CUED Publications database

Strong-coupling of WSe2 in ultra-compact plasmonic nanocavities at room temperature

Kleemann, M-E and Chikkaraddy, R and Alexeev, EM and Kos, D and Carnegie, C and Deacon, W and Pury, ACD and Grosse, C and Nijs, BD and Mertens, J and Tartakovskii, AI and Baumberg, JJ (2017) Strong-coupling of WSe2 in ultra-compact plasmonic nanocavities at room temperature. Nature Communications, 8.

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Strong-coupling of monolayer metal dichalcogenide semiconductors with light offers encouraging prospects for realistic exciton devices at room temperature. However, the nature of this coupling depends extremely sensitively on the optical confinement and the orientation of electronic dipoles and fields. Here, we show how plasmon strong coupling can be achieved in compact robust easily-assembled gold nano-gap resonators at room temperature. We prove that strong coupling is impossible with monolayers due to the large exciton coherence size, but resolve clear anti-crossings for greater than 7 layer devices with Rabi splittings exceeding 135 meV. We show that such structures improve on prospects for nonlinear exciton functionalities by at least 10$^{4}$, while retaining quantum efficiencies above 50%, and show evidence for superlinear light emission.

Item Type: Article
Uncontrolled Keywords: room temperature strong-coupling 2D materials TMDs plasmons polaritons plexcitons nanoparticle on mirror
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 18 Oct 2019 20:06
Last Modified: 10 Apr 2021 22:19
DOI: 10.1038/s41467-017-01398-3