Journal
OPTICA
Volume 8, Issue 11, Pages 1416-1423Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPTICA.436140
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Funding
- Ministry of Education-Singapore [MOE2018-T2-1-176, MOE2018-T2-2-189(S)]
- Agency for Science, Technology and Research [1720700038, A1883c0002, A18A7b0058, A20E5c0095]
- National Research Foundation Singapore [NRF-CRP22-2019-0006, NRF-CRP23-2019-0007]
- Agencia Estatal de Investigacion [CEX2018-000805-M, PCI2018-093145, RTI2018-099737-B-I00]
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Strong light-matter interaction in 2D materials at the few-exciton level, characterized by fast coherent energy exchange between photons and excitons, is important for fundamental studies and quantum optical applications. This study demonstrates a strongly coupled gold dimer antenna with a sub-10 nm gap on a monolayer tungsten disulphide (WS2), showing a way to increase the number of excitons up to tenfold by varying the spatial mode overlap between the plasmonic field and the 2D material, with further tuning possible via plasmon-induced heating effects. These results represent progress towards quantum optical applications operating at room temperatures.
Strong light-matter interaction in 2D materials at the few-exciton level is important for both fundamental studies and quantum optical applications. Characterized by a fast coherent energy exchange between photons and excitons, strongly coupled plasmon-exciton systems in 2D materials have been reported with large Rabi splitting. However, large Rabi splitting at the few-exciton level generally requires large optical fields in a highly confined mode volume, which are difficult to achieve for in-plane excitons in 2D materials. In this work, we present a study of a strongly coupled gold dimer antenna with a sub-10 nm gap on a monolayer tungsten disulphide (WS2), with an estimated number of excitons of 4.67 +/- 0.99. We demonstrate that varying the spatial mode overlap between the plasmonic field and the 2D material can result in up to a similar to tenfold increase in the number of excitons, a value that can be further actively tuned via plasmon-induced heating effects. The demonstrated results would represent a key step toward quantum optical applications operating at room temperatures. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
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