Dielectric Chiral Metasurfaces for Second-Harmonic Generation with Strong Circular Dichroism |
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Authors: | Kwang-Hyon Kim Ju-Ryong Kim |
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Affiliation: | Institute of Physics, State Academy of Sciences, Unjong District, Pyongyang, PO Box 355 Democratic People's Republic of Korea |
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Abstract: | Dielectric chiral metasurfaces can generate harmonic waves with high efficiency and strong circular dichroism (CD), when they are supported by metallic substrates. Numerical results show that the second-harmonic generation (SHG) efficiency of about 10−3% for a peak pump intensity of about 5 GW cm−2 can be achieved in the blue-UV, and the SHG CD reaches up to about 1.8, from a metasurface of Z-shaped lithium niobate nanoantenna array supported by gold substrate. Highly efficient and strong circular dichroic nonlinear responses are attributed to the plasmon-assisted local field enhancement in the dielectric chiral nanoantennae adjacent to the metallic substrate. |
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Keywords: | circular dichroism circular polarization dielectric chiral metasurfaces Poincaré spheres second-harmonic generation |
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