Abstract: A communication method, applied to a master device, includes: determining, according to the number of controlled devices and a preset time slot length, detection cycles and detection timing of various controlled devices in a detection cycle; receiving, in a time slot in the detection cycle, an ultrasonic sweep signal sent by the controlled device; and determining, according to the detection timing and the ultrasonic sweep signal, a detection result of the master device and a controlled device.

Abstract: An electronic device such as a head-mounted device may have a display that displays computer-generated content for a user. The head-mounted device may have an optical system that directs the computer-generated content towards eye boxes for viewing by a user. The optical system may include a spatially addressable adjustable optical component. The adjustable optical component may have first and second electrodes and an electrically adjustable material between the first and second electrodes. The electrically adjustable material may include a transparent conductive material such as indium tin oxide that includes a pattern of segmented trenches configured to provide the transparent conductive material with electrical anisotropy. Contacts may be coupled to the transparent conductive material. Control circuitry can adjust the electrically adjustable material to form a spatially addressable light modulator or adjustable lens.

Abstract: Configurations for a beam deflector metasurface are disclosed. The beam deflector metasurface may include beam deflectors arranged in a repeating, radial pattern of concentric zones. The beam deflector metasurface may be a large area, high numerical aperture metasurface optic with high efficiency when directing light at non-normal angles of incidence. The different concentric zones may direct received light in varying directions with various steepness of angles. The beam deflectors may include pillars that may be the same or different width, height, or shape. The pillars may function as diffractive gratings and the cross-coupling between the pillars may direct the output light. The zones of the beam deflector metasurface may allow for diffusing hot spots and spreading the light evenly over the target area. The beam deflector metasurface may be used for non-imaging applications where the deterioration of focus allows for better efficiency at non-normal input and output angles of incidence.

Abstract: An electronic device such as a head-mounted device may have a display that displays computer-generated content for a user. The head-mounted device may have an optical system that directs the computer-generated content towards eye boxes for viewing by a user. The optical system may include a spatially addressable adjustable optical component. The adjustable optical component may have first and second electrodes and an electrically adjustable material between the first and second electrodes. The electrically adjustable material may include a transparent conductive material such as indium tin oxide that includes a pattern of segmented trenches configured to provide the transparent conductive material with electrical anisotropy. Contacts may be coupled to the transparent conductive material. Control circuitry can adjust the electrically adjustable material to form a spatially addressable light modulator or adjustable lens.

Abstract: An aluminized metallic scaffold for high temperature applications comprises a porous non-refractory alloy structure including a network of interconnected pores extending therethrough. The porous non-refractory alloy structure comprises a transition metal phase and an aluminide phase, and portions of the porous non-refractory alloy structure between interconnected pores have a thickness no greater than about 500 nm. A method of making an aluminized metallic scaffold for high-temperature applications comprises introducing aluminum into a surface of a porous metallic structure at an elevated temperature. The porous metallic structure comprises a transition metal and has a network of interconnected pores extending therethrough, where portions of the porous metallic structure between interconnected pores have a thickness no greater than about 500 nm.

Abstract: Non-disperse, periodic microplasmas are generated in a volume lacking interfering structures, such as electrodes, to enable photonic interaction between incident electromagnetic energy and the non-disperse, periodic microplasmas. Preferred embodiments leverage 1D, 2D, 3D and super 3D non-disperse, periodic microplasmas. In preferred embodiments, the non-disperse, periodic microplasmas are elongate columnar microplasmas. In other embodiments, the non-disperse, periodic microplasmas are discrete isolated microplasmas. The photonic properties can change by selectively activating groups of the periodic microplasmas.

Abstract: An aluminized metallic scaffold for high temperature applications comprises a porous non-refractory alloy structure including a network of interconnected pores extending therethrough. The porous non-refractory alloy structure comprises a transition metal phase and an aluminide phase, and portions of the porous non-refractory alloy structure between interconnected pores have a thickness no greater than about 500 nm. A method of making an aluminized metallic scaffold for high-temperature applications comprises introducing aluminum into a surface of a porous metallic structure at an elevated temperature. The porous metallic structure comprises a transition metal and has a network of interconnected pores extending therethrough, where portions of the porous metallic structure between interconnected pores have a thickness no greater than about 500 nm.