Intensity-dependent modulation of optically active signals in a chiral metamaterial

Sean P. Rodrigues, Shoufeng Lan, Lei Kang, Yonghao Cui, Patrick W. Panuski, Shengxiang Wang, Augustine M. Urbas and Wenshan Cai ()
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Sean P. Rodrigues: School of Electrical and Computer Engineering, Georgia Institute of Technology
Shoufeng Lan: School of Electrical and Computer Engineering, Georgia Institute of Technology
Lei Kang: School of Materials Science and Engineering, Georgia Institute of Technology
Yonghao Cui: School of Materials Science and Engineering, Georgia Institute of Technology
Patrick W. Panuski: School of Electrical and Computer Engineering, Georgia Institute of Technology
Shengxiang Wang: School of Electrical and Computer Engineering, Georgia Institute of Technology
Augustine M. Urbas: Air Force Research Laboratory, Wright-Patterson Air Force Base
Wenshan Cai: School of Electrical and Computer Engineering, Georgia Institute of Technology

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Chiral media exhibit optical phenomena that provide distinctive responses from opposite circular polarizations. The disparity between these responses can be optimized by structurally engineering absorptive materials into chiral nanopatterns to form metamaterials that provide gigantic chiroptical resonances. To fully leverage the innate duality of chiral metamaterials for future optical technologies, it is essential to make such chiroptical responses tunable via external means. Here we report an optical metamaterial with tailored chiroptical effects in the nonlinear regime, which exhibits a pronounced shift in its circular dichroism spectrum under a modest level of excitation power. Strong nonlinear optical rotation is observed at key spectral locations, with an intensity-induced change of 14° in the polarization rotation from a metamaterial thickness of less than λ/7. The modulation of chiroptical responses by manipulation of input powers incident on chiral metamaterials offers potential for active optics such as all-optical switching and light modulation.

Date: 2017
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DOI: 10.1038/ncomms14602

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