A conformal mapping approach to broadband nonlinear optics on chip

Integrated nonlinear optical devices play an important role in modern optical communications; however, conventional on-chip optical devices with homogeneous or periodic translation dimensions generally have limited bandwidth when applied to nonlinear optical applications. So far there lacks a genera...

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Main Authors: Huang, Chunyu, Luo, Yu, Zhao, Yule, Ma, Xiaofei, Yan, Zhiwei, Liu, Ziyi, Sheng, Chong, Zhu, Shining, Liu, Hui
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2024
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Online Access:https://hdl.handle.net/10356/174826
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1748262024-04-19T15:53:05Z A conformal mapping approach to broadband nonlinear optics on chip Huang, Chunyu Luo, Yu Zhao, Yule Ma, Xiaofei Yan, Zhiwei Liu, Ziyi Sheng, Chong Zhu, Shining Liu, Hui School of Electrical and Electronic Engineering Centre for OptoElectronics and Biophotonics (COEB) Physics Nonlinear optics Interferometry Integrated nonlinear optical devices play an important role in modern optical communications; however, conventional on-chip optical devices with homogeneous or periodic translation dimensions generally have limited bandwidth when applied to nonlinear optical applications. So far there lacks a general method to design compact nonlinear optical devices capable of operating over a broadband continuous frequency range. In this work we propose a general strategy based on transformation optics to design curved accelerating waveguides with spatially gradient curvatures, which can achieve broadband nonlinear frequency conversion on chip. Through rigorous analytical calculation, we show that increasing the acceleration (that is, the gradient in the waveguide curvature) broadens the output signal spectrum in the nonlinear process. In this experiment we use sum-frequency generation for infrared signal upconversion as an example and fabricated a variety of curved accelerating waveguides using thin-film lithium niobate on insulators. Efficient sum-frequency generation is observed over a broadband continuous spectrum. Our conformal mapping approach offers a platform for various nonlinear optical processes and works in any frequency range, including visible, infrared and terahertz bands. Apart from lithium niobate on insulators, our approach is also compatible with other nonlinear materials such as silicon, silicon nitride and chalcogenide glasses and so on. Agency for Science, Technology and Research (A*STAR) National Research Foundation (NRF) Submitted/Accepted version This work was financially supported by the National Natural Science Foundation of China (grant nos. 92150302 and 92163216 to H. L., 62288101 to S. Z. and 12174187 to C.S.) and the National Key R&D Program of China (grant no. 2023YFB2805700 to C.S.). This work was sponsored by the National Research Foundation Singapore Competitive Research Program (grant nos. NRF-CRP22-2019-0006 and NRF-CRP23-2019-0007 to Y. L.), and A*STAR AME Programmatic Funds (grant no. A18A7b0058 to Y.L.). 2024-04-16T05:10:28Z 2024-04-16T05:10:28Z 2024 Journal Article Huang, C., Luo, Y., Zhao, Y., Ma, X., Yan, Z., Liu, Z., Sheng, C., Zhu, S. & Liu, H. (2024). A conformal mapping approach to broadband nonlinear optics on chip. Nature Photonics. https://dx.doi.org/10.1038/s41566-024-01386-2 1749-4893 https://hdl.handle.net/10356/174826 10.1038/s41566-024-01386-2 2-s2.0-85184915819 en NRF-CRP22-2019-0006 A18A7b0058 NRF-CRP23-2019-0007 Nature Photonics © 2024 The Author(s), under exclusive licence to Springer Nature Limited. All rights reserved. This article may be downloaded for personal use only. Any other use requires prior permission of the copyright holder. The Version of Record is available online at http://doi.org/10.1038/s41566-024-01386-2. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Physics
Nonlinear optics
Interferometry
spellingShingle Physics
Nonlinear optics
Interferometry
Huang, Chunyu
Luo, Yu
Zhao, Yule
Ma, Xiaofei
Yan, Zhiwei
Liu, Ziyi
Sheng, Chong
Zhu, Shining
Liu, Hui
A conformal mapping approach to broadband nonlinear optics on chip
description Integrated nonlinear optical devices play an important role in modern optical communications; however, conventional on-chip optical devices with homogeneous or periodic translation dimensions generally have limited bandwidth when applied to nonlinear optical applications. So far there lacks a general method to design compact nonlinear optical devices capable of operating over a broadband continuous frequency range. In this work we propose a general strategy based on transformation optics to design curved accelerating waveguides with spatially gradient curvatures, which can achieve broadband nonlinear frequency conversion on chip. Through rigorous analytical calculation, we show that increasing the acceleration (that is, the gradient in the waveguide curvature) broadens the output signal spectrum in the nonlinear process. In this experiment we use sum-frequency generation for infrared signal upconversion as an example and fabricated a variety of curved accelerating waveguides using thin-film lithium niobate on insulators. Efficient sum-frequency generation is observed over a broadband continuous spectrum. Our conformal mapping approach offers a platform for various nonlinear optical processes and works in any frequency range, including visible, infrared and terahertz bands. Apart from lithium niobate on insulators, our approach is also compatible with other nonlinear materials such as silicon, silicon nitride and chalcogenide glasses and so on.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Huang, Chunyu
Luo, Yu
Zhao, Yule
Ma, Xiaofei
Yan, Zhiwei
Liu, Ziyi
Sheng, Chong
Zhu, Shining
Liu, Hui
format Article
author Huang, Chunyu
Luo, Yu
Zhao, Yule
Ma, Xiaofei
Yan, Zhiwei
Liu, Ziyi
Sheng, Chong
Zhu, Shining
Liu, Hui
author_sort Huang, Chunyu
title A conformal mapping approach to broadband nonlinear optics on chip
title_short A conformal mapping approach to broadband nonlinear optics on chip
title_full A conformal mapping approach to broadband nonlinear optics on chip
title_fullStr A conformal mapping approach to broadband nonlinear optics on chip
title_full_unstemmed A conformal mapping approach to broadband nonlinear optics on chip
title_sort conformal mapping approach to broadband nonlinear optics on chip
publishDate 2024
url https://hdl.handle.net/10356/174826
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