Enhanced Emission from WSe2 Monolayers Coupled to Circular Bragg Gratings
AuthorsDuong, Ngoc My Hanh
Tran, Toan Trong
KAUST DepartmentMaterial Science and Engineering Program
Physical Science and Engineering (PSE) Division
Preprint Posting Date2018-06-18
Online Publication Date2018-09-10
Print Publication Date2018-10-17
Permanent link to this recordhttp://hdl.handle.net/10754/631614
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AbstractTwo-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) monolayers to circular Bragg grating structures to achieve enhanced emission. The interaction between WSe 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.
CitationDuong NMH, Xu Z-Q, Kianinia M, Su R, Liu Z, et al. (2018) Enhanced Emission from WSe2 Monolayers Coupled to Circular Bragg Gratings. ACS Photonics 5: 3950–3955. Available: http://dx.doi.org/10.1021/acsphotonics.8b00865.
SponsorsThe authors are thankful for financial support from the Australian Research council (via DP180100077, DE180100070, DE 1801100810), the Asian Office of Aerospace Research and Development grant FA2386-17-1-4064, the Office of Naval Research Global under grant number N62909-18-1-2025, National Key R & D Program of China (Grants No. 2018YFA0306100), the National Natural Science Foundation of China (Grant No. 11874437), Guangzhou Science and Technology project (Grant No. 201805010004). This research is supported by an Australian Government Research Training Program Scholarship.
PublisherAmerican Chemical Society (ACS)