Highly Efficient Single-Exciton Strong Coupling with Plasmons by Lowering Critical Interaction Strength at an Exceptional Point,Physical Review Letters

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Highly Efficient Single-Exciton Strong Coupling with Plasmons by Lowering Critical Interaction Strength at an Exceptional Point
Physical Review Letters ( IF 8.1 ) Pub Date : 2023-04-05 , DOI: 10.1103/physrevlett.130.143601
Wei Li _{1,

2} , Renming Liu ₃ , Junyu Li ₁ , Jie Zhong ₁ , Yu-Wei Lu ₁ , Huanjun Chen ₂ , Xue-Hua Wang ₁

Affiliation

The single-exciton strong coupling with the localized plasmon mode (LPM) at room temperature is highly desirable for exploiting quantum technology. However, its realization has been a very low probability event due to the harsh critical conditions, severely compromising its application. Here, we present a highly efficient approach for achieving such a strong coupling by reducing the critical interaction strength at the exceptional point based upon the damping inhibition and matching of the coupled system, instead of enhancing the coupling strength to overcome the system’s large damping. Experimentally, we compress the LPM’s damping linewidth from about 45 nm to about 14 nm using a leaky Fabry–Perot cavity, a good match to the excitonic linewidth of about 10 nm. This method dramatically relaxes the harsh requirement in mode volume by more than an order of magnitude and allows a maximum direction angle of the exciton dipole relative to the mode field of up to around 71.9°, significantly improving the success rate of achieving the single-exciton strong coupling with LPMs from about 1% to about 80%.

中文翻译：

通过降低异常点的临界相互作用强度实现与等离子体的高效单激子强耦合

在室温下单激子与局域等离子体模式 (LPM) 的强耦合对于开发量子技术来说是非常理想的。然而，由于苛刻的临界条件，其实现一直是极低概率事件，严重影响了其应用。在这里，我们提出了一种通过基于耦合系统的阻尼抑制和匹配来降低异常点处的临界相互作用强度来实现这种强耦合的高效方法，而不是通过增强耦合强度来克服系统的大阻尼。在实验上，我们使用泄漏的法布里-珀罗腔将 LPM 的阻尼线宽从约 45 nm 压缩到约 14 nm，这与约 10 nm 的激子线宽非常匹配。

更新日期：2023-04-05

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