Lower Exciton Number Strong Light Matter Interaction in Plasmonic Tweezers
Yun-Fei Zou1,2 and Li Yu1,2*
1School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China 2State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
Abstract：The plasmonic nanocavity is an excellent platform for the study of light matter interaction within a sub-diffraction volume under ambient conditions. We design a structure of plasmonic tweezers, which can trap molecular J-aggregates and also serve as a plasmonic cavity with which to investigate strong light matter interaction. The optical response of the cavity is calculated via finite-difference time-domain methods, and the optical force is evaluated based on the Maxwell stress tensor method. With the help of the coupled oscillator model and virtual exciton theory, we investigate the strong coupling progress at the lower level of excitons, finding that a Rabi splitting of 230 meV can be obtained in a single exciton system. We further analyze the relationship between optical force and model volume in the coupling system. The proposed method offers a way to locate molecular J-aggregates in plasmonic tweezers for investigating optical force performance and strong light matter interaction.
Li B W, Zu S, Zhang Z P, Zheng L H, Jiang Q, Du B W, Luo Y, Gong Y J, Zhang Y F, Lin F, Shen B, Zhu X, Ajayan P M and Fang Z Y 2019 Opto-Electron. Adv.2 190008
2021, Vol. 38 
