Metamaterials can be designed to exhibit extraordinarily strong chiral responses. Here we present a chiral metamaterial that produces both distinguishable linear and nonlinear features in the visible to near-infrared range. In additional to the gigantic chiral effects in the linear regime, the metamaterial demonstrates a pronounced contrast between second harmonic responses from the two circular polarizations. Linear and nonlinear images probed with circularly polarized lights show strongly defined contrast. Moreover, the chiral centers of the nanometallic structures with enhanced hotspots can be purposely opened for direct access, where emitters occupying the light-confining regions produce chiral-selective enhancement of two-photon luminescence.
Wenshan Cai, "Chiral-selective nonlinear optical generation and emission control with plasmonic metamaterials
(Conference Presentation)," Proc. SPIE 9920, Active Photonic Materials VIII, 99200V (Presented at SPIE Nanoscience + Engineering: August 30, 2016; Published: 9 November 2016); https://doi.org/10.1117/12.2237989.5159519633001.
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