Nonlinear Strong Coupling by Second‐Harmonic Generation Enhancement in Plasmonic Nanopatch Antennas
Nonlinear Strong Coupling by Second‐Harmonic Generation Enhancement in Plasmonic Nanopatch Antennas
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DOI：
10.1002/adom.202200510
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发表时间：
2022-05
影响因子：
9
通讯作者：
B. Krause;Dhananjay Mishra;Jiyang Chen;C. Argyropoulos;T. Hoang
中科院分区：
文献类型：
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作者：
B. Krause;Dhananjay Mishra;Jiyang Chen;C. Argyropoulos;T. Hoang
等离子体纳米腔模体内增强的电磁场可以产生多种显著的效应，从而在线性和非线性光学系统中都能得到应用。在这项工作中，证明了增强二次谐波产生(SHG)的单个等离子体纳米晶片天线(NPA)，形成的银纳米立方体与光滑的金膜使用亚10 nm氧化锌隔离层。当NPA以其等离子体激元基频被激发时，观察到倍频波的强度增加了104倍。此外，通过积分在基频具有吸收能量的量子发射体，观察到了拉比分裂能为19 meV的二阶非线性激子-极化子强耦合响应。因此，利用NPA的非线性频率变换为弱耦合和强耦合条件下的光−物质相互作用的非线性控制提供了一个很好的平台，在光学工程和信息处理方面具有巨大的应用潜力。
Enhanced electromagnetic fields within plasmonic nanocavity mode volumes enable multiple significant effects that lead to applications in both the linear and nonlinear optical regimes. In this work, enhanced second‐harmonic generation (SHG) is demonstrated from individual plasmonic nanopatch antennas (NPAs) which are formed by separating silver nanocubes from a smooth gold film using a sub‐10 nm zinc oxide spacer layer. When the NPAs are excited at their fundamental plasmon frequency, a 104‐fold increase in the intensity of the SHG wave is observed. Moreover, by integrating quantum emitters that have an absorption energy at the fundamental frequency, a second‐order nonlinear exciton–polariton strong coupling response is observed with a Rabi splitting energy of 19 meV. The nonlinear frequency conversion using NPAs thus provides an excellent platform for nonlinear control of the light−matter interactions in both weak and strong coupling regimes which will have a great potential for applications in optical engineering and information processing.