Journal
SMALL
Volume 13, Issue 42, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201701694
Keywords
chemical vapor deposition; MoS2; Purcell effect; refractive index sensing; whispering gallery mode
Categories
Funding
- Ministry of Science and Technology [2016YFA0200700, 2017YFA0205004]
- National Natural Science Foundation of China [21673054, 51290272, 51472008]
- Key Research Program of Frontier Science, CAS [QYZDB-SSW-SYS031]
- Peking University
- Chinese government
- open research fund program of the state key laboratory of low-dimensional quantum physics
- Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics [KF201601]
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Tuning the optical properties of 2D direct bandgap semiconductors is crucial for applications in photonic light source, optical communication, and sensing. In this work, the excitonic properties of molybdenum disulphide (MoS2) are successfully tuned by directly depositing it onto silica microsphere resonators using chemical vapor deposition method. Multiple whispering gallery mode (WGM) peaks in the emission wavelength range of approximate to 650-750 nm are observed under continuous wave excitation at room temperature. Time-resolved photoluminescence (TRPL) and femtosecond transient absorption (TA) spectroscopy are conducted to study light-matter interaction dynamics of the MoS2 microcavities. TRPL study suggests radiative recombination rate of carrier-phonon scattering and interband transition processes in MoS2 is enhanced by a factor of approximate to 1.65 due to Purcell effect in microcavities. TA spectroscopy study shows modulation of the interband transition process mainly occurs at PB-A band with an estimated F approximate to 1.60. Furthermore, refractive index sensing utilizing WGM peaks of MoS2 is established with sensitivity up to approximate to 150 nm per refractive index unit. The present work provides a large-scale and straightforward method for coupling atomically thin 2D gain media with cavities for high-performance optoelectronic devices and sensors.
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