Contrast exciton-photon coupling of various excitons in WSe₂ (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Contrast exciton-photon coupling of various excitons in WSe₂

Caption

a, Schematic of the Ag NW-WSe2 sample structure. The inset shows the bright field microscopic image. b, Helicity-resolved PL spectra of monolayer WSe2 far away from Ag NW at 4 K under σ+ excitation at 685 nm. c, Simulated electromagnetic field (left) and normalized SPP power ξ (right) of out-of-plane dipoles coupled with NWs as a function of position, respectively. d, Simulated electromagnetic field (left) and normalized SPP power ξ (right) of in-plane dipoles coupled with NWs as a function of position, respectively. The out-of-plane dipole (dark excitons and dark trions) shows stronger coupling strength while the in-plane dipole (bright excitons and bright trions) demonstrates the directional coupling features.

Credit

by Zhe Li, Xin-Yuan Zhang, Rundong Ma, Tong Fu, Yan Zeng, Chong Hu, Yufeng Cheng, Cheng Wang, Yun Wang, Yuhua Feng, Takashi Taniguchi, Kenji Watanabe, Ti Wang, Xiaoze Liu, Hongxing Xu

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License

CC BY

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