Electrodynamic calculations of spontaneous emission coupled to metal nanostructures of arbitrary shape: nanoantenna-enhanced fluorescence
Electrodynamic calculations of spontaneous emission coupled to metal nanostructures of arbitrary shape: nanoantenna-enhanced fluorescence
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DOI：
10.1364/josab.26.001569
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发表时间：
2009-08
影响因子：
1.9
通讯作者：
V. Giannini;J. Sánchez-gil;O. Muskens;J. Rivas
中科院分区：
文献类型：
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作者：
V. Giannini;J. Sánchez-gil;O. Muskens;J. Rivas
我们提出了一个理论研究的自发辐射的光发射器接近的金属纳米结构的任意形状。相应的辐射和非辐射衰减率和由此产生的量子效率的修改，表示在局部等离子体激元模式密度的半经典偶极子模型的基础上，计算通过严格制定的绿色定理表面积分方程。金属损失和固有的非辐射衰减率的分子被适当地考虑，提出的关系有效的任意固有的量子产率一般。共振增强的荧光分子的辐射和非辐射衰减率时，观察到耦合到一个光学二聚体纳米天线。在改变偶极位置时，可以获得相对于非辐射对应物的辐射衰减速率的显著增强，从而导致内部量子效率的增加。对于位于差距中的发射体，量子效率从1%的固有值提高到~75%是可能的。
We present a theoretical study of the spontaneous emission of an optical emitter close to a metal nanostructure of arbitrary shape. The modification of the corresponding radiative and nonradiative decay rates and resulting quantum efficiencies, expressed on the basis of a semiclassical dipole model in terms of the local plasmonic mode density, is calculated by means of the rigorous formulation of the Green's theorem surface integral equations. Metal losses and the intrinsic nonradiative decay rate of the molecules are properly considered, presenting relationships valid in general for arbitrary intrinsic quantum yields. Resonant enhancement of the radiative and nonradiative decay rates of a fluorescent molecule is observed when coupled to an optical dimer nanoantenna. Upon varying the dipole position, it is possible to obtain a predominant enhancement of radiative decay rates over the nonradiative counterpart, resulting in an increase of the internal quantum efficiency. For emitters positioned in the gap, quantum efficiency enhancements from an intrinsic value of 1% to ~75% are possible.