Broadband terahertz wave generation from an epsilon-near-zero material

Broadband light sources emitting in the terahertz spectral range are highly desired for applications such as noninvasive imaging and spectroscopy. Conventionally, THz pulses are generated by optical rectification in bulk nonlinear crystals with millimetre thickness, with the bandwidth limited by the...

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Autores principales: Jia, Wenhe, Liu, Meng, Lu, Yongchang, Feng, Xi, Wang, Qingwei, Zhang, Xueqian, Ni, Yibo, Hu, Futai, Gong, Mali, Xu, Xinlong, Huang, Yuanyuan, Zhang, Weili, Yang, Yuanmu, Han, Jiaguang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
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Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7790823/
https://www.ncbi.nlm.nih.gov/pubmed/33414366
http://dx.doi.org/10.1038/s41377-020-00452-y
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author Jia, Wenhe
Liu, Meng
Lu, Yongchang
Feng, Xi
Wang, Qingwei
Zhang, Xueqian
Ni, Yibo
Hu, Futai
Gong, Mali
Xu, Xinlong
Huang, Yuanyuan
Zhang, Weili
Yang, Yuanmu
Han, Jiaguang
author_facet Jia, Wenhe
Liu, Meng
Lu, Yongchang
Feng, Xi
Wang, Qingwei
Zhang, Xueqian
Ni, Yibo
Hu, Futai
Gong, Mali
Xu, Xinlong
Huang, Yuanyuan
Zhang, Weili
Yang, Yuanmu
Han, Jiaguang
author_sort Jia, Wenhe
collection PubMed
description Broadband light sources emitting in the terahertz spectral range are highly desired for applications such as noninvasive imaging and spectroscopy. Conventionally, THz pulses are generated by optical rectification in bulk nonlinear crystals with millimetre thickness, with the bandwidth limited by the phase-matching condition. Here we demonstrate broadband THz emission via surface optical rectification from a simple, commercially available 19 nm-thick indium tin oxide (ITO) thin film. We show an enhancement of the generated THz signal when the pump laser is tuned around the epsilon-near-zero (ENZ) region of ITO due to the pump laser field enhancement associated with the ENZ effect. The bandwidth of the THz signal generated from the ITO film can be over 3 THz, unrestricted by the phase-matching condition. This work offers a new possibility for broadband THz generation in a subwavelength thin film made of an ENZ material, with emerging physics not found in existing nonlinear crystals.
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spelling pubmed-77908232021-01-14 Broadband terahertz wave generation from an epsilon-near-zero material Jia, Wenhe Liu, Meng Lu, Yongchang Feng, Xi Wang, Qingwei Zhang, Xueqian Ni, Yibo Hu, Futai Gong, Mali Xu, Xinlong Huang, Yuanyuan Zhang, Weili Yang, Yuanmu Han, Jiaguang Light Sci Appl Article Broadband light sources emitting in the terahertz spectral range are highly desired for applications such as noninvasive imaging and spectroscopy. Conventionally, THz pulses are generated by optical rectification in bulk nonlinear crystals with millimetre thickness, with the bandwidth limited by the phase-matching condition. Here we demonstrate broadband THz emission via surface optical rectification from a simple, commercially available 19 nm-thick indium tin oxide (ITO) thin film. We show an enhancement of the generated THz signal when the pump laser is tuned around the epsilon-near-zero (ENZ) region of ITO due to the pump laser field enhancement associated with the ENZ effect. The bandwidth of the THz signal generated from the ITO film can be over 3 THz, unrestricted by the phase-matching condition. This work offers a new possibility for broadband THz generation in a subwavelength thin film made of an ENZ material, with emerging physics not found in existing nonlinear crystals. Nature Publishing Group UK 2021-01-07 /pmc/articles/PMC7790823/ /pubmed/33414366 http://dx.doi.org/10.1038/s41377-020-00452-y Text en © The Author(s) 2021 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
Jia, Wenhe
Liu, Meng
Lu, Yongchang
Feng, Xi
Wang, Qingwei
Zhang, Xueqian
Ni, Yibo
Hu, Futai
Gong, Mali
Xu, Xinlong
Huang, Yuanyuan
Zhang, Weili
Yang, Yuanmu
Han, Jiaguang
Broadband terahertz wave generation from an epsilon-near-zero material
title Broadband terahertz wave generation from an epsilon-near-zero material
title_full Broadband terahertz wave generation from an epsilon-near-zero material
title_fullStr Broadband terahertz wave generation from an epsilon-near-zero material
title_full_unstemmed Broadband terahertz wave generation from an epsilon-near-zero material
title_short Broadband terahertz wave generation from an epsilon-near-zero material
title_sort broadband terahertz wave generation from an epsilon-near-zero material
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7790823/
https://www.ncbi.nlm.nih.gov/pubmed/33414366
http://dx.doi.org/10.1038/s41377-020-00452-y
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