Efficient second harmonic generation at quasi-bound states in the continuum in hybrid nanostructures of 2D plasmonic array and waveguide

被引:0
|
作者
Liu, Di
Huo, Yanyan
Ren, Yingying [1 ,2 ]
Cai, Yangjian
Ning, Tingyin [1 ,2 ]
机构
[1] Shandong Normal Univ, Shandong Prov Engn & Tech Ctr Light Manipulat, Sch Phys & Elect, Jinan 250358, Peoples R China
[2] Shandong Normal Univ, Sch Phys & Elect, Shandong Prov Key Lab Opt & Photon Device, Jinan 250358, Peoples R China
关键词
Bound states in the continuum; Second harmonic generation; Hybrid plasmonic-photonic structures; ENHANCEMENT;
D O I
10.1016/j.rinp.2023.106923
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We numerically investigate the second harmonic generation (SHG) in hybrid plasmonic-photonic structures consisting of an array of periodic gold nanodisks covered by a nonlinear dielectric layer. In the designed hybrid systems, symmetry-protected bound states in the continuum (BICs) at normal incidence, and Friedrich- Wintgen BICs due to the coupling between localized surface plasmon resonances (LSPRs) and waveguide modes at oblique incidence, are observed under both transverse-electric (TE) and transverse-magnetic (TM) polarized illuminations. SHG near the BICs is studied, and the dramatically enhanced nonlinear optical response at quasi-BICs is obtained. Such enhancement is ascribed to the enhanced local field due to hybrid modes of LSPRs and photonic modes. The results indicate that hybrid plasmonic-dielectric systems supporting BICs at both TE-and TM-polarized incidences are promising platforms for linear and nonlinear photonic devices.
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页数:8
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