Arbitrary shape grating simulation system based on ZEMAX

Abstract

The invention discloses an arbitrary shape grating simulation system based on ZEMAX. The system comprises a dynamic link library (DLL) interface, a calculation module, an acceleration method, a database module, a search module and an interpolation module, wherein the dynamic link library interface is used for embedding an algorithm into optical simulation software ZEMAX, so that the ZMEAX can calla self-defined grating model; a theoretical model adopts three-dimensional rigorous coupled wave analysis (RCWA) and is used for calculating diffraction characteristics of gratings in any shape undergiven parameters; the acceleration method uses the GPU acceleration principle, achieves rapid operation of RCWA through the powerful parallel operation capacity of a GPU, and the purpose of preliminarily accelerating an optimization algorithm; the database module is composed of a plurality of records, each record is marked by a diffraction parameter set, and diffraction characteristics under given parameters are recorded; the search module adopts a hash table method and is used for quickly searching for records corresponding to given parameters to realize further acceleration of a simulationalgorithm; and the interpolation module is used for calculating diffraction characteristics of non-recording parameters. The model can quickly calculate the diffraction characteristics of the gratingunder given parameters, and can be applied to ZEMAX to realize ray tracing imaging simulation.

Description

technical field [0001] The invention relates to a ZEMAX-based grating simulation system of arbitrary shape. Background technique [0002] Near-eye display technology, especially holographic waveguide display technology, has made great progress and has attracted 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. [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 arbitrary shapes. This method can achieve high-precision numerical simulation. However, COMSOL does not have a systematic geometric imaging optimization system, which is not suitable for the design of imaging systems. and optimization. Commonly used optical simulation software such as ZEMAX and TracePro can real...

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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 arbitrary shapes. This method can achieve high-precision numerical simulation. However, COMSOL does not have a systematic geometric imaging optimization system, which is not suitable for the design of imaging systems. and optimization

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 simple surface grating simulation, and lack the simulation model of arbitrary shape gratings

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