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 language | English |
---|---|
Pages (from-to) | 3138-3146 |
Number of pages | 9 |
Journal | Nano Letters |
Volume | 18 |
Issue number | 5 |
DOIs | |
State | Published - 9 May 2018 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2018 American Chemical Society.
Keywords
- 2D materials
- electronic and optical properties
- transition metal dichalcogenides
- whispering gallery mode resonator
- WSe