Strong-coupling of WSe2 in ultra-compact plasmonic nanocavities at room temperature. Issue 1 (December 2017)

• Record Type: Journal Article
• Authors: Kleemann, Marie-Elena; Chikkaraddy, Rohit; Alexeev, Evgeny; Kos, Dean; Carnegie, Cloudy; Deacon, Will; Pury, Alex; Große, Christoph; Nijs, Bart; Mertens, Jan; Tartakovskii, Alexander; Baumberg, Jeremy
• Is Part Of: Nature communications. Volume 8:Issue 1(2017)
• Page Start: 1
• Page End: 7
• Publication Date: 2017-12
• Subjects: Biology -- Periodicals; Physical sciences -- Periodicals; 505
• DOI: 10.1038/s41467-017-01398-3
• Languages: English
• ISSNs: 2041-1723

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. Two-dimensional materials offer the prospect of excitonic devices operating at room-temperature. Here, Kleemann et al. demonstrate that by tuning the number of WSe2 layers in a nanoparticle-on-mirror geometry, room-temperature plasmon strong-coupling can be achieved with large Rabi splittings.