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arXiv · 2409.14742

Active control of excitonic strong coupling and electroluminescence in electrically driven plasmonic nanocavities

Junsheng Zheng·Ruoxue Yang·Alexey V. Krasavin·Zhenxin Wang·Yuanjia Feng·Longhua Tang·Linjun Li·Xin Guo·Daoxin Dai·Anatoly V. Zayats·Limin Tong·Pan Wang
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Abstract

Enhancement and active control of light-matter interactions at the atomic scale is important for developing next-generation nanophotonic and quantum optical devices. Here, we demonstrate electric control of both excitonic strong coupling and electroluminescence by integrating semiconductor monolayers into a nanometer gap of electrically driven nanocube-on-mirror plasmonic nanocavities. Particularly, in a strongly-coupled system of nanocavity plasmons and WSe2 excitons, the ultra-strong electric field generated in the nanocavity gap enables a reversible modulation of the Rabi splitting between ~102 and 80 meV with a bias below 2.5 V. In the quantum tunnelling regime, by injecting carriers into a nanocavity-integrated WS2 monolayer, bias-controlled spectrally tunable electroluminescence from charged or neutral excitons is achieved with an external quantum efficiency reaching ~3.5%. These results underline practical approaches to electric control of atomic-scale light-matter interactions for applications including nanoscale light sources, ultrafast electro-optic modulation, quantum information processing and sensing.

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Junsheng Zheng, Ruoxue Yang, Alexey V. Krasavin, Zhenxin Wang, Yuanjia Feng, Longhua Tang, Linjun Li, Xin Guo, Daoxin Dai, Anatoly V. Zayats, Limin Tong, Pan Wang. 2024-09-23. Active control of excitonic strong coupling and electroluminescence in electrically driven plasmonic nanocavities. https://doi.org/10.1126/sciadv.adt9808

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