Wavelength tunable microdisk cavity light source with a chemically enhanced MoS2 emitter.
In this work, we report an integrated narrowband light source based on thin MoS2 emissive material coupled to the high quality factor whispering gallery modes of a microdisk cavity with a spatial notch that enables easy out-coupling of emission while it yields high spatial coherence and a Gaussian intensity distribution. The active light emitting material consists of chemically enhanced bilayer MoS2 flakes with a thin atomic layer deposited SiO2 protective coating that yields 20-times brighter chemically enhanced photoluminescence compared to as-exfoliated monolayers on the microdisk. Quality factors ≈ 1000 are observed as well as a high degree of spatial coherence. We also experimentally achieve effective index tuning of cavity coupled emission over a full free spectral range. The thermal response of this system is also studied. This work provides new insights for nanophotonic light sources with atomically thin active media.
Department of Materials Science and Engineering and ‡Department of Electrical and Systems Engineering, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States.
Jason C
JC
Reed
Alexander Y
AY
Zhu
Hai
H
Zhu
Fei
F
Yi
Ertugrul
E
Cubukcu
2D Semiconductor; MoS2; microdisk optical cavity; narrowband light source; photoluminesence enhancement