).
    [0215]
    [0216] The diffractive lens has a spatial variation of PLO from 0 to A, but it has the same operation, in first approximation, as the thick lens of much greater variation of PLO.
    [0217]
    [0218] The relative phase delay, 5, between different zones of the wavefront that propagates through different points of the diffractive lens is (2n / A) ^ (n1-n2) ^ d, where d is the thickness. Each section produces relative delays, 5, between 0 and 2n for thicknesses d between 0 and A / (n1-n2).
    [0219]
    [0220] In the case shown in Figure 7, the difference in delay, or OLP, comes from the fact that the wavefront propagates in different proportions in different media (typically air and the glass or plastic lens).
    [0221] The same spatial variation of OLP can be achieved with a flat device with parallel faces in which d is constant, but where there is a spatial distribution of refraction indices in sections equivalent to those mentioned above.
    [0222]
    [0223] Although currently the electrooptic material easier to adapt to the proposed device will be the LC commuted by an electric field, the state of the LC can be modified by a magnetic field, or heat, achieving the same effect.
    [0224]
    [0225] There are also alternative materials such as lithium niobate (LiNbO3), or liquids that show Pockels or Kerr effect, which are electro-optical and whose indices of refraction can be varied or reoriented by applying an electric field.
    [0226]
    [0227] The present invention relates to an optical device formed by a reconfigurable optical element (1), typically LC, or several reconfigurable optical elements (1), typically LC, in cascade, glued to each other, or located at a certain distance . The elements have certain variable optical properties that can be modified by external control. The LC elements are spiral diffractive lenses (SDL) whose topological load, and whose focal length can be reconfigured. The focal distance of the element can be designed to be finite or infinite. If the focal length is infinite, the SDL is transformed into a spiral phase sheet (SPP) like those shown in Figure 8. The sections of the electrodes (41) of these sheets are shaped as non-spiral circular sectors (figures 13A and 13B); the name of the SPP sheet refers to the spiral profile that adopts the phase delay.
    [0228]
    [0229] SDL spiral diffractive finite focal length lenses are manufactured with LC cells whose sections of the electrodes (41) are in the form of spiral sectors. Each section (41) has an origin very close to the center, and widens and rotates as it approaches the outer perimeter zone. All the sections of the electrodes (41) reach the perimeter zone, so that they can be connected to the external control electronics by direct excitation with independent contacts.
    [0230]
    [0231] The spiral shape of the sections of the electrodes (41) (see Figures 14 A and 14B) determines the distortion of the wave front that occurs as a result of the action of the two LC elements in cascade. The two-element cascaded LC device is capable of emulating a conventional phase diffractive lens (Figure 7C) with a fidelity that depends on the number of sections of the electrodes (41). To exactly emulate an ideal phase diffractive lens an infinite number of elements would be needed; the greater the number of sections of the electrodes (41), the greater the approximation achieved.
    [0232]
    [0233] Different forms of realization of the invention are described below.
    [0234]
    [0235] The first of the preferred embodiments consists of two elements in cascade.
    [0236]
    [0237] In this embodiment one of the LC cells is a spiral phase sheet (SSP), with a reconfigurable azimuthal phase profile, as shown in Figures 8A and 8B. The darkest shading corresponds to a phase difference of zero radians, while the lightest zone is a difference of 2n radians. The patterns shown in the figures correspond to lamellae of delay that generate optical vortices with a topological load of 1 (Figure 8A) and 2 (Figure 8B). The patterns shown in Figures 8A and 8B are two configurations of the same element.
    [0238]
    [0239] The other reconfigurable LC element of this embodiment has a spiral component formed by a number of sections of the electrodes (41) that are excited at different voltages in order to generate a profile of phase delays between 0 and 2n radians.
