Journal
NANO LETTERS
Volume 20, Issue 7, Pages 5309-5314Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c01603
Keywords
all-dielectric metasurfaces; two-dimensional material; nanophotonics; bound states in the continuum; second-harmonic generation
Categories
Funding
- Australian Research Council [DE180100070, DP150102071]
- University of Technology Sydney
- Strategic Fund of the Australian National University
- Russian Foundation for Basic Research [19-02-00419, 19-32-90106]
- Foundation for the Advancement of Theoretical Physics and Mathematics BASIS
- Australian Research Council [DE180100070] Funding Source: Australian Research Council
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Atomically thin monolayers of transition metal dichalcogenides (TMDs) have emerged as a promising class of novel materials for optoelectronics and nonlinear optics. However, the intrinsic nonlinearity of TMD monolayers is weak, limiting their functionalities for nonlinear optical processes such as frequency conversion. Here we boost the effective nonlinear susceptibility of a TMD monolayer by integrating it with a resonant dielectric metasurface that supports pronounced optical resonances with high quality factors: bound states in the continuum (BICs). We demonstrate that a WS2 monolayer combined with a silicon metasurface hosting BICs exhibits enhanced second-harmonic intensity by more than 3 orders of magnitude relative to a WS2 monolayer on top of a flat silicon film of the same thickness. Our work suggests a pathway to employ high-index dielectric metasurfaces as hybrid structures for enhancement of TMD nonlinearities with applications in nonlinear microscopy, optoelectronics, and signal processing.
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