Abstract: It is proposed an image sensor comprising pixels for acquiring color information from incoming visible light, wherein said image sensor comprising three pixels being partially covered by a color splitter structure for deviating only one color channel of said incoming visible light towards one of said three pixels, and for deviating other colors of said incoming visible light towards the other pixels among said three pixels.

Abstract: In one embodiment of the disclosure, a diffraction grating structure is proposed comprising several grating lines. The diffraction grating structure is associated with a propagation layer, and the diffraction grating structure is made of a material that has a refractive index being equal to n2(?). The diffraction grating structure is remarkable in that it comprises T grating lines per ?m, with T=(n2(?)+1)/2?, where ? is a wavelength defined from an incident electromagnetic wave.

Abstract: In example embodiments, a waveguide display apparatus includes a waveguide comprising a substrate, a plurality of diffractive grating elements on the waveguide, and at least two coating layers on the waveguide between the substrate and the diffractive grating elements. The grating elements may be elements of a diffractive in-coupler. Some embodiments include three coating layers, with a middle layer having a refractive index greater than that of the substrate, the middle layer being between two layers having a refractive index lower than that of the substrate. Some embodiments further include a fourth coating layer.

Abstract: The present disclosure relates to an image sensor (21) comprising an array of pixels, wherein a set of pixels of the array comprises pixels with different height levels arranged according to their height level and relative position to an optical axis (22) of the image sensor, wherein each pixel of the set can take one height level i among N different height levels, N?2, where i=1 is the smallest height level and i=N is the highest height level. According to the disclosure, for a pixel of the set having a first height level equal to n, 2?n?N, and an adjacent pixel of the set having a second height level equal to m, lower than the first height level, in at least one of horizontal, vertical, or diagonal scanning direction, from a point at which the optical axis (22) intersects the image sensor (21) to at least one rim of the image sensor, the second height level m is equal to n?1.

Abstract: A device includes a host medium having a first refractive index value; a first layer comprising a first dielectric material having a second refractive index value, wherein the second refractive index value is greater than the first refractive index value, and wherein the first layer comprises a first step structure at a boundary between the first layer and the host medium; and a second layer comprising a second dielectric material and comprising a second step structure, the second layer having a third refractive index value higher than the first refractive index value of the host medium, wherein the second step structure is stacked on the first step structure, and, in response to an incident electromagnetic wave reaching the device, a first nanojet beam generated by the first step structure and a second nanojet beam generated by the second step structure are combined and focused around a first focusing point.

Abstract: Example embodiments include an optical system comprising a waveguide substrate. A diffractive coupler is associated with the waveguide substrate, the diffractive coupler comprising at least two diffraction gratings. Each of the diffraction gratings includes a first layer of grating elements and a second layer of grating elements, the first and second layers of grating elements being arranged in different planes. The first and second layers of grating elements each have a grating period associated with the respective diffraction grating, and the grating elements of the second layer have a lateral offset with respect to the grating elements of the first layer.

Abstract: Embodiments include an optical system that may be included in a waveguide display. A waveguide apparatus according to some embodiments includes an in-coupler grating having a first grating vector G1 substantially perpendicular to a first axis, x; a first eye pupil expander grating having a second grating vector G2 and a first angle ?G with respect to the first axis; a second eye pupil expander grating having a third grating vector G3 and an angle substantially equal to 90° + ?G with respect to the first axis; and an out-coupler grating having a fourth grating vector G4 substantially perpendicular to the first axis. Example embodiments describe relationships among the grating vectors, the angle ?G, and associated parameters to achieve a satisfactory field of view while reducing distortion.

Abstract: In example embodiments, an optical component includes a dielectric structure having a substantially rectangular cross-section with an upper surface and a lower surface. A first electrically conducting layer is provided on the upper surface, where the first electrically conducting layer has a first opening positioned to accept incoming electromagnetic radiation. The second electrically conducting layer has a second opening positioned to emit electromagnetic radiation, e.g. toward a CMOS sensor pixel in a silicon substrate. The dimensions of the optical component are configured to provide constructive interference for incident radiation of a selected wavelength.

Abstract: In example embodiments, an optical system includes a waveguide having a first surface and a second surface substantially opposite the first surface. A reflective diffractive in-coupler is provided in the waveguide between the first and second surfaces for coupling blue light. A first transmissive diffractive in-coupler is provided in the waveguide between the reflective diffractive in-coupler and the second surface for coupling red light. Some embodiments further include a second transmissive diffractive in-coupler on the first surface for coupling blue light at high incident angles. Green light may be coupled by one or more of the in-couplers. The waveguide may further be provided with corresponding diffractive out-couplers for use in a waveguide display system.

Abstract: In example embodiments, a diffraction grating includes a substrate having an outer surface, the substrate having a first refractive index. A plurality of grating elements are provided on the substrate. The grating elements may have a step-like structure. In some embodiments, each grating element includes a stepped channel that is inset into the substrate. The stepped channel has a second refractive index greater than the first refractive index. In some embodiments, the stepped channel is a two-step channel having a first step along the outer surface of the substrate and a second step extending inward from the first step. In some embodiments, the first step has a greater width than the second step.

Abstract: Embodiments include an optical system that may be included in a waveguide display. An example apparatus includes an image generator configured to generate an image having an upper portion and a lower portion. A waveguide is provided with an in-coupler and an out-coupler, the in-coupler being arranged to couple the upper and lower portions of the image along an optical path to the out-coupler. Along the optical path, at least first and second polarization-selective diffraction gratings are configured to cooperatively direct the upper portion of the image toward the out-coupler. At least third and fourth polarization-selective diffraction gratings are configured to cooperatively direct the lower portion of the image toward the out-coupler.

