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Title: Monolayer tungsten disulfide in photonic environment : angle-resolved weak and strong light-matter coupling
Authors: Zhang, Xuewen
Wu, Lishu
Wang, Xu
He, Silin
Hu, Hanwei
Shi, Guangchao
Zhang, Xingwang
Shang, Jingzhi
Yu, Ting
Keywords: Science::Physics::Optics and light
Science::Physics::Atomic physics::Solid state physics
Issue Date: 2022
Source: Zhang, X., Wu, L., Wang, X., He, S., Hu, H., Shi, G., Zhang, X., Shang, J. & Yu, T. (2022). Monolayer tungsten disulfide in photonic environment : angle-resolved weak and strong light-matter coupling. Nano Research.
Project: NRF-CRP-21-2018-0007
Journal: Nano Research
Abstract: Light-matter interactions in two-dimensional transition metal dichalcogenides (TMDs) are sensitive to the surrounding dielectric environment. Depending on the interacting strength, weak and strong exciton-photon coupling effects can occur when the exciton energy is resonant with the one of photon. Here we report angle-resolved spectroscopic signatures of monolayer tungsten disulfide (1L-WS2) in weak and strong exciton-photon coupling environments. Inherent optical response of 1L-WS2 in the momentum space is uncovered by employing a dielectric mirror as substrate, where the energy dispersion is angle-independent while the amplitudes increase at high detection angles. When 1L-WS2 sits on top of a dielectric layer on silicon, the resonant trapped photon weakly couples with the exciton, in which the minimum of reflection dip shifts at both sides of the crossing angle while the emitted exciton energy remains unchanged. The unusual shift of reflection dip is attributed to the presence of Fano resonance under white-light illumination. By embedding 1L-WS2 into a dielectric microcavity, strong exciton-photon coupling results in the formation of lower and upper polariton branches with an appreciable Rabi splitting of 34 meV at room temperature, where the observed blueshift of the lower polariton branch is indicative of the enhanced polariton-polariton scattering. Our findings highlight the effect of dielectric environment on angle-resolved optical response of exciton-photon interactions in a two-dimensional semiconductor, which is helpful to develop practical TMD-based architectures for photonic and polaritonic applications. [Figure not available: see fulltext.]
ISSN: 1998-0124
DOI: 10.1007/s12274-022-4143-7
Rights: © 2022 Tsinghua University Press. All rights reserved. This paper was published in Nano Research and is made available with permission of Tsinghua University Press
Fulltext Permission: embargo_20230323
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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