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arXiv 1607.07620physics.optics
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与分子激子强耦合引起的等离子体能隙共振的模式修正

Mode Modification of Plasmonic Gap Resonances induced by Strong Coupling with Molecular Excitons

Xingxing Chen, Yu-Hui Chen, Jian Qin, Ding Zhao, Boyang Ding, Richard J. Blaikie, Min Qiu

摘要:

等离子体腔可用于在纳米尺度下控制原子-光子耦合过程,因为它们在非常小的模体积中提供光学态的高密度。在这里,我们展示了强耦合的分子激子和等离子体共振(所谓的plexcitonic耦合)在膜耦合纳米立方体腔,这可以诱导深刻的和显着的光谱和空间修改的等离子体间隙模式。在具有3 nm宽间隙的纳米管-膜腔中的单个间隙模式的光谱跨度内,窄带J聚集染料分子的引入不仅能够在光谱响应中实现抗交叉行为,而且还将单个空间模式分裂成容易通过其远场散射轮廓识别的两个不同模式。仿真结果证实了实验结果和plexcitonic耦合的灵敏度进行了探讨,使用数字控制的间隙间距。我们的工作为研究强耦合过程开辟了一个新的视角,极大地扩展了纳米光子系统的功能,具有在腔量子电动力学系统中应用的潜力。

英文摘要:

Plasmonic cavities can be used to control the atom-photon coupling process at the nanoscale, since they provide ultrahigh density of optical states in an exceptionally small mode volume. Here we demonstrate strong coupling between molecular excitons and plasmonic resonances (so-called plexcitonic coupling) in a film-coupled nanocube cavity, which can induce profound and significant spectral and spatial modifications to the plasmonic gap modes. Within the spectral span of a single gap mode in the nanotube-film cavity with a 3-nm wide gap, the introduction of narrow-band J-aggregate dye molecules not only enables an anti-crossing behavior in the spectral response, but also splits the single spatial mode into two distinct modes that are easily identified by their far-field scattering profiles. Simulation results confirm the experimental findings and the sensitivity of the plexcitonic coupling is explored using digital control of the gap spacing. Our work opens up a new perspective to study the strong coupling process, greatly extending the functionality of nanophotonic systems, with the potential to be applied in cavity quantum electrodynamic systems.

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