Abstract: In example embodiments, a diffractive element is provided. The diffractive element may include a substrate. A plurality of grating elements are provided on the substrate. Each grating element includes a first ridge region comprising a first ridge body region and a first core element, a second ridge region comprising a second ridge body region and a second core element, and a saddle region extending between the first and second ridge regions. In some embodiments, the first ridge body, the second ridge body, and the saddle region have a first refractive index (n2), and the first core element and second core element have a second refractive index (n4) greater than the first refractive index.

Abstract: An eyewear apparatus is disclosed which comprises at least one light display engine (LDE) configured to generate at least one image on a display (disp1) of said light display engine, a waveguide (WG) configured for guiding light from the light display engine towards an eye of a user to make said image (Im1) visible to the user, wherein said display (disp1) is shifted (d) on one side with respect to an optical axis of said light display engine such that said image (Im1) is visible to the user on a corresponding side of a field of view (HFoV) of said eyewear apparatus.

Abstract: The disclosure relates to an image sensor comprising pixels for acquiring color information from incoming visible light, wherein said image sensor comprising at least two pixels being partially covered by a color splitter structure comprising a first part and a second part, each of said first and second parts being adjacent to a dielectric part, each of said dielectric part having a first refractive index n1 (said first part having a second refractive index n2, and said second part having a third refractive index n3, wherein n1<n3<n2, and wherein according to a cross section, the first part of said color splitter structure has a first width W1, a height H and the second part of said color splitter structure has a second width W2, and the same height H, and wherein said color splitter structure has a first, a second and a third edges at the interfaces between parts having different refractive indexes, each edge generating beams or nanojets, and wherein said height H is close to a value Formul (I), where

Abstract: A diffraction grating includes a plurality of grating unit cells positioned in a periodic array on a substrate surface. In cross-section, a grating unit cell includes a homogeneous dielectric host medium with a first refractive index n1, embedding at least a first block of a first dielectric material with a second refractive index n2, a side edge of which is in direct contact with at least a second block of a second dielectric material with a third refractive index n3. Both the first block and the second block have a trapezoidal cross-section. The plurality of grating unit cells provides a non-symmetrical response for positive first diffraction order and negative first diffraction order based on nanojet hot spot positions, the nanojets being generated at edges between dielectric materials with different refractive indexes.

Abstract: An example optical device includes a first waveguide (WG1) having a first diffractive in-coupler and a second waveguide (WG2) having a second diffractive in-coupler. The first diffractive in-coupler is configured to couple into the first waveguide (WG1) a first angular range ([?ThetaCWG1, ?ThetaGWG1]) and a non-overlapping second angular range ([ThetaGWG1, ThetaCWG1]) of incident light. At least a portion of the incident light that is not coupled into the first waveguide (WG1) is transmitted to the second diffractive in-coupler. The second diffractive in-coupler is configured to couple a third angular range ([?ThetaGWG1?ThetaCWG1]) of the incident light, where the third angular range includes angles between the first angular range and the second angular range. Embodiments of the optical device may include an image generator for use in a display device.

Abstract: The present disclosure concerns an image sensor comprising a set of pixels, wherein each pixel of the set comprises a first and a second element, the first element comprising a photodiode module unit, and the second element being an element for filtering color and focusing incident light into said first element. The image sensor further comprises at least two consecutive pixels from the set of pixels, for which first elements are put side by side, and wherein the image sensor comprises a gap between second elements of said at least two consecutive pixels.

Abstract: An optical device forming an outgoing electromagnetic wave from an incident electromagnetic wave comprises at least one unit cell (UC), comprising: at least two subwavelength optical elements (1, 2), each of them belonging to a different set (MSI, MS2) of subwavelength optical elements, a set of subwavelength optical elements being characterized by a type of optical response to an incident electromagnetic wave; means (21) enabling selective excitation of all subwavelength optical elements belonging to a given set, in response to an electromagnetic wave (20) incident on said unit cell.

Abstract: An optical device and an eyewear apparatus comprising the optical device are disclosed. The optical device comprises a diffraction grating configured to diffract an incident light of a given wavelength on said optical device, said diffraction grating having a grating pitch above said given wavelength and being configured to diffract said incident light at a diffraction order having an absolute value equal to or greater than 2, wherein the optical device comprises an optical waveguide configured for guiding said light diffracted at a diffraction order having an absolute value equal to or greater than 2. The diffraction grating comprises a substrate of a first dielectric material with refractive index n3 and at least one second dielectric material with refractive index n2 deposited on said substrate, where n3<n2 or n3=n2.

Abstract: A device configured for radiating a focused electromagnetic beam is proposed. Such device comprises: —a first (101) and a second (102) part having respectively a second n2 and third n3 refractive index and a first W1 and second W2; —a first contact area (100e1) intended to be between a host medium having a first refractive index n1 and in which the micro or nanoparticles are intended to be trapped or moved by a focused electromagnetic beam radiated by the device; —a second contact area (100e2) between the first part and the second part; and —a third contact area (100e3) intended to be between the second part and the host medium. The focused electromagnetic beam results from a combination of at least two beams among a first (NJ1), a second (NJ2) and a third (NJ3) jet beams radiated respectively by the first, second and third contact areas when an incoming electromagnetic wave (IEM) illuminates the device.