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Appl Phys Lett. 2013 Oct 28;103(18):181119. Epub 2013 Nov 1.

Controlling the spontaneous emission rate of monolayer MoS2 in a photonic crystal nanocavity.

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1
School of Science, Northwestern Polytechnical University, Xi'an 710072, China ; Department of Electrical Engineering, Columbia University, New York, New York 10027, USA.

Abstract

We report on controlling the spontaneous emission (SE) rate of a molybdenum disulfide (MoS2) monolayer coupled with a planar photonic crystal (PPC) nanocavity. Spatially resolved photoluminescence (PL) mapping shows strong variations of emission when the MoS2 monolayer is on the PPC cavity, on the PPC lattice, on the air gap, and on the unpatterned gallium phosphide substrate. Polarization dependences of the cavity-coupled MoS2 emission show a more than 5 times stronger extracted PL intensity than the un-coupled emission, which indicates an underlying cavity mode Purcell enhancement of the MoS2 SE rate exceeding a factor of 70.

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