Doubly-resonant enhanced second-harmonic generation and its wide-band tunability

被引:0
|
作者
Ji, Mingyi [1 ,2 ]
Qin, Zhaofu [3 ]
Chen, Hao [1 ,2 ]
Hu, Taozheng [1 ,2 ]
Chen, Zhuo [1 ,2 ]
Zhan, Peng [1 ,2 ]
机构
[1] Nanjing Univ, Sch Phys, Nanjing 210093, Peoples R China
[2] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
[3] Guangxi Minau Univ, Sch Math & Phys, Nanning 530006, Peoples R China
基金
中国国家自然科学基金;
关键词
Doubly-resonant condition; Second-harmonic generation; Plasmonic metasurfaces; LIGHT; SHAPE; SIZE;
D O I
10.1016/j.optcom.2023.129493
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
The second-harmonic generation (SHG) from the doubly-resonant metasurfaces composed of the U-shaped and the rectangular apertures on an optically opaque gold film is investigated theoretically. By engineering the fundamental plasmonic resonances of the composite metasurfaces to match the excitation and the second-harmonic wavelengths, respectively, the doubly-resonant enhanced SHG intensity of almost an order of magnitude is obtained, compared with the singly-resonant U-apertures. In addition, the satisfaction of doubly-resonant condition can be extended to a wide wavelength range by changing the refractive index of the surrounding medium, which benefits from the two fundamental plasmonic resonances oscillating at frequencies of a two-fold relationship. Our work provides a new way to enhance the efficiency of nonlinear harmonic generation.
引用
收藏
页数:5
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