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A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces

We present strong enhancement of third harmonic generation in an amorphous silicon metasurface consisting of elliptical nano resonators. We show that this enhancement originates from a new type of multi-mode Fano mechanism. These ‘Super-Fano’ resonances are investigated numerically in great detail u...

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Autores principales: Hähnel, David, Golla, Christian, Albert, Maximilian, Zentgraf, Thomas, Myroshnychenko, Viktor, Förstner, Jens, Meier, Cedrik
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10119293/
https://www.ncbi.nlm.nih.gov/pubmed/37081002
http://dx.doi.org/10.1038/s41377-023-01134-1
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author Hähnel, David
Golla, Christian
Albert, Maximilian
Zentgraf, Thomas
Myroshnychenko, Viktor
Förstner, Jens
Meier, Cedrik
author_facet Hähnel, David
Golla, Christian
Albert, Maximilian
Zentgraf, Thomas
Myroshnychenko, Viktor
Förstner, Jens
Meier, Cedrik
author_sort Hähnel, David
collection PubMed
description We present strong enhancement of third harmonic generation in an amorphous silicon metasurface consisting of elliptical nano resonators. We show that this enhancement originates from a new type of multi-mode Fano mechanism. These ‘Super-Fano’ resonances are investigated numerically in great detail using full-wave simulations. The theoretically predicted behavior of the metasurface is experimentally verified by linear and nonlinear transmission spectroscopy. Moreover, quantitative nonlinear measurements are performed, in which an absolute conversion efficiency as high as η(max) ≈ 2.8 × 10(−7) a peak power intensity of 1.2 GW cm(−2) is found. Compared to an unpatterned silicon film of the same thickness amplification factors of up to ~900 are demonstrated. Our results pave the way to exploiting a strong Fano-type multi-mode coupling in metasurfaces for high THG in potential applications.
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spelling pubmed-101192932023-04-22 A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces Hähnel, David Golla, Christian Albert, Maximilian Zentgraf, Thomas Myroshnychenko, Viktor Förstner, Jens Meier, Cedrik Light Sci Appl Article We present strong enhancement of third harmonic generation in an amorphous silicon metasurface consisting of elliptical nano resonators. We show that this enhancement originates from a new type of multi-mode Fano mechanism. These ‘Super-Fano’ resonances are investigated numerically in great detail using full-wave simulations. The theoretically predicted behavior of the metasurface is experimentally verified by linear and nonlinear transmission spectroscopy. Moreover, quantitative nonlinear measurements are performed, in which an absolute conversion efficiency as high as η(max) ≈ 2.8 × 10(−7) a peak power intensity of 1.2 GW cm(−2) is found. Compared to an unpatterned silicon film of the same thickness amplification factors of up to ~900 are demonstrated. Our results pave the way to exploiting a strong Fano-type multi-mode coupling in metasurfaces for high THG in potential applications. Nature Publishing Group UK 2023-04-21 /pmc/articles/PMC10119293/ /pubmed/37081002 http://dx.doi.org/10.1038/s41377-023-01134-1 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Hähnel, David
Golla, Christian
Albert, Maximilian
Zentgraf, Thomas
Myroshnychenko, Viktor
Förstner, Jens
Meier, Cedrik
A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces
title A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces
title_full A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces
title_fullStr A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces
title_full_unstemmed A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces
title_short A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces
title_sort multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10119293/
https://www.ncbi.nlm.nih.gov/pubmed/37081002
http://dx.doi.org/10.1038/s41377-023-01134-1
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