    [0240]
    [0241] Figure 9A shows the element in a spiral diffractive lens configuration, SDL, which introduces a hyperbolic radial phase variation with a topological load 1; in the configuration of the same element in Figure 9B the radial phase variation is also hyperbolic, but the topological load is 2 and the focal distance is half that of Figure 9A. In general, the topological load is determined by the number of spirals, while the focal distance is smaller the greater the rotation of each spiral. As in the previous element, the range of gray scales shows delays that oscillate between 0 (black) and 2n radians (white). The patterns shown in Figures 9A and 9B are two configurations of the same element.
    [0242]
    [0243] Figure 10 shows the embodiment, consisting of a spiral phase sheet (SPP) generating cascade optical vortices with a spiral diffractive lens (SDL). The central axis is indicated, which usually coincides with the optical path. The two configurations mentioned appear in Figures 10A and 10B.
    [0244] Cascading the spiral phase sheet of Figure 8A with the spiral diffractive lens of Figure 9A generates a phase delay equivalent to the phase sheet shown in Figure 11A. Similarly, the spiral phase sheet of Figure 8B together with the spiral diffractive lens of Figure 9B produce a delay equivalent to the phase sheet of Figure 11B. The phase delays of Figures 11A and B vary between 0 (black) and 4n radians (white).
    [0245]
    [0246] The distributions of Figure 11 can be divided into sections 2n, taking advantage of the phase equivalence between multiple delays of 2n radians, analogously to the lens of Figure 7A. As a result, the phase distributions of FIG. 12 are obtained. The phase delays of FIGS. 12A and B vary between 0 (black) and 2n radians (white).
    [0247]
    [0248] The two phase difference maps of Figure 12 correspond to diffractive phase lenses with a hyperbolic phase variation that underlies the definition of the spiral diffractive lens (SDL) of Figure 9. The maps, and consequently the two configurations, therefore, correspond to two diffractive phase lenses with different foci.
    [0249]
    [0250] To emulate the spiral phase sheets generating optical vortices, which were shown in Figure 8, an electrode geometry in angular sections (41) common to both structures can be used. Figure 13 shows a simplified structure of 8 electrode sections (4) which is used to generate topological loads of 1 (Figure 13A) and 2 (Figure 13B). The gray scale of Figure 13 represents different electric field strengths applied to the electrodes. The applied field is the greater the lighter the level of gray.
    [0251]
    [0252] Similarly, the spiral diffractive lens structures of Figure 9 can also be approximated by a common geometry of sections of the electrodes (41), as shown in Figure 14. As in the previous case, a simplified structure of 8 sections of the electrodes (41) to generate topological loads of 1 (Figure 14A) and 2 (Figure 14B). The gray scale of Figure 14 represents different electric field strengths applied to the sections of the electrodes (41), in order to generate equidistant phase differences in the LC cells. The applied field is the greater the lighter the level of gray.
    [0253] The active area of Figure 14 is reduced to the spiral zone. The external part is only a visual guide to observe the eight sections of electrodes (41) addressed in both topologies and potentially can be the connection zone of the electrode sections (41).
    [0254]
    [0255] Cascading two LC cells, one with the pattern of electrode sections (41) of Figure 13, and the other with the pattern of Figure 14 achieves a device that functions as a diffractive lens like the ones shown in the Figure 12. The focal length can be varied between two or more values, modifying the voltages applied to each of the electrode sections (4).
    [0256]
    [0257] The number of different focal distances that can be achieved is determined by the number of electrode sections (4) that contain both patterns. Likewise, the number of electrode sections (4) establishes the greater or lesser fidelity with which the discrete pattern of electrodes reproduces the ideal analogue phase variation. In the examples of the figures, only 8 electrodes have been used for simplicity. The actual devices of the invention, in general, include tens or hundreds of electrode sections (41).
    [0258]
    [0259] The second preferred embodiment is formed by two LC cells with electrode sections (41) which form reconfigurable, diffractive spiral lenses. Its fundamental characteristic is that the cells have opposite topological charges: one of them increases the phase differences in a clockwise direction while the other increases them counterclockwise. The two lenses are designed with the same topological load and focal length. The topological charges are canceled, so that the resulting phase difference lacks angular momentum. A diffractive lens is thus obtained which behaves like conventional diffractive lenses, with the advantage of being reconfigurable and with the connection of the electrode sections (41) in the perimeter area (3) or outer part, leaving the active area ( 2) or inner part with its entrance surface and its free exit surface and clear of connections and electronic components.
