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

Autor: Javerzac-Galy C; Institute of Physics , École Polytechnique Fédérale de Lausanne (EPFL) , Lausanne CH-1015 , Switzerland., Kumar A; Institute of Physics , École Polytechnique Fédérale de Lausanne (EPFL) , Lausanne CH-1015 , Switzerland., Schilling RD; Institute of Physics , École Polytechnique Fédérale de Lausanne (EPFL) , Lausanne CH-1015 , Switzerland., Piro N; Institute of Physics , École Polytechnique Fédérale de Lausanne (EPFL) , Lausanne CH-1015 , Switzerland., Khorasani S; Vienna Center for Quantum Science and Technology (VCQ) , University of Vienna , 1090 Vienna , Austria., Barbone M; Cambridge Graphene Centre , University of Cambridge , Cambridge CB3 0FA , U.K., Goykhman I; Cambridge Graphene Centre , University of Cambridge , Cambridge CB3 0FA , U.K., Khurgin JB; Department of Electrical and Computer Engineering , Johns Hopkins University , Baltimore , Maryland 21218 , United States., Ferrari AC; Cambridge Graphene Centre , University of Cambridge , Cambridge CB3 0FA , U.K., Kippenberg TJ; Institute of Physics , École Polytechnique Fédérale de Lausanne (EPFL) , Lausanne CH-1015 , Switzerland.
Jazyk: angličtina
Zdroj: Nano letters [Nano Lett] 2018 May 09; Vol. 18 (5), pp. 3138-3146. Date of Electronic Publication: 2018 Apr 06.
DOI: 10.1021/acs.nanolett.8b00749
Abstrakt: We present quantum yield measurements of single layer WSe 2 (1L-WSe 2 ) integrated with high-Q ( Q > 10 6 ) 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-WSe 2 in the evanescent cavity field. This preserves the microresonator high intrinsic quality factor ( Q > 10 6 ) below the bandgap of 1L-WSe 2 . The cavity quantum yield is QY c ≈ 10 -3 , consistent with operation in the 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: MEDLINE
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