A display device of the present disclosure includes, along an optical path of imaging light emitted from an imaging light generation device, a first optical portion having a positive power, a second optical portion including a first diffraction element and having a positive power, a third optical portion having a positive power, and a fourth optical portion including a second diffraction element and having a positive power. In the optical path, the first diffraction element and the second diffraction element diffract the imaging light at least along a primary diffraction plane and a secondary diffraction plane orthogonal to the primary diffraction plane, and a deflection force of the imaging light in the primary diffraction plane is greater than a deflection force of the imaging light in the secondary diffraction plane.

Provided are meta-surface optical device and methods of manufacturing the same. The meta-surface optical device may include a meta-surface arranged on a region of a substrate and a light control member arranged around the meta-surface. The light control member may be arranged on or below the substrate. A material layer formed of the same material used to form the meta-surface may be disposed between the light control member and the substrate. Also, the meta-surface may be a first meta-surface arranged on an upper surface of the substrate, and a second meta-surface may be arranged on a bottom surface of the substrate. Also, the meta-surface may include a first meta-surface and at least one second meta-surface may formed on the first meta-surface, and the light control member may be arranged around the at least one second meta-surface.

A phase-adjusting element configured to provide substantially liquid-invariant extended depth of field for an associated optical lens. One example of a lens incorporating the phase-adjusting element includes the lens having surface with a modulated relief defining a plurality of regions including a first region and a second region, the first region having a depth relative to the second region, and a plurality of nanostructures formed in the first region. The depth of the first region and a spacing between adjacent nanostructures of the plurality of nanostructures is selected to provide a selected average index of refraction of the first region, and the spacing between adjacent nanostructures of the plurality of nanostructures is sufficiently small that the first region does not substantially diffract visible light.

An optical processor is presented for applying optical processing to a light field passing through a predetermined imaging lens unit. The optical processor comprises a pattern in the form of spaced apart regions of different optical properties. The pattern is configured to define a phase coder, and a dispersion profile coder. The phase coder affects profiles of Through Focus Modulation Transfer Function (TFMTF) for different wavelength components of the light field in accordance with a predetermined profile of an extended depth of focusing to be obtained by the imaging lens unit. The dispersion profile coder is to configured in accordance with the imaging lens unit and the predetermined profile of the extended depth of focusing to provide a predetermined overlapping between said TFMTF profiles within said predetermined profile of the extended depth of focusing.

A multi-image display apparatus includes a light source configured to emit a first wavelength light, a second wavelength light, and a third wavelength light, a spatial light modulator configured to modulate the first wavelength light, the second wavelength light, and the third wavelength light to form a first image including a first color holographic image, a second color holographic image, and a third color holographic image, a polarization selective lens configured to focus the first image having only a first polarization component and transmit a second image having only a second polarization component without refraction, the second image being provided to the polarization selective lens along a different path from the first image, wherein chromatic aberration of the polarization selective lens is offset by adjusting a depth of the first color holographic image, the second color holographic image, and the third color holographic image.

A light field imaging device may include a diffraction grating assembly configured to receive an optical wavefront from a scene and including one or more diffraction gratings. Each diffraction grating has a refractive index modulation pattern with a grating period along a grating axis and is configured to generate a diffracted wavefront. The device may also include a pixel array configured to detect the diffracted wavefront in a near-field region. The pixel array includes light-sensitive pixels and a pixel pitch along the grating axis that is equal to or larger than the grating period. Each pixel samples a portion of the diffracted wavefront and generates a pixel response. The pixels include groups or pairs of adjacent pixels, where the adjacent pixels in each group or pair have different pixel responses as a function of the angle of incidence of the optical wavefront. Light field imaging methods are also disclosed.

Provided is a focusing device that includes a substrate and a plurality of scatterers provided at both sides of the substrate. The scatterers on the both sides of the focusing device may correct geometric aberration, and thus, a field of view (FOV) of the focusing device may be widened.

Provided are ophthalmic lens and a technique related thereto, the ophthalmic lens having a prescription frequency of zero or less, a diffraction structure for which a blaze wavelength is set on the short wavelength side of visible light being provided on at least one of an object-side surface side and an eyeball-side surface side, and the ophthalmic lens having positive longitudinal chromatic aberration.

Provided is a display method for displaying an image based on a color original image. The display method includes guiding an image light corresponding to the color original image to a display position by an optical system, and deflecting a traveling direction of the image light to an observer and performing display by a diffraction optical element. At the time of displaying the color original image, the image light entering the first diffraction optical element includes a light entering at a first angle and a light entering at a second angle that is larger than the first angle, a chromaticity range of the image of the color original image at a position corresponding to the light entering at the first angle is limited to be close to a chromaticity range of the light entering at the second angle.

Aspect ratio modifying imaging systems and methods are provided. In one example, an infrared imaging device includes at least one lens element configured to transmit electromagnetic radiation associated with a portion of a scene. The portion has a first aspect ratio. The electromagnetic radiation includes mid-wave and/or long-wave infrared light. The at least one lens element has a freeform surface having no translational symmetry and no rotational symmetry. The infrared imaging device further includes a detector array configured to receive image data associated with the electromagnetic radiation from the at least one lens element and generate, based on the image data, an image. The image data has a second aspect ratio different from the first aspect ratio. Each of the first and second aspect ratios is a ratio of a size along a first direction and a size along a second direction orthogonal to the first direction.