Nonlinear response regulation and control method based on continuous domain bound state of super-structure surface

Abstract

The invention discloses a regulation and control method based on super-structure surface continuous domain bound state nonlinear response. The regulation and control method comprises the following steps: 1, calculating physical parameters of artificial nonlinear response generated by BICs theoretically; 2, based on the obtained physical parameters influencing the nonlinear response, comparing and analyzing simulation results of the super-structure surface to the nonlinear response in two excitation modes of direct excitation and indirect excitation of BICs; 3, designing, processing and testing the nonlinear super-structure surface. According to the method, the metasurface is used as a theoretical design platform, finite element analysis software is used as calculation support, optical band near-field detection is used as a representation tool, the theoretical mechanism of efficient and artificial nonlinear response of the BICs and the regulation and control influence of all physical parameters of the metasurface on the nonlinear BICs are explored, the physical mechanism and the working mechanism contained in the artificial nonlinear BICs are revealed, full-manual, efficient and adjustable nonlinear response is achieved, and the industrial application requirements of nonlinear optical devices are met.

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...

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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

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