Electrifying photonic metamaterials for tunable nonlinear optics

Lei Kang, Yonghao Cui, Shoufeng Lan, Sean P. Rodrigues, Mark L. Brongersma and Wenshan Cai ()
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Lei Kang: School of Materials Science and Engineering, Georgia Institute of Technology
Yonghao Cui: School of Materials Science and Engineering, Georgia Institute of Technology
Shoufeng Lan: School of Electrical and Computer Engineering, Georgia Institute of Technology
Sean P. Rodrigues: School of Materials Science and Engineering, Georgia Institute of Technology
Mark L. Brongersma: Geballe Laboratory for Advanced Materials, Stanford University
Wenshan Cai: School of Materials Science and Engineering, Georgia Institute of Technology

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract Metamaterials have not only enabled unprecedented flexibility in producing unconventional optical properties that are not found in nature, they have also provided exciting potential to create customized nonlinear media with high-order properties correlated to linear behaviour. Two particularly compelling directions are active metamaterials, whose optical properties can be purposely tailored by external stimuli in a reversible manner, and nonlinear metamaterials, which enable intensity-dependent frequency conversion of light waves. Here, by exploring the interaction of these two directions, we leverage the electrical and optical functions simultaneously supported in nanostructured metals and demonstrate electrically controlled nonlinear optical processes from a metamaterial. Both second harmonic generation and optical rectification, enhanced by the resonance behaviour in the metamaterial absorber, are modulated externally with applied voltage signals. Our results reveal an opportunity to exploit optical metamaterials as self-contained, dynamic electro-optic systems with intrinsically embedded electrical functions and optical nonlinearities.

Date: 2014
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DOI: 10.1038/ncomms5680

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