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Highly efficient broadband second harmonic generation mediated by mode hybridization and nonlinearity patterning in compact fiber-integrated lithium niobate nano-waveguides

The inherent trade-off between efficiency and bandwidth of three-wave mixing processes in χ(2) nonlinear waveguides is the major impediment for scaling down many well-established frequency conversion schemes onto the level of integrated photonic circuit. Here, we show that hybridization between mode...

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Autores principales: Cai, Lutong, Gorbach, Andrey V., Wang, Yiwen, Hu, Hui, Ding, Wei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6102234/
https://www.ncbi.nlm.nih.gov/pubmed/30127491
http://dx.doi.org/10.1038/s41598-018-31017-0
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author Cai, Lutong
Gorbach, Andrey V.
Wang, Yiwen
Hu, Hui
Ding, Wei
author_facet Cai, Lutong
Gorbach, Andrey V.
Wang, Yiwen
Hu, Hui
Ding, Wei
author_sort Cai, Lutong
collection PubMed
description The inherent trade-off between efficiency and bandwidth of three-wave mixing processes in χ(2) nonlinear waveguides is the major impediment for scaling down many well-established frequency conversion schemes onto the level of integrated photonic circuit. Here, we show that hybridization between modes of a silica microfiber and a LiNbO(3) nanowaveguide, amalgamated with laminar χ(2) patterning, offers an elegant approach for engineering broadband phase matching and high efficiency of three-wave mixing processes in an ultra-compact and natively fiber-integrated setup. We demonstrate exceptionally high normalized second harmonic generation (SHG) efficiency of up to η(nor) ≈ 460% W(−1) cm(−2), combined with a large phase matching bandwidth of Δλ ≈ 100 nm (bandwidth-length product of Δλ · L ≈ 5 μm(2)) near the telecom bands, and extraordinary adjustment flexibility.
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spelling pubmed-61022342018-08-27 Highly efficient broadband second harmonic generation mediated by mode hybridization and nonlinearity patterning in compact fiber-integrated lithium niobate nano-waveguides Cai, Lutong Gorbach, Andrey V. Wang, Yiwen Hu, Hui Ding, Wei Sci Rep Article The inherent trade-off between efficiency and bandwidth of three-wave mixing processes in χ(2) nonlinear waveguides is the major impediment for scaling down many well-established frequency conversion schemes onto the level of integrated photonic circuit. Here, we show that hybridization between modes of a silica microfiber and a LiNbO(3) nanowaveguide, amalgamated with laminar χ(2) patterning, offers an elegant approach for engineering broadband phase matching and high efficiency of three-wave mixing processes in an ultra-compact and natively fiber-integrated setup. We demonstrate exceptionally high normalized second harmonic generation (SHG) efficiency of up to η(nor) ≈ 460% W(−1) cm(−2), combined with a large phase matching bandwidth of Δλ ≈ 100 nm (bandwidth-length product of Δλ · L ≈ 5 μm(2)) near the telecom bands, and extraordinary adjustment flexibility. Nature Publishing Group UK 2018-08-20 /pmc/articles/PMC6102234/ /pubmed/30127491 http://dx.doi.org/10.1038/s41598-018-31017-0 Text en © The Author(s) 2018 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/.
spellingShingle Article
Cai, Lutong
Gorbach, Andrey V.
Wang, Yiwen
Hu, Hui
Ding, Wei
Highly efficient broadband second harmonic generation mediated by mode hybridization and nonlinearity patterning in compact fiber-integrated lithium niobate nano-waveguides
title Highly efficient broadband second harmonic generation mediated by mode hybridization and nonlinearity patterning in compact fiber-integrated lithium niobate nano-waveguides
title_full Highly efficient broadband second harmonic generation mediated by mode hybridization and nonlinearity patterning in compact fiber-integrated lithium niobate nano-waveguides
title_fullStr Highly efficient broadband second harmonic generation mediated by mode hybridization and nonlinearity patterning in compact fiber-integrated lithium niobate nano-waveguides
title_full_unstemmed Highly efficient broadband second harmonic generation mediated by mode hybridization and nonlinearity patterning in compact fiber-integrated lithium niobate nano-waveguides
title_short Highly efficient broadband second harmonic generation mediated by mode hybridization and nonlinearity patterning in compact fiber-integrated lithium niobate nano-waveguides
title_sort highly efficient broadband second harmonic generation mediated by mode hybridization and nonlinearity patterning in compact fiber-integrated lithium niobate nano-waveguides
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6102234/
https://www.ncbi.nlm.nih.gov/pubmed/30127491
http://dx.doi.org/10.1038/s41598-018-31017-0
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