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

查看全文 作　　者：Wenhe [1]Jia;Meng [2]Liu;Yongchang [2]Lu;Xi [2]Feng;Qingwei [2]Wang;Xueqian [2]Zhang;Yibo [1]Ni;Futai [1]Hu;Mali [1]Gong;Xinlong [3]Xu;Yuanyuan [3]Huang;Weili [4]Zhang;Yuanmu [1]Yang;Jiaguang [2]Han

机构地区：[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

出　　处：《Light(Science & Applications)》索引2021年第10卷第1期,共8页

基　　金：This work was supported by the National Key Research and Development Program of China(Grant number 2017YFA0701004);the National Natural Science Foundation of China(Grant numbers 61975251,61875150,61735012,and 11774288). 摘　　要：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 19nmthick 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 phasematching 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：PUMP film MATCHING

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

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