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

Clément Javerzac-Galy, Anshuman Kumar, Ryan D. Schilling, Nicolas Piro, Sina Khorasani, Matteo Barbone, Ilya Goykhman, Jacob B. Khurgin, Andrea C. Ferrari, Tobias J. Kippenberg*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

57 Scopus citations

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.

Original languageEnglish
Pages (from-to)3138-3146
Number of pages9
JournalNano Letters
Volume18
Issue number5
DOIs
StatePublished - 9 May 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018 American Chemical Society.

Keywords

  • 2D materials
  • electronic and optical properties
  • transition metal dichalcogenides
  • whispering gallery mode resonator
  • WSe

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