    [0260]
    [0261] Figure 15 shows two spiral diffractive cascade lenses. The lenses of Figure 15A are configured to have topological loads 1 and -1, while those of Figure 15B are configured to have topological loads 2 and -2.
    [0262] Cascading the diffractive spiral lenses of Figure 15A, and chopping the output phase difference maps into sections of 2n, taking advantage of the phase equivalence between multiple delays of 2n radians, produce a distribution of phase differences (Figure 16A) analogous to that shown in Figure 12. Similarly, the spiral lenses of Figure 15B generate the distribution shown in Figure 16B.
    [0263]
    [0264] Analogously to the first preferred embodiment, both configurations of Figure 16 can be achieved with the same pattern of electrode sections (41) by applying different electric fields, as shown in Figure 14.
    [0265]
    [0266] The two LC cells of the second preferred embodiment can be identical, provided that in the cascade assembly one of the cells is turned, facing two equal faces so that the direction of rotation of the spiral is inverted, causing the sign of the Topological load is opposite in each cell.
    [0267]
    [0268] In the third preferred embodiment, two reconfigurable LC cells are used in cascade configured with opposite topological loads, that is to say, they increase the phase clockwise and counterclockwise respectively. The cells have electrode sections (41) configured as spiral diffractive lenses. Unlike the second preferred embodiment, the spirals are not necessarily adjusted to generate the same focal distance, although the number of spirals - and consequently the topological load - is the same. Thus, the output beam will have a phase difference profile without any induced angular momentum.
    [0269]
    [0270] The two preferred embodiments above are particular cases of this. The first embodiment will be an extreme case in which one of the LC cells is a spiral diffractive lens with infinite focal distance, that is, a spiral phase sheet. The second is the case in which the focal length of both lenses is equal.
    [0271]
    [0272] In Figure 17 different spiral lenses are shown, with topological charges equal two to two although with opposite signs. Each of the cells has a variable focal length. Figure 17A shows two cells configured with topological loads 1 and -1 respectively. Cascading the lenses produces a distribution of phase differences that, if cut into sections 2n as shown in Figure 12, generate a spiral diffractive lens as shown in Figure 18A.
    [0273]
    [0274] Figure 17B shows two cells configured with topological loads 2 and -2 respectively. By cascading the sheets a distribution of phase differences occurs which, if cut into sections 2n as shown in Figure 12, generates a diffractive phase lens as shown in Figure 18B.
    [0275]
    [0276] In this preferred third embodiment, the pattern of sections of the active electrodes (41) of the two LC cells is generally different. For example, one of the cells could have a pattern like the one shown in Figure 14, while the other could have a different, more twisted pattern, like the one shown in Figure 19. The spiral lenses generated by the elements of Figure 19, for any non-zero topological load, have a lower focal length than the equivalent lenses of Figure 14.
    [0277]
    [0278] In the fourth preferred embodiment, the LC cells that make up the device do not necessarily have complementary topologies. As a consequence, the equivalent spiral diffractive lens will be a sheet with a topological charge sum of the two cells. This realization can have application in systems where the topological load is irrelevant for its functionality. It is also useful in systems in which it is important to maintain the central singular point, characteristic of the light beams with topological charge; in such cases, obviously, cancelation of topological loads is not appropriate.
    [0279]
    [0280] The three preferred embodiments above are particular cases of this.
    [0281]
    [0282] In the fifth preferred embodiment, the conventional continuous electrode (5) or the conventional electrode patterns mentioned in this invention are substituted for excitation of the liquid crystal and consequent generation of phase differences. The electrodes are replaced by a matrix of interconnected resonant poles. These poles typically resonate at frequencies in the microwave region (GHz or THz), as described in WO 2012080532 A1. The structure of the device remains the same, as shown in Figure 1, and the device generates the same type of lag patterns as those shown above.
