Signature of a Fano Resonance in a Plasmonic Metamolecule's Local Density of Optical States
Signature of a Fano Resonance in a Plasmonic Metamolecule's Local Density of Optical States
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DOI：
10.1103/physrevlett.108.077404
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发表时间：
2012-02-17
影响因子：
8.6
通讯作者：
Koenderink, A. Femius
中科院分区：
文献类型：
--
作者：
Frimmer, Martin;Coenen, Toon;Koenderink, A. Femius
我们目前的测量等离子体超分子的局部激发下，使用阴极发光显示在相同的频率下，一个尖锐的光谱Fano功能消光的光学状态的局部密度的空间再分布。我们的分析模型表明，近场和远场效应的出现，由于相同的两个本征模式的系统的干扰。我们提出了定量的见解，无论是在裸态，并在一个修饰状态的图片，描述法诺干涉耦合裸态之间的近场振幅转移，或在远场的非耦合本征模的干扰。我们确定了相同的本征模引起的消光下降，强烈增强光学态的辐射局部密度，使其成为一个有前途的候选人的自发辐射控制。
We present measurements on plasmonic metamolecules under local excitation using cathodoluminescence which show a spatial redistribution of the local density of optical states at the same frequency where a sharp spectral Fano feature in extinction has been observed. Our analytical model shows that both near- and far-field effects arise due to interference of the same two eigenmodes of the system. We present quantitative insights both in a bare state, and in a dressed state picture that describe Fano interference either as near- field amplitude transfer between coupled bare states, or as interference of uncoupled eigenmodes in the far field. We identify the same eigenmode causing a dip in extinction to strongly enhance the radiative local density of optical states, making it a promising candidate for spontaneous emission control.