Tunable metal grating polarizer with high extinction ratio

Abstract

The invention relates to a tunable metal grating polarizer with high extinction ratio, and the tunable metal grating polarizer comprises upper and lower independent opposite metal grating polarizers with same structural parameters, wherein stretchable materials are fixed between the upper metal grating polarizer and the lower metal grating polarizer, and an upper grating surface and a lower grating surface are kept parallel; the stretchable materials are driven at different driving voltages; and the distance between the two metal grating polarizers is the distance of the intermediate stretchable material corresponding to the lengths of different stretchable materials. With the structure, the metal grating polarizer disclosed by the invention can obtain both very high extinction ratio Ex and light transmission rate TTM, is tunable in central wavelength and can be tunable within an integral visible light waveband. According to the structure, only two wire gating polarizers with the same parameters are overlapped, and easiness for manufacture and realization and very high practicability are achieved.

Description

technical field [0001] The invention relates to a metal grating polarizer, in particular to a metal grating polarizer with tunable high extinction ratio. Background technique [0002] Polarization devices are one of the earliest and most widely used devices in optical devices. Usually, devices that generate polarized light include polarizing prisms, dielectric film structures, dichroic polarizers, and the like. Metal grating polarizer is a new type of polarizing device based on micro-nano structure. Compared with traditional polarizing devices, it has the advantages of small size, thin film, easy integration and high performance. Therefore, it has been widely used in optical fiber communication, liquid crystal display, optical projection, Photoelectric detection and other fields. The usual manufacturing method is to plate a metal film on the surface of the substrate, then coat a layer of photoresist as a mask, use electron beam direct writing to form a grating structure on...

AI Technical Summary

Problems solved by technology

[0005] The present invention is aimed at the problem that it is difficult to achieve high extinction ratio and high transmittance at the same time with a single-layer metal grating, and proposes a metal grating polarizer with a tunable high extinction ratio, which adopts a double-layer metal grating structure, and simultaneously improves the extinction ratio Ex and Transmittance T TM , and then use the length-adjustable telescopic mechanism to effectively tune the central wavelength of the polarizing beam splitter, so as to meet the application requirements of different bands

Images