| Autor: |
Javerzac-Galy, Clément, Kumar, Anshuman, Schilling, Ryan D., Piro, Nicolas, Khorasani, Sina, Barbone, Matteo, Goykhman, Ilya, Khurgin, Jacob B., Ferrari, Andrea C., Kippenberg, Tobias J. |
| Rok vydání: |
2017 |
| Předmět: |
|
| Zdroj: |
Nano Letters 18 (5), 3138-3146 (2018) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1021/acs.nanolett.8b00749 |
| Popis: |
We present quantum yield measurements of single layer $\textrm{WSe}_2$ (1L-$\textrm{WSe}_2$) integrated with high-Q ($Q>10^6$) optical microdisk cavities, using an efficient ($\eta>$90%) near-field coupling scheme based on a tapered optical fiber. Coupling of the excitonic emission is achieved by placing 1L-WSe$_2$ to the evanescent cavity field. This preserves the microresonator high intrinsic quality factor ($Q>10^6$) below the bandgap of 1L-WSe$_2$. The nonlinear excitation power dependence of the cavity quantum yield is in agreement with an exciton-exciton annihilation model. The cavity quantum yield is $\textrm{QY}_\textrm{c}\sim10^{-3}$, consistent with operation in the \textit{broad emitter} regime (i.e. the emission lifetime of 1L-WSe$_2$ 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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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