Optically Pumped Monolayer MoSe 2 Excitonic Lasers from Whispering Gallery Mode Microcavities

• Published in: The journal of physical chemistry letters Vol. 11; no. 2; pp. 541 - 547
• Main Authors: Fu, Xinpeng, Fu, Xihong, Chen, Yongyi, Qin, Li, Peng, Hangyu, Shi, Ruixin, Li, Fangfei, Zhou, Qiang, Wang, Yubing, Zhou, Yinli, Ning, Yongqiang
• Format: Journal Article
• Language: English
• Published: United States 16-01-2020
• ISSN: 1948-7185; 1948-7185
• DOI: 10.1021/acs.jpclett.9b03589

Developing integrable, nanoscale, and low-energy-consumption lasers is a crucial step toward on-chip optical communications and computing technologies. The strong exciton-photon interaction that emerged in monolayer transition metal dichalcogenides (TMDs) holds promise for engineering and integration. Herein, we prepare the MoSe
/microsphere cavities excitonic lasers by placing SiO
microspheres on top of a monolayer MoSe
film. By virtue of continuous-wave exciting MoSe
/microsphere whispering gallery mode (WGM) cavities, we realize multiple excitonic WGM lasing in the emission wavelength range of ∼750-875 nm at room temperature with tunable properties of free spectral range (FSR) and full width at half-maximum (fwhm) by varying the microsphere size. Theoretical calculations based on the finite element method (FEM) using COMSOL software were utilized to identify lasing modes and reveal the corresponding electric field distribution. These findings help to deepen fundamental understanding of excitonic WGM lasing and provide a promising research platform for integrable, scalable, and low-cost laser devices.