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Vacuum Rabi splitting of a dark plasmonic cavity mode revealed by fast electrons

Author

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  • Ora Bitton

    (Chemical Research Support Department, Weizmann Institute of Science)

  • Satyendra Nath Gupta

    (Department of Chemical and Biological Physics, Weizmann Institute of Science)

  • Lothar Houben

    (Chemical Research Support Department, Weizmann Institute of Science)

  • Michal Kvapil

    (Central European Institute of Technology, Brno University of Technology
    Institute of Physical Engineering, Brno University of Technology)

  • Vlastimil Křápek

    (Central European Institute of Technology, Brno University of Technology)

  • Tomáš Šikola

    (Central European Institute of Technology, Brno University of Technology
    Institute of Physical Engineering, Brno University of Technology)

  • Gilad Haran

    (Department of Chemical and Biological Physics, Weizmann Institute of Science)

Abstract

Recent years have seen a growing interest in strong coupling between plasmons and excitons, as a way to generate new quantum optical testbeds and influence chemical dynamics and reactivity. Strong coupling to bright plasmonic modes has been achieved even with single quantum emitters. Dark plasmonic modes fare better in some applications due to longer lifetimes, but are difficult to probe as they are subradiant. Here, we apply electron energy loss (EEL) spectroscopy to demonstrate that a dark mode of an individual plasmonic bowtie can interact with a small number of quantum emitters, as evidenced by Rabi-split spectra. Coupling strengths of up to 85 meV place the bowtie-emitter devices at the onset of the strong coupling regime. Remarkably, the coupling occurs at the periphery of the bowtie gaps, even while the electron beam probes their center. Our findings pave the way for using EEL spectroscopy to study exciton-plasmon interactions involving non-emissive photonic modes.

Suggested Citation

  • Ora Bitton & Satyendra Nath Gupta & Lothar Houben & Michal Kvapil & Vlastimil Křápek & Tomáš Šikola & Gilad Haran, 2020. "Vacuum Rabi splitting of a dark plasmonic cavity mode revealed by fast electrons," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-14364-3
    DOI: 10.1038/s41467-020-14364-3
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    Cited by:

    1. Tingting Wu & Chongwu Wang & Guangwei Hu & Zhixun Wang & Jiaxin Zhao & Zhe Wang & Ksenia Chaykun & Lin Liu & Mengxiao Chen & Dong Li & Song Zhu & Qihua Xiong & Zexiang Shen & Huajian Gao & Francisco J, 2024. "Ultrastrong exciton-plasmon couplings in WS2 multilayers synthesized with a random multi-singular metasurface at room temperature," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    2. Carlos Maciel-Escudero & Andrew B. Yankovich & Battulga Munkhbat & Denis G. Baranov & Rainer Hillenbrand & Eva Olsson & Javier Aizpurua & Timur O. Shegai, 2023. "Probing optical anapoles with fast electron beams," Nature Communications, Nature, vol. 14(1), pages 1-11, December.

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