An effective nonlinear optical coefficient optimization method for langasite group solid solution crystals is disclosed. The langasite group crystal A.sub.3BC.sub.3D.sub.2O.sub.14 mainly includes langanite (LGN) crystal, langatate (LGT) crystal and langasite (LGS) crystal. The solid solution crystals are formed by adjusting a component proportion of langasite group crystals with the same structure, so that different ions mix and occupy sites in a polyhedral group, and a polyhedral lattice structure, distortion degree, refractive index and refractive dispersion of the solid solution crystal are changed. The reduction of the phase matching angle and the improvement of the nonlinear optical coefficient are realized, and the effective nonlinear optical coefficient is finally optimized.

A metasurface optical device includes a substrate, an optical medium layer disposed on the substrate, a plurality of nanoholes disposed in the optical medium layer, and a reflective layer covering sidewalls of the plurality of nanoholes. The plurality of nanoholes penetrate the optical medium layer and extend to the substrate.

A metasurface optical device includes a substrate and a nano-structure layer disposed on the substrate. The nano-structure layer includes a plurality of nano-structure units. The plurality of nano-structure units extend in a direction away from the substrate, and central axes of the plurality of nano-structure units form corresponding angles with respect to a normal direction of the substrate, such that the plurality of nano-structure units are arranged obliquely relative to the substrate.

A metasurface optical device includes a substrate and a nano-structure layer disposed on the substrate. The nano-structure layer includes a plurality of composite nano units each including a plurality of nano-structure units arranged on the substrate. Arrangement periods of the plurality of composite nano units are not completely same, and arrangement periods of the plurality of nano-structure units in one composite nano unit of the plurality of composite nano units are not completely same.

The present invention provides an infrared selective emitter in which since infrared energy can be emitted in a desired wavelength band by adjusting a metamaterial having a repeating structure on a plane, infrared camouflage is possible by attaching to the surface of the shape of an object to be camouflaged, and at the same time, the infrared selective emitter has flexible characteristics that can be applied to curved surfaces without limitations on the shape of an object.

Provided an imaging apparatus including a first optical device, a second optical device disposed such that light transmitted through the first optical device is incident on the second optical device, and a third optical device disposed such that light transmitted through the second optical device is incident on the third optical device, wherein at least one of the first optical device, the second optical device, and the third optical device includes a plurality of nanostructures, and heights of at least two nanostructures of the plurality of nanostructures are different from each other.

Systems and techniques are provided for meta-lens cameras. For example, an apparatus can include a first substrate including a first aperture and a second substrate including a first meta-lens. The first substrate and the second substrate are mechanically coupled such that at least a first portion of the first aperture is disposed over at least a second portion of the first meta-lens.

Disclosed herein are metasurfaces formed on a substrate from a plurality of posts. The metasurfaces are configured to be optically active at one or more wavelengths and in certain embodiments are configured to form lenses having unexpectedly strong focusing power. In particular, the metasurfaces are formed from “low-contrast” materials, including CMOS-compatible materials such as silicon dioxide or silicon nitride. Accordingly, the disclosed metasurfaces are generally CMOS compatible and therefore embody a new paradigm in metasurface design and manufacturing.

Disclosed herein is metasurface modules configured to reduce the cost of integration of metasurface elements within a housing and methods of manufacturing thereof. One particular embodiment includes a metasurface module including: a secondary substrate; and a metasurface chip mounted on the secondary substrate. The secondary substrate laterally extends from all sides of the metasurface chip to completely surround the metasurface chip. The secondary substrate may be utilized to mount the metasurface chip within a housing which decreases the size of the metasurface chip and ultimately decreases manufacturing costs of the metasurface chip.

A phase shifting device may include a plurality of metal layers and a plurality of first dielectric layers, a metal layer of the plurality of metal layers and a first dielectric layer of the plurality of first dielectric layers being alternately stacked in a first direction, and a second dielectric layer disposed on a side surface of the stacked structure in a second direction, wherein the first dielectric layer includes a first material having a first dielectric constant and the second dielectric layer includes a second material having a second dielectric constant, and wherein the second dielectric constant is greater than the first dielectric constant.