Wavelength selection type super surface device

Abstract

The invention discloses a wavelength selection type super surface device and belongs to the metamaterial technical field. The wavelength selection type super surface device includes a substrate and a super surface which are successively arranged from bottom to top, wherein the super surface is composed of anisotropic nano unit structural arrays; the super surface includes a plurality of electromagnetic regions; the shapes and sizes of the nanostructures at the same electromagnetic region are identical; the shapes of the nanostructures at different electromagnetic regions are different or the shapes of the nanostructures at different electromagnetic regions are identical but the sizes of the nanostructures at the different electromagnetic regions are different; the nano structural array at each electromagnetic region only generates preset electromagnetic response to electromagnetic waves of specific wavelengths, so that wavelength selection can be realized. With the device of the invention adopted, incident light of different wavelengths can generate OAM (orbital angular momentum) of different topological charges. An ultrathin multi-wavelength optical device designed based on the wavelength selection type super surface device of the invention can be widely applied to wireless communication systems in the future.

Description

technical field [0001] The invention relates to the field of metamaterial research, in particular to a wavelength-selective metasurface device. Background technique [0002] With the development of communication technology, due to the limitations of conventional coding and channel technology, the capacity and spectral efficiency of traditional optical fiber systems are approaching the limit, which cannot meet the needs of transmitting large amounts of information. Not only that, but the security of the transmitted data is also facing challenges Serious challenges. In order to solve this problem, to further improve system capacity and spectrum efficiency, and to meet the increasing demand for data transmission in future mobile data services, it is necessary to explore revolutionary and innovative technologies. In recent years, the research on Orbital Angular Momentum (OAM) technology has attracted much attention. Due to its good orthogonality and the security of carrying inf...

AI Technical Summary

Problems solved by technology

Recently, as a new planar optical device, the two-dimensional material metasurface has been proved to be able to adjust the phase distribution by changing the shape and azimuth angle of its structural units. Various metasurfaces formed by arrays of unit structures The surface can generate OAM beams under the incidence of linearly polarized and circularly polarized light, but cannot be converted under the illumination of incident electromagnetic waves of different wavelengths

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