Even-order optical harmonics generated from centrosymmetric-material metasurfaces

Tonkaev, P; Lai, F; Kruk, S; Song, Q; Scalora, M; Koshelev, K; Kivshar, Y

Even-order optical harmonics generated from centrosymmetric-material metasurfaces

Tonkaev, P Lai, F Kruk, S

Song, Q Scalora, M Koshelev, K Kivshar, Y

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Publisher:: American Physical Society (APS)
Publication Type:: Journal Article
Citation:: Physical Review Research, 2024, 6, (3), pp. 033073
Issue Date:: 2024-06-01

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Field	Value	Language
dc.contributor.author	Tonkaev, P
dc.contributor.author	Lai, F
dc.contributor.author	Kruk, S https://orcid.org/0000-0003-0624-4033
dc.contributor.author	Song, Q
dc.contributor.author	Scalora, M
dc.contributor.author	Koshelev, K
dc.contributor.author	Kivshar, Y
dc.date.accessioned	2025-03-06T02:58:55Z
dc.date.available	2024-06-27
dc.date.available	2025-03-06T02:58:55Z
dc.date.issued	2024-06-01
dc.identifier.citation	Physical Review Research, 2024, 6, (3), pp. 033073
dc.identifier.issn	2643-1564
dc.identifier.issn	2643-1564
dc.identifier.uri	http://hdl.handle.net/10453/185526
dc.description.abstract	Generation of even-order optical harmonics requires noncentrosymmetric structures being conventionally observed in crystals lacking the center of inversion. In centrosymmetric systems, even-order harmonics may arise, e.g., at surfaces but such effects are usually very weak. Here we observe optical harmonics up to fourth order generated under the normal incidence from centrosymmetric dielectric metasurfaces empowered by resonances. We design silicon metasurfaces supporting optical quasibound states in the continuum and guided-mode resonances, and demonstrate the enhancement of second-harmonic signals by over three orders of magnitude compared to nonresonant thin films. Under the optimal conditions, the brightness of the second harmonic approaches that of the third harmonic, and the fourth-order harmonic becomes detectable.
dc.language	en
dc.publisher	American Physical Society (APS)
dc.relation.ispartof	Physical Review Research
dc.relation.isbasedon	10.1103/PhysRevResearch.6.033073
dc.rights	info:eu-repo/semantics/openAccess
dc.subject.classification	51 Physical sciences
dc.title	Even-order optical harmonics generated from centrosymmetric-material metasurfaces
dc.type	Journal Article
utslib.citation.volume	6
pubs.organisational-group	University of Technology Sydney
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
utslib.copyright.status	open_access	*
dc.rights.license	This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0). To view a copy of this license, visit https://creativecommons.org/licenses/by/4.0/
dc.date.updated	2025-03-06T02:58:53Z
pubs.issue	3
pubs.publication-status	Published
pubs.volume	6
utslib.citation.issue	3

Abstract:

Generation of even-order optical harmonics requires noncentrosymmetric structures being conventionally observed in crystals lacking the center of inversion. In centrosymmetric systems, even-order harmonics may arise, e.g., at surfaces but such effects are usually very weak. Here we observe optical harmonics up to fourth order generated under the normal incidence from centrosymmetric dielectric metasurfaces empowered by resonances. We design silicon metasurfaces supporting optical quasibound states in the continuum and guided-mode resonances, and demonstrate the enhancement of second-harmonic signals by over three orders of magnitude compared to nonresonant thin films. Under the optimal conditions, the brightness of the second harmonic approaches that of the third harmonic, and the fourth-order harmonic becomes detectable.

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http://hdl.handle.net/10453/185526