All-Dielectric Meta-Surface for Multispectral Photography by Theta Modulation

Abstract

The traditional theta modulator encodes input information by superimposing Ronchi sub-gratings, which is extremely easy to cause spatial channel overlap that results in bands mixing. In this case, we present an all-dielectric theta modulation meta-surface with a new encoding method, which separates red, green, blue, and achromatic spatial channels on the focal plane. The meta-surface ensures that the positions of focal points are relatively consistent while focusing energy into the sub-wavelength regions. Our study offers a way to facilitate device miniaturization and system integration, which may have an important application in compact multispectral photography only with one detector.

Cross polarization conversion metasurface for fixed wireless and ku‐band applications

“…MMs properties can be utilized in its practical applications from microwave band (MHz) to optical regime (THz), leading toward new theories and corresponding applications. 7 Some of the important applications of MSs include unusual reflection and refraction of light, surface wave conversion, super lensing, invisible cloaks, quarter-and half wave plates, 8 planar lenses, 9 multi spectral photography, 10 and polarization controlling devices. [11][12][13] Metasurfaces can be used as a substrate or superstrate to enhance gain and bandwidth of micro strip patch antennas in microwave regime, such structures are reported in previous works.…”

Design and experimental analysis of dual-band polarization converting metasurface for microwave applications

“…The manipulation of the polarization of electromagnetic wave in the microwave-to-optical frequency range, has received a great attention, from researchers around the globe due to its diverse applications 1 , 2 . Applications of polarization manipulative metsurfaces includes, optical vertex converters 2 , optical metrology 3 , quarter 4 and half-wave plates 5 , polarimetry 6 , planar lenses 7 , GPR detection 8 , multi spectral photography 9 , biological sensing 10 and antennas 11 . Polarization can be manipulated either through conventional methods of using natural materials 12 or through artificially engineered materials.…”