    [0283] The fundamental difference is in the interaction between the electromagnetic wave and the device: The phase shift is not the consequence of a delay of the electromagnetic wave when passing through a variable variable material, as in the previous embodiments, but the consequence of the interaction between the electromagnetic wave and dipoles (or sections of electrodes) with variable resonance frequencies. By varying the resonance frequency of a dipole, or set of dipoles, the phase shift that is introduced into the electromagnetic wave is varied. The resonant frequency of a dipole - and consequently the phase delays introduced by the dipole - is determined by the switching state of the adjacent LC. As in the cited patent, the switching state of the LC is controlled by connecting the resonant dipoles to a low frequency AC electrical signal and to the desired voltage.
    [0284]
    [0285] In correspondence with the previous embodiments, all the dipoles corresponding to a section (41) of an electrode (4) are characterized exclusively by a single switching state of the LC. The dipoles are interconnected and distributed in zones equivalent to the electrodes (4) shown above.
    [0286]
    [0287] In all the aforementioned implementations there is the possibility of placing the two optical elements (1) or lenses at a distance not null.
    [0288]
    [0289] According to a sixth preferred embodiment, two spiral diffractive lenses (SDL's) are placed at a given distance, so that the focal length of both lenses coincide. By changing the topological load of both elements, and consequently their focal length, the position of the point of coincidence of the focal distances between both devices can be changed. In this way you can generate a telescope or a tunable beam expander, or more complex optical devices. If desired, any remaining topological charge may be removed by including a third optical element (1), for example, a spiral phase sheet.
    [0290]
    [0291] The seventh preferred embodiment is the simplest implementation of all, but it can only be applied in those environments in which the topological load of the output beam is irrelevant. Such could be the case of an intraocular lens such as that of US 005408281 A. The embodiment consists of a single element, with the specific design of electrodes described above, and its eventual application as Focusing device, specifically to the generation of lenses with reconfigurable focus represents an innovative contribution.
    [0292]
    [0293] The LC devices generally have a pattern of electrode sections (41) in a first electrode (4) (or first plate) of the cell and a counter-electrode (5) or continuous electrode in the opposite part of the cell; this counter-electrode (5) (or second electrode) is known as a ground plane and is shown continuously in Figures 2, 3 and 4.
    [0294]
    [0295] The eighth preferred embodiment is a variation of the elements of the previous embodiments, minus the fifth. The difference lies in that the counter-electrode (5) of one or more elements is divided into sections (41) just like the first electrode (4) in the same optical element (1) (Figures 2, 3 and 4). But the pattern of sections in the counter-electrode (5) is different from the pattern of sections (41) in the first electrode (4).
    [0296]
    [0297] In this way, one of the electrodes (4 or 5) could have the pattern corresponding to a spiral lens like that of Figure 14, while the other adjacent electrode (5 or 4) of the same cell could have the corresponding pattern the spiral lens of Figure 19.
    [0298]
    [0299] If two electrode patterns (4 and 5) are available in the same cell, it can be chosen by addressing which structure of reconfigurable spiral lenses is activated, leaving the spiral of the counter-electrode (the electrode (5 or 4)) of the cell with all its sections interconnected to each other at the same tension.
    [0300]
    [0301] In a preferred ninth embodiment, one or more elements are filled with a polymerizable liquid crystal. This allows to tune the devices with electric field and cure them while the electric field is applied (usually by means of UV light), which will obtain a fixed lens profile, once the liquid crystal has polymerized. Once the LC is polymerized, the lens can be removed from its cell as an extremely thin lens, whereby the electrodes (4 and 5) in this embodiment are not necessarily transparent.
    [0302]
    [0303] This embodiment represents an innovative way of manufacturing fixed lenses, with or without topological loading, which can be used in association with other fixed or adjustable optical elements.
