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

Shaojun Wang (Corresponding author), Q. Le Van, Fabio Vaianella, Bjorn Maes, S. Eizagirre Barker, Rasmus Hjelmgart Godiksen, Alberto G. Curto, Jaime Gómez Rivas (Corresponding author)

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2 Citaties (Scopus)

Uittreksel

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.
TaalEngels
Pagina's286–293
Aantal pagina's8
TijdschriftACS Photonics
Volume6
Nummer van het tijdschrift2
DOI's
StatusGepubliceerd - 3 feb 2019

Vingerafdruk

Excitons
Monolayers
Multilayers
excitons
Metal Nanoparticles
Nanoparticles
Refractometry
Semiconductors
Tungsten
Dipole moment
Electron transitions
Hybrid systems
Disulfides
Refractive index
nanoparticles
cavities
Semiconductor materials
flakes
disulfides
Equipment and Supplies

Trefwoorden

    Citeer dit

    @article{f464385e5f7244029067636180bf27cd,
    title = "Limits to strong coupling of excitons in multilayer WS2 with collective plasmonic resonances",
    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.",
    keywords = "2D semiconductors, exciton-polaritons, light-matter interaction, plasmonics, surface lattice resonances, transition-metal dichalcogenides",
    author = "Shaojun Wang and {Le Van}, Q. and Fabio Vaianella and Bjorn Maes and {Eizagirre Barker}, S. and {Hjelmgart Godiksen}, Rasmus and Curto, {Alberto G.} and {G{\'o}mez Rivas}, Jaime",
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    Limits to strong coupling of excitons in multilayer WS2 with collective plasmonic resonances. / Wang, Shaojun (Corresponding author); Le Van, Q.; Vaianella, Fabio; Maes, Bjorn; Eizagirre Barker, S.; Hjelmgart Godiksen, Rasmus; Curto, Alberto G.; Gómez Rivas, Jaime (Corresponding author).

    In: ACS Photonics, Vol. 6, Nr. 2, 03.02.2019, blz. 286–293.

    Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

    TY - JOUR

    T1 - Limits to strong coupling of excitons in multilayer WS2 with collective plasmonic resonances

    AU - Wang,Shaojun

    AU - Le Van,Q.

    AU - Vaianella,Fabio

    AU - Maes,Bjorn

    AU - Eizagirre Barker,S.

    AU - Hjelmgart Godiksen,Rasmus

    AU - Curto,Alberto G.

    AU - Gómez Rivas,Jaime

    PY - 2019/2/3

    Y1 - 2019/2/3

    N2 - 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.

    AB - 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.

    KW - 2D semiconductors

    KW - exciton-polaritons

    KW - light-matter interaction

    KW - plasmonics

    KW - surface lattice resonances

    KW - transition-metal dichalcogenides

    UR - https://arxiv.org/abs/1808.08388

    U2 - 10.1021/acsphotonics.8b01459

    DO - 10.1021/acsphotonics.8b01459

    M3 - Article

    VL - 6

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    JO - ACS Photonics

    T2 - ACS Photonics

    JF - ACS Photonics

    SN - 2330-4022

    IS - 2

    ER -

    Wang S, Le Van Q, Vaianella F, Maes B, Eizagirre Barker S, Hjelmgart Godiksen R et al. Limits to strong coupling of excitons in multilayer WS2 with collective plasmonic resonances. ACS Photonics. 2019 feb 3;6(2):286–293. Beschikbaar vanaf, DOI: 10.1021/acsphotonics.8b01459