Quasi-BIC Resonant Enhancement of Second-Harmonic Generation in WS2 Monolayers.

Bernhardt, N; Koshelev, K; White, SJU; Meng, KWC; Fröch, JE; Kim, S; Tran, TT; Choi, D-Y; Kivshar, Y; Solntsev, AS

Quasi-BIC Resonant Enhancement of Second-Harmonic Generation in WS2 Monolayers.

Bernhardt, N Koshelev, K White, SJU Meng, KWC Fröch, JE Kim, S

Tran, TT Choi, D-Y Kivshar, Y Solntsev, AS

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Publisher:: AMER CHEMICAL SOC
Publication Type:: Journal Article
Citation:: Nano letters, 2020, 20, (7), pp. 5309-5314
Issue Date:: 2020-07

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Field	Value	Language
dc.contributor.author	Bernhardt, N
dc.contributor.author	Koshelev, K
dc.contributor.author	White, SJU
dc.contributor.author	Meng, KWC
dc.contributor.author	Fröch, JE
dc.contributor.author	Kim, S https://orcid.org/0000-0001-9836-3608
dc.contributor.author	Tran, TT
dc.contributor.author	Choi, D-Y
dc.contributor.author	Kivshar, Y
dc.contributor.author	Solntsev, AS
dc.date.accessioned	2022-08-03T03:53:22Z
dc.date.available	2022-08-03T03:53:22Z
dc.date.issued	2020-07
dc.identifier.citation	Nano letters, 2020, 20, (7), pp. 5309-5314
dc.identifier.issn	1530-6984
dc.identifier.issn	1530-6992
dc.identifier.uri	http://hdl.handle.net/10453/159544
dc.description.abstract	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.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	AMER CHEMICAL SOC
dc.relation	http://purl.org/au-research/grants/arc/DE180100070
dc.relation.ispartof	Nano letters
dc.relation.isbasedon	10.1021/acs.nanolett.0c01603
dc.rights	This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.nanolett.0c01603, see http://pubs.acs.org/page/policy/articlesonrequest/index.html
dc.rights	info:eu-repo/semantics/openAccess
dc.subject.classification	Nanoscience & Nanotechnology
dc.title	Quasi-BIC Resonant Enhancement of Second-Harmonic Generation in WS2 Monolayers.
dc.type	Journal Article
utslib.citation.volume	20
utslib.location.activity	United States
utslib.for	1007 Nanotechnology
utslib.for	0303 Macromolecular and Materials Chemistry
utslib.for	0912 Materials Engineering
utslib.for	0205 Optical Physics
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Electrical and Data Engineering
utslib.copyright.status	open_access	*
pubs.consider-herdc	false
dc.date.updated	2022-08-03T03:53:20Z
pubs.issue	7
pubs.publication-status	Published
pubs.volume	20
utslib.citation.issue	7

Abstract:

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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http://hdl.handle.net/10453/159544