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Excitonic Emission of Monolayer Semiconductors Near-Field Coupled to High-Q Microresonators.

Published version
Peer-reviewed

Type

Article

Change log

Authors

Javerzac-Galy, Clément  ORCID logo  https://orcid.org/0000-0002-6816-1391
Kumar, Anshuman 
Schilling, Ryan D 
Piro, Nicolas 
Khorasani, Sina 

Abstract

We present quantum yield measurements of single layer WSe2 (1L-WSe2) integrated with high-Q ( Q > 106) optical microdisk cavities, using an efficient (η > 90%) near-field coupling scheme based on a tapered optical fiber. Coupling of the excitonic emission is achieved by placing 1L-WSe2 in the evanescent cavity field. This preserves the microresonator high intrinsic quality factor ( Q > 106) below the bandgap of 1L-WSe2. The cavity quantum yield is QYc ≈ 10-3, consistent with operation in the broad emitter regime (i.e., the emission lifetime of 1L-WSe2 is significantly shorter than the bare cavity decay time). This scheme can serve as a precise measurement tool for the excitonic emission of layered materials into cavity modes, for both in plane and out of plane excitation.

Description

Keywords

2D materials, WSe2, electronic and optical properties, transition metal dichalcogenides, whispering gallery mode resonator

Journal Title

Nano Lett

Conference Name

Journal ISSN

1530-6984
1530-6992

Volume Title

18

Publisher

American Chemical Society (ACS)
Sponsorship
Engineering and Physical Sciences Research Council (EP/G042357/1)
Royal Society (TG102524)
Engineering and Physical Sciences Research Council (EP/K01711X/1)
Engineering and Physical Sciences Research Council (EP/K017144/1)
European Commission (604391)
Engineering and Physical Sciences Research Council (EP/L016087/1)
European Commission Horizon 2020 (H2020) Future and Emerging Technologies (FET) (696656)
EPSRC (via University of Manchester) (R119256)
The Royal Society (wm090070)
European Research Council (319277)