In:
Nanophotonics, Walter de Gruyter GmbH, Vol. 9, No. 8 ( 2020-07-09), p. 2351-2359
Abstract:
Strong quantum confinement and coulomb interactions induce tightly bound quasiparticles such as excitons and trions in an atomically thin layer of transitional metal dichalcogenides (TMDs), which play a dominant role in determining their intriguing optoelectronic properties. Thus, controlling the excitonic properties is essential for the applications of TMD-based devices. Here, we demonstrate the all-optical tuning of the local excitonic emission from a monolayer MoS 2 hybridized with phase-change material Ge 2 Sb 2 Te 5 (GST) thin film. By applying pulsed laser with different power on the MoS 2 /GST heterostructure, the peak energies of the excitonic emission of MoS 2 can be tuned up to 40 meV, and the exciton/trion intensity ratio can be tuned by at least one order of magnitude. Raman spectra and transient pump-probe measurements show that the tunability originated from the laser-induced phase change of the GST thin film with charge transferring from GST to the monolayer MoS 2 . The dynamic tuning of the excitonic emission was all done with localized laser pulses and could be scaled readily, which pave a new way of controlling the excitonic emission in TMDs. Our findings could be potentially used as all-optical modulators or switches in future optical networks.
Type of Medium:
Online Resource
ISSN:
2192-8614
,
2192-8606
DOI:
10.1515/nanoph-2019-0366
Language:
English
Publisher:
Walter de Gruyter GmbH
Publication Date:
2020
detail.hit.zdb_id:
2674162-3
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