Broadband plasmonic chiral meta-mirrors

被引:1
作者
Whiting, Eric B. [1 ]
Kang, Lei [1 ]
Jenkins, Ronald P. [1 ]
Campbell, Sawyer D. [1 ]
Werner, Douglas H. [1 ]
机构
[1] Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USA
关键词
PHOTONIC METAMATERIAL; CIRCULAR-DICHROISM; OPTICAL-ACTIVITY; METASURFACES;
D O I
10.1364/OE.494714
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Chiral meta-mirrors provide a unique opportunity for achieving handedness-selective strong light-matter interaction at the nanometer scale. Importantly, the chiral resonances observed in chiral meta-mirrors arise from the spin-dependent resonant cavity which, however, is generally narrowband. In this paper, by exploiting a genetic algorithm (GA) based optimization method, we numerically validate a chiral meta-mirror with octave bandwidth. In particular, in the wavelength range from 1000 to 2000 nm, the proposed chiral meta-mirror strongly absorbs circularly polarized light of one handedness while highly reflecting the other. A field analysis indicates that the observed broadband chiroptical response can be attributed to the multiple chiral resonances supported by the optimized meta-mirror across the band of interest. The observed broadband chiral response confirms the potential of advanced inverse-design approaches for the creation of chiral metadevices with sophisticated functionalities. Based on the Lorentz reciprocity theorem, we show that the proposed meta-mirror can enable chiral-selective broadband second harmonic generation (SHG). Our study indicates that the application of advanced inverse-design approaches can greatly facilitate the development of metadevices with strong chiral response in both the linear and nonlinear regimes.& COPY; 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
引用
收藏
页码:22415 / 22423
页数:9
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