Limits to Strong Coupling of Excitons in Multilayer WS2 with Collective Plasmonic Resonances

TitleLimits to Strong Coupling of Excitons in Multilayer WS2 with Collective Plasmonic Resonances
Publication TypeJournal Article
Year of Publication2019
AuthorsS.J Wang, Q. Le-Van, F. Vaianella, B. Maes, E S. Barker, R.H Godiksen, A.G Curto, J Gomez Rivas
JournalACS Photonics
Volume6
Issue2
Pagination286-293
Type of ArticleLetter
Abstract

We demonstrate the strong coupling of direct transition excitons in tungsten disulfide (WS2) with collective plasmonic resonances at room temperature. We use open plasmonic cavities formed by periodic arrays of metallic nanoparticles. We show clear anti-crossings with monolayer, bilayer, and thicker multilayer WS2 on top of the nanoparticle array. The Rabi energy of such hybrid system varies from 50 to 100 meV from monolayers to 16 layers, respectively, while it does not scale with the square root of the number of layers as expected for collective strong coupling. We prove that out-of-plane coupling components can be disregarded because the normal field is screened due to the high refractive index contrast of the dielectric layers. Even though the in-plane dipole moments of the excitons decrease beyond monolayers, the strong in-plane field distributed in the flake can still enhance the coupling strength with multilayers. The achieved coherent coupling of TMD multilayers with open cavities could be exploited for manipulating the dynamics and transport of excitons in 2D semiconductors and developing ultrafast spin-valley tronic devices.

URLhttps://arxiv.org/abs/1808.08388
DOI10.1021/acsphotonics.8b01459
Division

MaSF

Department

PFE

PID

86cde80c42168846caa55d75c6cb6225

Alternate TitleACS Photonics
LabelArXiv

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