Dielectric Chiral Metasurfaces for Second‐Harmonic Generation with Strong Circular Dichroism,Annalen Der Physik

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Dielectric Chiral Metasurfaces for Second‐Harmonic Generation with Strong Circular Dichroism
Annalen Der Physik ( IF 2.2 ) Pub Date : 2020-06-08 , DOI: 10.1002/andp.202000078
Kwang‐Hyon Kim ₁ , Ju‐Ryong Kim ₁

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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.

中文翻译：

具有强圆二色性的二次谐波产生的介电手性超颖表面

当介电手性超表面被金属基底支撑时，它们可以产生高效率和强圆二色性（CD）的谐波。数值结果表明，在蓝色-UV中，峰值泵浦强度约为5 GW cm ^-2时，二次谐波产生（SHG）效率约为10 ^-3％，而SHG CD可以达到约1.8，由金基底支撑的Z形铌酸锂纳米天线阵列的超表面形成。高效且强圆形的二向色性非线性响应归因于与金属基板相邻的电介质手性纳米天线中的等离激元辅助局部场增强。

更新日期：2020-06-08

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