Hybrid KTP–Plasmonic Nanostructures for Enhanced Nonlinear Optics at the Nanoscale,ACS Photonics

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Hybrid KTP–Plasmonic Nanostructures for Enhanced Nonlinear Optics at the Nanoscale
ACS Photonics ( IF 6.5 ) Pub Date : 2020-03-02 , DOI: 10.1021/acsphotonics.9b01484
Nicolas Chauvet _{1,

2} , Maeliss Ethis de Corny ₁ , Mathieu Jeannin ₁ , Guillaume Laurent ₁ , Serge Huant ₁ , Thierry Gacoin ₃ , Géraldine Dantelle ₁ , Gilles Nogues ₁ , Guillaume Bachelier ₁

Affiliation

The search for miniaturized components for nonlinear optical processes needs a way to overcome the efficiency loss due to the effective size reduction of the active medium. Here we investigate a combination of a nanosized nonlinear dielectric crystal and metallic nanoantennas that benefits from both the intrinsic nonlinear conversion efficiency of the nonlinear medium and the local field enhancement of plasmonic resonances in metallic nanostructures. Careful comparison between experiments and numerical simulations reveals that the observed 10- to 1000-fold enhancement in second harmonic generation intensity in the hybrid structure relative to the isolated elements is attributed unequivocally to the field enhancement effect of plasmonic resonances on the nonlinear crystal for gold–crystal structures, while the enhancement observed in aluminum-based hybrid structures can be attributed to the linear dielectric effect on the plasmonic antennas.

中文翻译：

在纳米级增强非线性光学的混合KTP-等离子体纳米结构

寻找用于非线性光学过程的小型化组件需要一种方法来克服由于活性介质有效尺寸减小而导致的效率损失。在这里，我们研究了纳米尺寸的非线性介电晶体和金属纳米天线的组合，该组合既受益于非线性介质的固有非线性转换效率，又受益于金属纳米结构中等离子体共振的局部场增强。仔细比较实验和数值模拟后发现，相对于孤立的元素，在混合结构中观察到的二次谐波产生强度提高了10到1000倍，这无疑归因于等离子共振对金的非线性晶体的场增强作用。晶体结构

更新日期：2020-03-03

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