A Nonlinear Response Regulation Method Based on Bound States of Continuous Domains on Metasurfaces

Abstract

The invention discloses a control method based on the nonlinear response of the bound state of the continuous domain of the metasurface, comprising the following steps: step 1, theoretically calculating the physical parameters of the artificial nonlinear response generated by BICs; step 2, based on the obtained parameters that affect the nonlinear response For physical parameters, compare and analyze the simulation results of the nonlinear response of the metasurface from the two excitation methods of direct excitation and indirect excitation BICs; step 3, design, processing and testing of the nonlinear metasurface. The present invention takes the metasurface as the theoretical design platform, uses the finite element analysis software as the calculation support, and uses the optical band near-field detection as the characterization tool to explore the theoretical mechanism of BICs to achieve high-efficiency, artificial nonlinear response and the effect of various physical parameters of the metasurface on The regulatory influence of nonlinear BICs reveals the physical mechanism and working mechanism of artificial nonlinear BICs, realizes a fully artificial, efficient, and adjustable nonlinear response, and meets the industrial application requirements of nonlinear optical devices.

Description

technical field [0001] The invention relates to the field of nonlinear optics, in particular to a nonlinear response control method based on the bound state of the continuous domain of the metasurface. Background technique [0002] Nonlinear optics has important applications in channel multiplexing and signal synchronization due to its frequency tuning characteristics. Nonlinear optical communication devices can not only improve the efficiency of information transmission, but also greatly reduce communication costs. For a long time, researchers have been constantly exploring ways to improve the nonlinear conversion efficiency through methods such as local electric field enhancement, composite nonlinear materials, and phase matching. However, most nonlinear optical devices are constrained by intrinsic nonlinear polarizability, saturated absorption rate, dispersion and other factors, which cannot meet the needs of completely artificial design and efficient transformation of n...

AI Technical Summary

Problems solved by technology

However, this inherent nonlinearity brought about by thermal and mechanical effects has application limitations: the coupling efficiency of thermoelastic metasurfaces is low in open systems, which affects the high-efficiency conversion of nonlinear responses; the mechanical displacement of force-elastic metasurfaces Slower, delayed response time limits high-frequency band applications with nonlinear response

However, it is worth noting that, on the one hand, the excited electromagnetic response is affected by factors such as the inherent nonlinear polarizability and refractive index of the material, which is closely related to the material selection of the metasurface; on the other hand, due to absorption loss and other reasons , which greatly weakens the linear resonance mode, resulting in a greatly reduced conversion rate of nonlinear effects

Images