Light-Emitting Plexciton: Exploiting Plasmon-Exciton Interaction in the Intermediate Coupling Regime

ACS Nano
Jiawei SunHongxing Xu

Abstract

The interaction between plasmons in metal nanostructures and excitons in layered materials attracts recent interests due to its fascinating properties inherited from the two constituents, e.g., the high tunability on its spectral or spatial properties from the plasmonic component, and the large optical nonlinearity or light emitting properties from the excitonic counterpart. Here, we demonstrate light-emitting plexcitons from the coupling between the neutral excitons in monolayer WSe2 and highly confined nanocavity plasmons in the nanocube-over-mirror system. We observe, simultaneously, an anticrossing dispersion curve of the hybrid system in the dark-field scattering spectrum and a 1700 times enhancement in the photoluminescence. We attribute the large photoluminescence enhancement to the increased local density of states by both the plasmonic and excitonic constituents in the intermediate coupling regime. In addition, increasing the confinement of the hybrid systems is achieved by shrinking down the size of the hot spot within the gap between the nanocube and the metal film. Numerical calculations reproduce the experimental observations and provide the effective number of excitons taking part in the interaction. This highly c...Continue Reading

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Citations

Aug 30, 2019·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Peng ZhengNianqiang Wu
Jan 10, 2020·The Journal of Chemical Physics·Jingyu WangJian-Feng Li
Sep 21, 2019·Biosensors & Bioelectronics·Yangyang ChenXiaohong Zhou
Apr 24, 2021·Advanced Materials·Jihye LeeJong-Souk Yeo
Jul 3, 2021·Nanomaterials·Konthoujam James SinghHao-Chung Kuo
Jul 13, 2021·ACS Applied Materials & Interfaces·Wenjie HuiJunyong Kang
Jul 27, 2021·ACS Nano·Surendra B AnantharamanDeep Jariwala
Sep 2, 2021·ACS Applied Materials & Interfaces·Xiaobo HanPeixiang Lu
Jan 4, 2022·Nano Letters·Marko M PetrićJonathan J Finley

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