Accessing the Exceptional Points in a Graphene Plasmon–Vibrational Mode Coupled System,ACS Photonics

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Accessing the Exceptional Points in a Graphene Plasmon–Vibrational Mode Coupled System
ACS Photonics ( IF 6.5 ) Pub Date : 2021-10-20 , DOI: 10.1021/acsphotonics.1c01083
Sang Hyun Park ₁ , Shengxuan Xia _{1,

2} , Sang-Hyun Oh ₁ , Phaedon Avouris _{1,

3} , Tony Low ₁

Affiliation

The coupling of plasmons and vibrational modes has been routinely observed in graphene and other 2D systems in both near-field and far-field spectroscopy. However, the relation between coupling strength and modal losses, and exceptional point physics has not been discussed. Here we apply a non-Hermitian framework to a model system of molecular layers on graphene and show that the transition point between strong and weak coupling regimes coincides with the exceptional point of non-Hermitian physics. We further show that the exceptional point can be conveniently located by changing the incident angle of the light and the graphene Fermi energy. Finally, we show that enhanced spectral sensitivity is obtained from small changes in molecular film thickness when the system is tuned to the exceptional point.

中文翻译：

访问石墨烯等离子体-振动模式耦合系统中的特殊点

在石墨烯和其他二维系统的近场和远场光谱中，经常观察到等离子体和振动模式的耦合。然而，耦合强度和模态损耗之间的关系以及特殊点物理尚未讨论。在这里，我们将非厄米框架应用于石墨烯上分子层的模型系统，并表明强弱耦合体系之间的转变点与非厄米物理学的例外点一致。我们进一步表明，可以通过改变光的入射角和石墨烯费米能量来方便地定位异常点。最后，我们表明，当系统调谐到异常点时，分子膜厚度的微小变化可以获得增强的光谱灵敏度。

更新日期：2021-11-17

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