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Limits to strong coupling of excitons in multilayer WS2 with collective plasmonic resonances

Shaojun Wang, [missing] Quynh Le-Van, Fabio Vaianella, Bjorn Maes, Simone Eizagirre Barker, Rasmus H. Godiksen, Alberto Curto (UGent) and Jaime Gomez Rivas
(2019) ACS PHOTONICS. 6(2). p.286-293
Author
Organization
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 SO 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.
Keywords
ENERGY-TRANSFER, NANOSTRUCTURES, POLARITONS, DISPERSION, LATTICES, QUANTUM, ARRAYS, MOS2, light-matter interaction, exciton-polaritons, plasmonics, surface, lattice resonances, 2D semiconductors, transition-metal dichalcogenides

Citation

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MLA
Wang, Shaojun, et al. “Limits to Strong Coupling of Excitons in Multilayer WS2 with Collective Plasmonic Resonances.” ACS PHOTONICS, vol. 6, no. 2, 2019, pp. 286–93, doi:10.1021/acsphotonics.8b01459.
APA
Wang, S., Quynh Le-Van, [missing], Vaianella, F., Maes, B., Barker, S. E., Godiksen, R. H., … Rivas, J. G. (2019). Limits to strong coupling of excitons in multilayer WS2 with collective plasmonic resonances. ACS PHOTONICS, 6(2), 286–293. https://doi.org/10.1021/acsphotonics.8b01459
Chicago author-date
Wang, Shaojun, [missing] Quynh Le-Van, Fabio Vaianella, Bjorn Maes, Simone Eizagirre Barker, Rasmus H. Godiksen, Alberto Curto, and Jaime Gomez Rivas. 2019. “Limits to Strong Coupling of Excitons in Multilayer WS2 with Collective Plasmonic Resonances.” ACS PHOTONICS 6 (2): 286–93. https://doi.org/10.1021/acsphotonics.8b01459.
Chicago author-date (all authors)
Wang, Shaojun, [missing] Quynh Le-Van, Fabio Vaianella, Bjorn Maes, Simone Eizagirre Barker, Rasmus H. Godiksen, Alberto Curto, and Jaime Gomez Rivas. 2019. “Limits to Strong Coupling of Excitons in Multilayer WS2 with Collective Plasmonic Resonances.” ACS PHOTONICS 6 (2): 286–293. doi:10.1021/acsphotonics.8b01459.
Vancouver
1.
Wang S, Quynh Le-Van [missing], Vaianella F, Maes B, Barker SE, Godiksen RH, et al. Limits to strong coupling of excitons in multilayer WS2 with collective plasmonic resonances. ACS PHOTONICS. 2019;6(2):286–93.
IEEE
[1]
S. Wang et al., “Limits to strong coupling of excitons in multilayer WS2 with collective plasmonic resonances,” ACS PHOTONICS, vol. 6, no. 2, pp. 286–293, 2019.
@article{01GPPY48EKKB488BE5PN26NH0W,
  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 SO 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.}},
  author       = {{Wang, Shaojun and  Quynh Le-Van, [missing] and  Vaianella, Fabio and  Maes, Bjorn and  Barker, Simone Eizagirre and  Godiksen, Rasmus H. and Curto, Alberto and  Rivas, Jaime Gomez}},
  issn         = {{2330-4022}},
  journal      = {{ACS PHOTONICS}},
  keywords     = {{ENERGY-TRANSFER,NANOSTRUCTURES,POLARITONS,DISPERSION,LATTICES,QUANTUM,ARRAYS,MOS2,light-matter interaction,exciton-polaritons,plasmonics,surface,lattice resonances,2D semiconductors,transition-metal dichalcogenides}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{286--293}},
  title        = {{Limits to strong coupling of excitons in multilayer WS2 with collective plasmonic resonances}},
  url          = {{http://doi.org/10.1021/acsphotonics.8b01459}},
  volume       = {{6}},
  year         = {{2019}},
}
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