[NCTS Physics Research Highlights] Liang-Yan Hsu 'Anomalous Giant Superradiance in Molecular Aggregates Coupled to Polaritons', Phys. Rev. Lett. 133, 128001 (2024)

• 2024-10-04
• Chen, Jhan Yu 陳詹喻
• Chemical physics, physical chemistry, nanoscience and complex systems Interdisciplinary Research

Anomalous Giant Superradiance in Molecular Aggregates Coupled to Polaritons
分子聚集體與電磁極化子耦合時的異常巨大超輻射現象

Yi-Ting Chuang and Liang-Yan Hsu*
Phys. Rev. Lett. 133, 128001 (2024)
DOI: https://doi.org/10.1103/PhysRevLett.133.128001

Yi-Ting Chuang and Liang-Yan Hsu unveiled a new type of superradiance in molecules coupled to surface plasmon polaritons, whose collective light emission rate enhancement distinguishably surpasses the well-known Dick’s N scaling law. To explore this phenomenon, we derived a general analytical expression of the superradiance rate in any arbitrary dielectric media, revealing that the rate enhancement can be roughly divided into two factors: “dipole enhancement” and “spectral enhancement”. The former aligns with the classic mechanism of superradiance rate enhnacement in free space, while the latter is a new concept introduced in this study and accounts for the observed giant superradiance in dielectric media. Furthermore, we highlighted the crucial roles of intermolecular dipole-dipole interactions in this extraordinary superradiance enhancement.

許良彥博士與他的學生莊羿廷揭示了一種新型態的超輻射現象，該現象發生於分子聚集體與表面電漿子-電磁極化子偶合時，其集體放光速率的增強顯著超越了著名的「Dicke’s N 倍定律」。為了探究這一現象，我們推導出一個適用於任意介電環境中的超輻射速率解析表達式，揭示出超輻射速率的增強可以大致歸因於兩個因素：「偶極增強」和「譜增強」。前者與經典的真空中超輻射速率增強機制一致；而後者則是本研究中引入的新概念，它解釋了在介電環境中觀察到的巨大超輻射現象。此外，我們也強調了分子間偶極-偶極交互作用在這種異常超輻射增強中所扮演的關鍵角色。