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

Wenhe Jia; Meng Liu; Yongchang Lu; Xi Feng; Qingwei Wang; Xueqian Zhang; Yibo Ni; Futai Hu; Mali Gong; Xinlong Xu; Yuanyuan Huang; Weili Zhang; Yuanmu Yang; Jiaguang Han

doi:10.1038/s41377-020-00452-y

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

Articles

- Broadband terahertz wave generation from an epsilon-near-zero material
- Light: Science & Applications Vol. 10, Issue 1, Pages: 115-122(2021)
- Affiliations：
  
  1.State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
  2.Center for THz Waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
  3.Shaanxi Joint Lab of Graphene, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics and Photon‐ Technology, Northwest University, Xi'an 710069, China
  4.School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA
- Author bio：
  
  Yuanmu Yang (ymyang@tsinghua.edu.cn)
  Jiaguang Han (jiaghan@tju.edu.cn)
- Funds：
- DOI：10.1038/s41377-020-00452-y
  CLC：
- Published：2021，
  
  Published Online：07 January 2021，
  
  Received：03 July 2020，
  
  Revised：03 December 2020，
  
  Accepted：07 December 2020
- Accepted：
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Jia, W. H. et al. Broadband terahertz wave generation from an epsilon-near-zero material. Light: Science & Applications, 10, 115-122 (2021).
DOI：

Jia, W. H. et al. Broadband terahertz wave generation from an epsilon-near-zero material. Light: Science & Applications, 10, 115-122 (2021). DOI： 10.1038/s41377-020-00452-y.

摘要

Abstract

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.

关键词

Keywords

references

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