Multi-channel vector holographic polarization multiplexing method based on birefringent medium metasurface

Abstract

The invention discloses a multi-channel vector holographic polarization multiplexing method based on a birefringent medium metasurface, and belongs to the technical field of micro-nano optics and holographic multiplexing application. The method comprises the following steps that: the metasurface for achieving the holographic polarization multiplexing is composed of nano column arrays with rectangular cross sections and different geometric dimensions and different azimuth angles; by changing the geometric size and azimuth angles of the nano column unit, the phase and polarization state of the emergent light beam are randomly regulated and controlled by the metasurface; holograms corresponding to different mutually independent original images are obtained by using a GS algorithm; according to the obtained holograms, the geometric size and azimuth angles of the nano column unit are determined by coding so as to generate a processing file of a corresponding medium metasurface structure; the metasurface of the transmission-type medium is processed by adopting a micro-nano processing process of electron beam etching; through the selection of the polarization states of the incident lightbeam and emergent light beam, the combination and multiplexing of seven different polarization images of twelve different polarization channels are achieved.

Description

technical field [0001] The invention relates to a multi-channel vector holographic polarization multiplexing method, in particular to a multi-channel holographic polarization multiplexing method based on a metasurface of a birefringent medium, and belongs to the technical field of micro-nano optics and holographic multiplexing applications. Background technique [0002] Metasurfaces are usually composed of a single layer of subwavelength-sized metallic or dielectric nanoantenna arrays. Because of its ability to arbitrarily modulate the phase, amplitude and polarization of incident electromagnetic waves, it has attracted extensive attention from researchers. Traditional optical elements regulate the light field through the phase accumulation of light during propagation, while metasurfaces provide a new method to regulate the characteristics of the light field through the interaction of light and nanoantennas. By adjusting the geometry, size and spatial orientation of the nan...

AI Technical Summary

Problems solved by technology

However, in the above method, only the orthogonal polarization state is used to achieve dual channels. By changing the polarization state of the incident beam, only the conversion between two independent reconstructed images can be realized, and all the incident and exiting beams are not fully utilized. polarization channel

Therefore, the further improvement of the information capacity of the hologram is limited

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