期刊
ACS PHOTONICS
卷 8, 期 11, 页码 3234-3240出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.1c01038
关键词
metasurface; bianisotropy; bound states in the continuum; second-harmonic generation
类别
资金
- Alexander von Humboldt Foundation
- Natural Sciences and Engineering Research Council of Canada
- Canada Research Chairs program
- Canada First Research Excellence Fund
- U.S. Army Research Office
- Office of Naval Research
- Natural Sciences and Engineering Research Council [RGPIN-2020-03989]
The study demonstrates highly asymmetric second-harmonic generation in bianisotropic AlGaAs metasurfaces, with the ability to increase the ratio of second-harmonic power for forward and backward illuminations by around four orders of magnitude. This paves the way towards directional generation of higher-order waves and potential applications in nonlinear holograms.
Bianisotropy is a powerful concept enabling asymmetric optical response, including asymmetric reflection, absorption, optical forces, light trapping, and lasing. The physical origin of these asymmetric effects can be understood from magnetoelectric coupling and asymmetrical field enhancement. Here, we theoretically propose highly asymmetric second-harmonic generation in bianisotropic AlGaAs metasurfaces. We show that the ratio of second-harmonic power for the forward and backward illuminations can be increased by around four orders of magnitude. This effect is obtained by altering geometrical parameters that coincide with quasi-bound states in the continuum. Our study paves the way toward a directional generation of higher-order waves and can be potentially useful for nonlinear holograms.
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