The metal nanoarray can couple the excitation light energy to the surface, resulting in local electromagnetic field enhancement due to the resonance effect. This is beneficial to the generation of nonlinear optical processes which depend on electromagnetic resonance enhancement, taking advantage of the field enhancement properties of metal nanoarray. Here, silver nanoperiodic arrays are integrated with AgInS₂ quantum dots (QDs) to enhance the second harmonic generation (SHG) process of QDs. The experimental results show that the enhancement factor of SHG is 8.8-fold in the condition of surface plasmon resonance. In contrast, the second harmonic emission from pure quantum dots is very weak. The simulation reveals that the second harmonic enhancement is caused by the resonance between the incident laser and the Ag nanoarray. The experimental results show that it is feasible to generate a highly efficient nonlinear optical process of QDs assisted by metal nanoarray. This is beneficial for extending the nonlinear applications of quantum dots.

中文翻译：

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通过与银纳米阵列集成的量子点产生共振增强的二次谐波

金属纳米阵列可以将激发光能耦合到表面，由于共振效应导致局部电磁场增强。这有利于利用金属纳米阵列的场增强特性，产生依赖于电磁共振增强的非线性光学过程。在这里，银纳米周期阵列与 AgInS ₂集成量子点 (QD) 以增强 QD 的二次谐波产生 (SHG) 过程。实验结果表明，在表面等离子体共振条件下，SHG的增强因子为8.8倍。相比之下，纯量子点的二次谐波发射非常微弱。模拟表明，二次谐波增强是由入射激光和银纳米阵列之间的共振引起的。实验结果表明，在金属纳米阵列的辅助下产生高效的量子点非线性光学过程是可行的。这有利于扩展量子点的非线性应用。