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Multiplexing-oriented nonlinear plasmon-assisted MoS$_2$ metasurfaces driven by the quasi bound states in the continuum | | Qun Ren
; Tong Wang
; Xiang Yao
; Quan Xu
; Zhihao Lan
; Jianwei You
; Xiaofei Xiao
; Wei E. I. Sha
; Ming Xin
; | | Date: |
26 Aug 2020 | | Abstract: | Rapid progress in nanofabrication techniques has enabled many novel optical
characteristics for metasurfaces. However, the research of nonlinear plasmonic
metasurfaces is still rather superficial, due to the lack of a clear physical
picture to depict their working mechanisms. Here we provide a comprehensive
theoretical study on the properties of nonlinear plasmon-assisted MoS$_2$
hybrid metasurfaces that originate from the bound states in the continuum
(BICs), from the perspective of both classical and quantum approaches. New
mechanisms to identify and create the trapped resonances that fueled by BICs
are elaborated. By exploiting the sharp resonances of light-capturing modes, we
demonstrate that the optical nonlinearity can be significantly boosted and
smartly tuned. Utilizing both the plasmon-polariton resonance and plasmonic
quasi-BICs, ultra-high nonlinear susceptibilities at different wavelength
windows can be obtained at the same time. This wavelength-multiplexed nonlinear
metasurfaces have many potential applications in frequency metrology, timing
characterization, quantum information, etc, where multiple color signals need
to be nonlinearly processed simultaneously. This work will also raise deeper
exploration and lead new directions for experimental plasmonic BICs. | | Source: | arXiv, 2008.11357 | | Services: | Forum | Review | PDF | Favorites | |
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