Enhanced Transmission from Visible to Terahertz in ZnTe Crystals with Scalable Subwavelength Structures

Han Sun, Jianxi Liu, Ce Zhou, Wenhui Yang, Hao Liu, Xin Zhang, Zhihuan Li, Binbin Zhang, Wanqi Jie, Yadong Xu

科研成果: 期刊稿件文章同行评审

22 引用 (Scopus)

摘要

The zinc blend nonlinear crystal of zinc telluride (ZnTe) is currently one of the most commonly used electro-optical material for terahertz (THz) probe and imaging. We report herein how to engineer the surface behavior of a ZnTe single crystal to design subwavelength structures (SWSs) for enhancing ultrabroadband transmission. Polystyrene (PS) nanoparticle monolayers with a maximum coverage of 85.2% were produced on the ZnTe crystal by an eccentric spin-coating technique combined with surface wettability engineering. Subsequently, the well-defined conical SWS arrays were fabricated on the ZnTe crystal by reactive ion etching over the PS monolayer template, with the size of the SWS arrays customized by optimizing the etching process. Finally, we demonstrated ultrabroadband antireflection on the surface structured ZnTe crystals in the visible-near-infrared, infrared, and terahertz regions with transmittance increase of 11.6%, 10.0%, and 24.8%, which are attributed to the decrease of surface Fresnel reflection by SWS. Notably, in 0.2-1.0 THz, the transmittance reached over 70%. Our work provides a new strategy to enhance the THz generation efficiency and detection sensitivity based on ZnTe crystals by surface engineering.

源语言英语
页(从-至)16997-17005
页数9
期刊ACS Applied Materials and Interfaces
13
14
DOI
出版状态已出版 - 14 4月 2021

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