RCWA-based polarizer grating diffracted ray tracing simulation system and RCWA-based polarizer grating diffracted ray tracing simulation method

Abstract

The invention discloses a polarizer grating (PVG) diffracted ray tracing simulation system and method based on RCWA. According to the invention, the RCWA analysis theory is utilized, the anisotropic periodic grating structure is expanded into Fourier series, the diffraction characteristic of the incident light is solved by utilizing the boundary condition, and then the Monte Carlo method is combined to optimize the light tracing algorithm, so that the simulation precision and the operation speed are improved. The model can quickly calculate the diffraction characteristics of the grating undergiven parameters, including diffraction order, propagation direction, diffraction efficiency and polarization state analysis, has good portability, and can be applied to commercial optical simulationsoftware ZEMAX through a dynamic link library (DLL) to achieve ray tracing simulation.

Description

technical field [0001] The invention relates to an RCWA-based polarization body grating diffraction ray tracing simulation system and method, belonging to the technical field of optical communication. Background technique [0002] In recent years, near-eye display technology has received a lot of attention from the market, among which the holographic waveguide display technology applied to augmented reality (AR) has made great progress and has gained widespread attention at home and abroad. To achieve high-performance slim designs, diffractive optical elements (DOEs), represented by gratings, have been widely adopted and studied as coupling elements for waveguide near-eye displays. In recent years, relevant researchers have proposed a polarizing volume grating (PVG), such as figure 1 As shown, the grating has two-dimensional anisotropic periodicity by periodically rotating the liquid crystal molecules along the two-dimensional direction, which retains the efficient single-o...

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Problems solved by technology

[0003] At present, research institutions at home and abroad use the finite element method of COMSOL Multiphysics to simulate the diffraction characteristics of gratings with complex structures. This method can achieve high-precision numerical simulation. However, COMSOL A geometric imaging optimization system without a system is not suitable for the design and optimization of imaging systems

Commonly used optical simulation software such as Zemax and TracePro can realize the design, analysis, optimization and other auxiliary functions of optical imaging systems, but only support the simulation of simple surface gratings and volume gratings, and lack the simulation model of polarization volume gratings

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