Enhanced Emission from WSe <inf>2</inf> Monolayers Coupled to Circular Bragg Gratings

Publication Type:
Journal Article
Citation:
ACS Photonics, 2018, 5 (10), pp. 3950 - 3955
Issue Date:
2018-10-17
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© Copyright 2018 American Chemical Society. Two-dimensional transition-metal dichalcogenides (TMDC) are of great interest for on-chip nanophotonics due to their unique optoelectronic properties. Here, we propose and realize coupling of tungsten diselenide (WSe 2 ) monolayers to circular Bragg grating structures to achieve enhanced emission. The interaction between WSe 2 and the resonant mode of the structure results in Purcell-enhanced emission, and the symmetric geometrical structure improves the directionality of the out-coupling stream of emitted photons. Furthermore, this hybrid structure produces a record high contrast of the spin valley readout (>40%) revealed by the polarization-resolved photoluminescence (PL) measurements. Our results are promising for on-chip integration of TMDC monolayers with optical resonators for nanophotonic circuits.
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