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Strong Exciton–Plasmon Coupling in a WS2 Monolayer on Au Film Hybrid Structures Mediated by Liquid Ga Nanoparticles
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2020-03-05 , DOI: 10.1002/lpor.201900420 Fu Deng 1, 2 , Hongfeng Liu 1 , Lei Xu 2 , Sheng Lan 1 , Andrey E. Miroshnichenko 2
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2020-03-05 , DOI: 10.1002/lpor.201900420 Fu Deng 1, 2 , Hongfeng Liu 1 , Lei Xu 2 , Sheng Lan 1 , Andrey E. Miroshnichenko 2
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Realizing and manipulating strong light–matter coupling in 2D monolayer semiconductors is of paramount importance in the development of novel photonic devices. Here, it is revealed by numerical simulation that strong coupling between the excitons in a WS2 monolayer and the surface plasmon polaritons propagating on the surface of a thin Au film can be realized when the surface plasmon polaritons are generated via the Kretschmann–Raether configuration. The use of liquid Ga nanoparticles, which exhibit broad scattering spectra in visible light, is proposed to identify the strong exciton–plasmon coupling. It is demonstrated numerically and experimentally that the exciton–plasmon coupling strength, which is manifested in Rabi splitting, can be further enhanced by the in‐plane localization of the electric field provided by liquid Ga nanoparticles. Anti‐crossing of the scattering spectra can be observed by tuning the angle of the incident light and Rabi splitting exceeding 120 meV can be obtained. The results open new horizons for realizing strong exciton‐plasmon coupling in hybrid structures composed of monolayer semiconductors and thin metal films and pave the way for the practical applications of strong light–matter interaction in nanoscale photonic devices.
中文翻译：
液态Ga纳米粒子介导的金膜杂化结构上WS2单层中的强激子-等离子体耦合。
在新型光子器件的开发中，实现和操纵2D单层半导体中的强光-质耦合至关重要。在此，通过数值模拟揭示了WS 2中激子之间的强耦合当通过Kretschmann–Raether构型产生表面等离激元极化子时，可以实现在金薄膜上传播的单层和表面等离激元极化子。提出了使用在可见光中具有宽散射光谱的液态Ga纳米颗粒来鉴定强激子-等离子体耦合的方法。数值和实验证明，通过液体Ga纳米粒子提供的电场在平面内的定位，可以进一步增强激子-等离子体耦合强度，这在拉比分裂中表现出来。可以通过调整入射光的角度来观察散射光谱的反交叉，并且可以获得超过120 meV的拉比分裂。
更新日期：2020-03-05
中文翻译：
液态Ga纳米粒子介导的金膜杂化结构上WS2单层中的强激子-等离子体耦合。
在新型光子器件的开发中，实现和操纵2D单层半导体中的强光-质耦合至关重要。在此，通过数值模拟揭示了WS 2中激子之间的强耦合当通过Kretschmann–Raether构型产生表面等离激元极化子时，可以实现在金薄膜上传播的单层和表面等离激元极化子。提出了使用在可见光中具有宽散射光谱的液态Ga纳米颗粒来鉴定强激子-等离子体耦合的方法。数值和实验证明，通过液体Ga纳米粒子提供的电场在平面内的定位，可以进一步增强激子-等离子体耦合强度，这在拉比分裂中表现出来。可以通过调整入射光的角度来观察散射光谱的反交叉，并且可以获得超过120 meV的拉比分裂。
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