Determining second-harmonic generation of nonlinear sandwich metasurface by nonlinear polarizability tensor method

Determining second-harmonic generation of nonlinear sandwich metasurface by nonlinear polarizability tensor method
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非线性极化张量法测定非线性夹层超表面的二次谐波产生

DOI:
10.1088/1361-6455/aba10d
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发表时间:
2020-07
期刊:
Journal of Physics B: Atomic, Molecular and Optical Physics
影响因子:
--
通讯作者:
Min Zhang
Min Zhang
中科院分区:
其他
文献类型:
--
作者:
Yan Deng;Li Zhang;Min Zhang

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提出了一种包含非线性极化率张量的解析方法,用于计算非线性夹层超颖表面的二次谐波强度。理论模型是一个非线性的元原子可以被认为是一个非线性的电和磁偶极子,这使得非线性极化率张量可以计算从散射的二次谐波的远场。结果表明,电磁等离子体共振的同时激发提高了倍频强度,这与时域有限差分法的结果在定量上是一致的。因此,可以设计各种非线性超颖表面用于非线性微纳光子器件。
We present an analytical method involving the nonlinear polarizability tensor for calculating the second harmonic generation (SHG) intensity for a nonlinear sandwich metasurface. The theoretical model is that a nonlinear meta-atom can be considered as a nonlinear electric- and magnetic-dipole, which allows the nonlinear polarizability tensors to be calculated from the far-field of the scattered SHG. The results suggest that the simultaneous excitation of electric and magnetic plasmonic resonances improves the SHG intensity, which is quantitatively consistent with the ones by the finite-difference time-domain method. Therefore, various nonlinear metasurfaces can be designed for applications in nonlinear micro-nano photonic devices.
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