Cooperative Energy Transfer Controls the Spontaneous Emission Rate Beyond Field Enhancement Limits
Cooperative Energy Transfer Controls the Spontaneous Emission Rate Beyond Field Enhancement Limits
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DOI：
10.1103/physrevlett.122.203901
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发表时间：
2019-05-22
影响因子：
8.6
通讯作者：
Strangi, Giuseppe
中科院分区：
文献类型：
--
作者：
ElKabbash, Mohamed;Miele, Ermanno;Strangi, Giuseppe
位于金属纳米结构附近的量子发射器经由表面等离子体的近场激发单独地传递它们的能量。由于等离子体增强的局域场，能量转移过程增加了自发辐射（SE）率。在这里，我们证明了一个显着的加速量子发射器SE率在等离子体纳米腔由于合作能量转移（CET）从等离子体相关的发射器。使用一个集成的等离子体纳米腔，我们实现了高达六倍的增强耦合到相同的纳米腔顶部的局部态密度的等离子体增强的发射器的发射率。辐射功率谱保留了等离子体共振中心频率和线形，峰值振幅与激发发射体的数量成正比，表明所观察到的合作SE不同于超辐射。等离子体辅助的CET提供了对SE速率的前所未有的控制，并且允许我们在室温下动态地控制自发发射速率，这可以实现基于SE速率的光调制器。
Quantum emitters located in proximity to a metal nanostructure individually transfer their energy via near-field excitation of surface plasmons. The energy transfer process increases the spontaneous emission (SE) rate due to plasmon-enhanced local field. Here, we demonstrate a significant acceleration of the quantum emitter SE rate in a plasmonic nanocavity due to cooperative energy transfer (CET) from plasmon-correlated emitters. Using an integrated plasmonic nanocavity, we realize up to sixfold enhancement in the emission rate of emitters coupled to the same nanocavity on top of the plasmonic enhancement of the local density of states. The radiated power spectrum retains the plasmon resonance central frequency and line shape, with the peak amplitude proportional to the number of excited emitters indicating that the observed cooperative SE is distinct from superradiance. Plasmon-assisted CET offers unprecedented control over the SE rate and allows us to dynamically control the spontaneous emission rate at room temperature which can enable SE rate based optical modulators.