TY - JOUR
T1 - Enhanced Transmission from Visible to Terahertz in ZnTe Crystals with Scalable Subwavelength Structures
AU - Sun, Han
AU - Liu, Jianxi
AU - Zhou, Ce
AU - Yang, Wenhui
AU - Liu, Hao
AU - Zhang, Xin
AU - Li, Zhihuan
AU - Zhang, Binbin
AU - Jie, Wanqi
AU - Xu, Yadong
N1 - Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/4/14
Y1 - 2021/4/14
N2 - 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.
AB - 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.
KW - antireflection
KW - polystyrene nanparticle
KW - subwavelength structure
KW - terahertz
KW - ZnTe
UR - http://www.scopus.com/inward/record.url?scp=85104370007&partnerID=8YFLogxK
U2 - 10.1021/acsami.0c22772
DO - 10.1021/acsami.0c22772
M3 - 文章
C2 - 33788555
AN - SCOPUS:85104370007
SN - 1944-8244
VL - 13
SP - 16997
EP - 17005
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 14
ER -