Construction Method of Double-file Rectangular Grating Based on Metasurface

Abstract

The invention relates to a construction method of a double-gear rectangular grating based on a metasurface. The construction method comprises the following steps of: constructing a nano-brick structure unit; constructing a double-gear rectangular grating, wherein the double-gear rectangular grating comprises a plurality of nano brick structure units, linearly polarized light is vertically incidentinto a nano-brick structure array and passes through an analyzer to obtain a cosine function relationship among the emergent light intensity of the incident ray polarized light passing through the nano-brick structure units and the analyzer, the polarization direction [alpha]1 of the incident ray polarized light, a nano-brick steering angle [theta] and the polarization analysis direction [alpha]2of the analyzer, wherein the inclined angle of the polarization direction of the linearly polarized light and an x axis is [alpha]1, and the inclined angle of the polarization analysis direction of the analyzer and the x axis is [alpha]2; and a rectangular grating capable of achieving two grating periods is obtained by selecting the proper polarization direction [alpha]1 of the incident ray polarized light, the nano-brick steering angle [theta] and the polarization analysis direction [alpha]2 of the analyzer. According to the double-gear rectangular grating prepared by the method, two gratingperiods can be achieved at the same time, different measurement precision and ranges are generated, and different light splitting and spectral measurement capabilities are achieved.

Description

technical field [0001] The invention relates to the technical field of micro-nano optics, in particular to a method for constructing a metasurface-based double-shift rectangular grating and a double-shift rectangular grating. Background technique [0002] Diffraction gratings that modulate the amplitude of incident light waves are called amplitude-type gratings, also known as black-and-white gratings. As a commonly used amplitude type grating, the rectangular grating is composed of a large number of slits on a transparent substrate, and is widely used in spectroscopic, diffraction measurement and other fields. The modulation of the amplitude of the incident light wave by this kind of grating is changed according to the rectangular function. The modulation of the amplitude of the light has two states of high transparency and low transparency. Each of the two states appears once to form a grating period. The size of the grating period directly determines the diffraction measur...

AI Technical Summary

Problems solved by technology

The grating period is large, the measurement accuracy is low, and the measurement range is large; the grating period is small, the measurement accuracy is high, and the measurement range is small

At present, a single grating cannot satisfy high precision and large range at the same time, and it is difficult to produce high-quality rectangular gratings by drawing slits, and the cost is not low enough to reproduce in batches

Images