Enhanced terahertz third-harmonic generation in graphene-metal metasurface with bound states in the continuum

被引：13

作者：

Wang, Baoku ^{[1
]}

Liu, Jing ^{[1
]}

Liu, Jialin ^{[1
]}

Liu, Jianlong ^{[1
]}

Liu, Jianqiang ^{[2
]}

Sun, Weimin ^{[1
]}

Li, Li ^{[1
,3
]}

机构：

[1] Harbin Engn Univ, Minist Educ, Key Lab Fiber Integrated Opt, Harbin 150001, Peoples R China

[2] Jiujiang Univ, Sch Sci, Jiujiang 332005, Peoples R China

[3] Harbin Inst Technol, Sch Sci, Harbin 150080, Peoples R China

来源：

JOURNAL OF APPLIED PHYSICS | 2023年 / 133卷 / 02期

关键词：

2ND-HARMONIC GENERATION; RESONANCES;

D O I：

10.1063/5.0132059

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We propose a graphene-metal metasurface with bound states in the continuum (BICs) for the enhancement of terahertz (THz) thirdharmonic generation (THG). With the adjustment of graphene Fermi level, the parameter-tuned BICs produced by the graphene-metal metasurface can make the transition to distinct quasi-BICs. It enables strong confinement of the localized field in monolayer graphene. By exploiting the large third-order nonlinearity of graphene, the efficient THG process at the quasi-BICs can be boosted under low pump threshold. With the 50 kW/cm(2) of fundamental THz incidence, a THG conversion efficiency as high as similar to 3% is achievable at the quasi-BICs regime. This renders the BIC metasurfaces very attractive for THz nonlinear photonics.

引用

页数：7

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