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

Marie-Elena Kleemann, Rohit Chikkaraddy, Evgeny M. Alexeev, Dean Kos, Cloudy Carnegie, Will Deacon, Alex Casalis Pury, Christoph Große, Bart Nijs, Jan Mertens, Alexander I. Tartakovskii and Jeremy J. Baumberg ()
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Marie-Elena Kleemann: NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge
Rohit Chikkaraddy: NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge
Evgeny M. Alexeev: University of Sheffield
Dean Kos: NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge
Cloudy Carnegie: NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge
Will Deacon: NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge
Alex Casalis Pury: NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge
Christoph Große: NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge
Bart Nijs: NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge
Jan Mertens: NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge
Alexander I. Tartakovskii: University of Sheffield
Jeremy J. Baumberg: NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract 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, and 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 104, while retaining quantum efficiencies above 50%, and demonstrate evidence for superlinear light emission.

Date: 2017
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DOI: 10.1038/s41467-017-01398-3

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