Two-dimensional van der Waals materials have opened a new paradigm for fundamental physics exploration and device applications because of their emerging physical properties. Unlike gapless graphene, monolayer transition-metal dichalcogenides (TMDCs) are two-dimensional semiconductors that undergo an indirect-to-direct bandgap transition1,2,3,4,5, creating new optical functionalities for next-generation ultra-compact photonics and optoelectronics. Although the enhancement of spontaneous emission has been reported on TMDC monolayers integrated with photonic crystals6,7 and distributed Bragg reflector microcavities8,9, coherent light emission from a TMDC monolayer has not been demonstrated. Here, we report the realization of a two-dimensional excitonic laser by embedding monolayer WS2 in a microdisk resonator. Using a whispering gallery mode with a high quality factor and optical confinement, we observe bright excitonic lasing at visible wavelengths. This demonstration of a two-dimensional excitonic laser marks a major step towards two-dimensional on-chip optoelectronics for high-performance optical communication and computing applications.
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The authors acknowledge financial support from the US Air Force Office of Scientific Research under award no. FA9550-12-1-0197 (Optical Design and Characterization), and the ‘Light–Material Interaction in Energy Conversion’ Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under award no. DE-AC02-05CH11231 (Materials Synthesis and Lithography). The authors also thank A. Grine for his help in measuring the passive Q factor of the cavity.
The authors declare no competing financial interests.
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Ye, Y., Wong, Z., Lu, X. et al. Monolayer excitonic laser. Nature Photon 9, 733–737 (2015). https://doi.org/10.1038/nphoton.2015.197
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