    [0304] The shape of the sections (41) of the electrodes (4) or of both electrodes (electrodes and counter-electrodes), in one or more LC elements, determines the characteristics of the lens, both in terms of its nominal focal length as in its spherical aberrations. It is trivial to generate lenses with hyperbolic profile, spherical or any other quadratic profile, or axicones; It is even possible to introduce spherical or other aberrations by designing the sections of the electrodes properly.
    [0305]
    [0306] Thus, the process for designing the first electrodes (4) or active electrodes is as follows:
    [0307]
    [0308] • The lens with the desired profile is defined, including aberrations if necessary.
    [0309]
    [0310] • This lens is cut into sections 0 - 2n, corresponding to a diffractive lens.
    [0311]
    [0312] • A spiral phase sheet configured as an optical vortex of the desired topology is subtracted from this diffractive lens.
    [0313]
    [0314] • The resulting diffractive spiral lens is divided again at intervals 0 - 2n.
    [0315]
    [0316] • The analog variation is discretized according to the number of number of discrete sections (41) that will be used.
    [0317]
    [0318] • Each of the discrete sections (41) extends from the periphery of the LC cell to the center (the section can be continuous or a dipole set).
    [0319]
    [0320] • A contact zone outside the active zone is defined for each discrete section (41).
    [0321]
    [0322] • The two electrodes are manufactured and treated with an appropriate alignment agent or layer.
    [0323]
    [0324] • The cell is assembled with at least one, or potentially two electrodes (4 and 5) with the designed patterns.
    [0325] • Fill the cell with the desired liquid crystal, which has the appropriate birefringence, and seal.
    [0326]
    [0327] • The appropriate electrical connection is made to the number of electrodes.
    [0328]
    [0329] • It is mounted, if relevant, in cascade with another cell manufactured in a similar way, although neither the spiral diffractive lenses nor the spiral phase sheets generating optical vortices are necessarily equal.
    [0330]
    [0331] The result is an LC element or several reconfigurable LC elements that work in association, where each of them and the assembly must be considered as a spiral diffractive sheet with its own topological charge and lenticular profile, which can be reconfigured.
    权利要求:
    Claims (17)
    [1]
    Configurable optical device characterized in that it comprises an optical element (1) configurable with an active zone (2) constituted by an entrance surface and an exit surface for light beams and a perimeter zone (3), where the element optical (1) comprises at least a first transparent electrode (4) divided into sections (41) and at least one counter-electrode (5) transparent, where the optical element (1) has electrical connections for the electrodes (4, 5) ) and / or sections (41), said electrical connections being located in the perimeter zone (3) of the optical element (1), where the device is configured so that, by applying potential differences between each section (41) of the first electrode (4) and the counter-electrode (5), electric fields are generated that selectively vary the degree of switching of the optical element (1) respectively in zones corresponding to the sections (41) of the first electrode (4), generating asl an optical path profile, which configures a certain topological load and a certain focus of an incident light beam, according to the pattern of electric fields applied to the sections (41) of the first electrode (4), where the device is configured so that by applying a suitable first pattern of electric fields, the profile of the optical path of the optical element (1) corresponds to that of a diffractive spiral lens with a first focusing distance and a first topological load, and so that by means of the application of a second suitable pattern of electric fields, the profile of the optical path of the optical element (1) corresponds to that of a diffractive spiral lens with a second focusing distance and a second topological charge.
    [2]
    2. Optical configurable device according to claim 1, characterized in that the counter-electrode (5) is also divided into sections, and consequently both electrodes (4, 5) are configured both to present different electrical potentials in each section, and to present equal electrical potentials in each section, and where the distribution of sections of the first electrode (4) is different from the distribution of counter-electrode sections (5), thus enabling the device to be reconfigured to create two independent sets of profiles of path optical, which changes the topological load and the focus of an incident light beam in different ways.
    [3]
    3. Optical configurable device according to any of the preceding claims, characterized in that it comprises a first optical element (1) and a second optical element (1) placed in cascade with the first optical element (1), where the first optical element (1) ) has its counter-electrode (5) without divisions in sections, and where the second optical element (1) has its counter-electrode (5) divided into sections.
