Abstract: A computer-implemented method may include (1) causing a radar component to emit one or more radar signals and (2) causing the radar component to analyze one or more return signals. Also disclosed is a method for forming a 3D liquid crystal polarization hologram optical element and a method for characterizing diffractive waveguides includes directing light onto a structure and measuring the diffracted light to capture at least one image of the structure. Lastly, disclosed is a method of pattering organic solid crystals and a method directing a beam of input light to a surface of an optical material to determine crystallographic and optical parameters of the optical material. Various other methods, systems, and computer-readable media are also disclosed.

Abstract: Embodiments of the present disclosure provide an etching method with a metal hard mask. The method is performed on a wafer surface and includes sequentially forming a metal hard mask layer and at least one functional film layer on a wafer surface in a direction away from the wafer surface. The method includes performing a plurality of etching processes on the at least one functional layer and the metal hard mask layer sequentially in a direction close to the wafer surface. An etching gas adopted by at least one etching process includes a hydrogen element and a fluorine element. A ratio of a content of the hydrogen element in the etching gas to a content of the fluorine element in the etching gas is smaller than a predetermined threshold to reduce generation of a byproduct of hydrogen fluorine.

Abstract: Embodiments of the present disclosure provide an etching method with a metal hard mask. The method is performed on a wafer surface and includes sequentially forming a metal hard mask layer and at least one functional film layer on a wafer surface in a direction away from the wafer surface. The method includes performing a plurality of etching processes on the at least one functional layer and the metal hard mask layer sequentially in a direction close to the wafer surface. An etching gas adopted by at least one etching process includes a hydrogen element and a fluorine element. A ratio of a content of the hydrogen element in the etching gas to a content of the fluorine element in the etching gas is smaller than a predetermined threshold to reduce generation of a byproduct of hydrogen fluorine.

Abstract: A far-field characteristic of light emitted by a micro light emitting diode (?LED) such as a beam shape, a beam orientation, a beam focusing, or a beam polarization is controlled by a metasurface of nanostructures formed on the ?LED. The metasurface is characterized or defined by a far-field objective function for the emitted light, selection of a nanostructure shape, and application of one or more fabrication constraints to shape parameters for the selected nanostructure shape. A number and a location of the nanostructures is determined employing an adjoint simulation technique, and the shape parameters for the nanostructure are tuned employing a shape optimization technique.

Abstract: An optical element includes a waveguide body that is configured to guide light by total internal reflection from an input end to an output end, an input coupling structure located at the input end for coupling light into the waveguide body, and an output coupling structure located at the output end for coupling light out of the waveguide body, where the waveguide body includes a layer of an optically anisotropic organic solid crystal. Such an optical element may have low weight and exhibit good color uniformity while presenting a 2D diagonal field-of-view of at least approximately 10°.

Abstract: A device includes an array of light sources configured to emit light beams, and a metasurface including a plurality of nanostructures and configured to receive and deflect the light beams emitted by the array of light sources. The metasurface includes a plurality of regions. Nanostructures in different regions of the plurality of regions are configured to deflect center light rays (with peak intensity) of the light beams into different directions towards a target, such as display optics of a near-eye display. In some embodiments, nanostructures in each region of the plurality of regions are configured to deflect center light rays of light beams of two or more different colors into a same direction or similar directions towards the target.