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Direct Observation of Self-Hybridized Exciton-Polaritons and Their Valley Polarizations in a Bare WS2 Layer

Authors
Shin, Dong-JinCho, HyunHeeSung, JunghyunGong, Su-Hyun
Issue Date
Dec-2022
Publisher
WILEY-V C H VERLAG GMBH
Keywords
exciton-polaritons; evanescent field coupling; strong exciton-photon coupling; transition metal dichalcogenides; valleytronics
Citation
ADVANCED MATERIALS, v.34, no.50
Indexed
SCIE
SCOPUS
Journal Title
ADVANCED MATERIALS
Volume
34
Number
50
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/147133
DOI
10.1002/adma.202207735
ISSN
0935-9648
1521-4095
Abstract
The strong excitonic properties of transition metal dichalcogenides (TMD) have led to the successful demonstration of exciton-polaritons (EPs) in various optical cavity structures. Recently, self-hybridized EPs have been discovered in a bare TMD layer, but experimental investigation is still lacking because of their nonradiative nature. Herein, the direct observation of self-hybridized EPs in a bare multilayer WS2 via the evanescent field coupling technique is reported. Because of the thickness-dependent Rabi splitting energy, the dispersion curves of the EPs change sensitively with sample thickness. Moreover, continuous tuning of EP dispersion curves is demonstrated by controlling the excitation laser power. Lastly, it is observed that guided EPs retain valley polarization up to 0.2 at room temperature, representing a valley-preserved strong coupling regime. It is believed that the high tunability and valley polarization properties of the guided EPs in bare TMD layers can facilitate new nanophotonic and valleytronic applications.
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