    [4]
    4. Configurable optical device according to claim 1, characterized in that it comprises two optical elements (1) placed in cascade.
    [5]
    5. Configurable optical device according to claim 2, characterized in that it comprises two optical elements (1) placed in cascade.
    [6]
    6. Optical device configurable according to any of the preceding claims, characterized in that the switching material in one or more of the optical elements (1) is a liquid crystal.
    [7]
    7. Configurable optical device according to any of the preceding claims, characterized in that the switching material in one or several of the optical elements (1) is a polymerizable liquid crystal.
    [8]
    Optical configurable device according to any of claims 3 to 7, characterized in that it is configured so that, by applying the corresponding electric fields, the optical path profile of the adjacent optical elements (1) placed in cascade corresponds to that of spiral diffractive lenses.
    [9]
    9. Reconfigurable optical device according to any of claims 3 to 7, characterized in that it is configured so that, by means of the application of the corresponding electric fields, the optical path profile of the adjacent optical elements (1) placed in cascade corresponds to that of spiral phase sheets.
    [10]
    10. Optical configurable device according to any of claims 3 to 7, characterized in that it is configured so that, by means of the application of the corresponding electric fields, the optical path profile of at least one of the adjacent optical elements (1) placed in cascade corresponds to that of a diffractive spiral lens and that the profile of at least one of the remaining adjacent optical elements (1) placed in cascade corresponds to that of a spiral phase sheet.
    [11]
    11. Configurable optical device according to claim 8, characterized in that two diffractive spiral lenses are positioned in cascade, with a certain distance of separation between them, so that the focal length of both lenses coincide, which allows them to work as a telescope or tunable beam expander, varying the topological load and focus of the lenses, applying the appropriate patterns of electric fields to the sections of the electrodes of the elements.
    [12]
    12. Configurable device according to any of the preceding claims, characterized in that one of the electrodes (4, 5) includes structures with varying electromagnetic resonance frequencies according to the switching state of the adjacent liquid crystal.
    [13]
    13. Method of manufacturing a configurable optical device, characterized in that it comprises:
    - arranging at least two optical elements (1), according to claims 1 and / or 2, arranged in cascade;
    - apply a pattern of potential differences between the sections (41) of the first electrode (4) and the counter-electrode (5) of each optical element (1), thus producing! an electric field that varies the profile of commutations and consequently the profile of the optical path of the optical element (1), which changes the topological load of an incident light beam.
    [14]
    Method for manufacturing a configurable optical device according to claim 13, characterized in that the optical elements (1) use liquid crystal as an electro-optical material.
    [15]
    15. Method of manufacturing an optically configurable device according to claim 14, characterized in that the optical elements (1) use polymerizable liquid crystal as an electro-optical material and where the process comprises curing the polymerizable liquid crystal, obtaining a diffractive device with a profile of Variation of fixed phase or partially tuneable.
    [16]
    16. Method of manufacturing a configurable optical device according to any of claims 13 to 15, characterized in that it comprises applying an electric field between the electrodes (4, 5) of two adjacent optical elements (1) placed in cascade creating a profile of commutations of the two adjacent optical elements (1) corresponding to that of two diffractive spiral lenses.
    [17]
    Method of fabrication of a configurable optical device according to claim 16, characterized in that it comprises positioning both spiral diffractive lenses in cascade, with a certain distance of separation between them, so that the focal distance of both lenses coincide, which allows them to work as a telescope or tunable beam expander, varying the topological load of the lenses.
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    同族专利:
    公开号 | 公开日
    EP3851911A1|2021-07-21|
    JP2022500697A|2022-01-04|
    EP3851911A4|2021-10-06|
    KR20210058859A|2021-05-24|
    WO2020053463A1|2020-03-19|
    US20220050355A1|2022-02-17|
    ES2711456B2|2020-12-15|
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    PCT/ES2019/070599| WO2020053463A1|2018-09-14|2019-09-11|Configurable optical device|
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    US17/274,865| US20220050355A1|2018-09-14|2019-09-11|Configurable optical device|
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