面向宽带低温太赫兹系统的三维结构聚乙烯窗
光学
2025-10-20 v1 仪器与探测器
摘要
我们展示了一种基于高分子量聚乙烯(UHMWPE)的宽带真空窗和红外滤波器的设计、制造与表征，用于覆盖 ALMA Band 6 和 Band 7(211-373 GHz)的毫米波接收器。该窗 incorporates 金字塔抗反射(AR)结构，直接通过 CNC 铣削加工于聚乙烯中，实现宽频范围的阻抗匹配。UHMWPE 的表面结构化方法在两个独立组件上实现：一个真空窗和一个低温红外滤波器。这种表面结构化方法提供了机械刚性、低温兼容性和低插入损耗。我们采用太赫兹时间域光谱(THz-TDS)对传输特性进行表征，结果显示在整个频段内反射率均低于 5%。补充的异构测量确认接收器噪声性能的提升。这些结果表明，三维结构化 UHMWPE 作为宽带低温光学器件的平台，为高灵敏度 THz 仪器的开发提供了广阔的前景。
引用
@article{arxiv.2510.15680,
title = {3D-Structured Polyethylene Windows for Low-Loss Transmission in Wideband Cryogenic Terahertz Systems},
author = {François Joint and Igor Lapkin and Pierre-Baptiste Vigneron and Emilie Hérault and Denis Meledin and Alexei Pavolotsky and Magnus Strandberg and Sven Erik Ferm and Mathias Fredrixon and Leif Helldner and Erik Sundin and Victor Belitsky and Vincent Desmaris},
journal= {arXiv preprint arXiv:2510.15680},
year = {2025}
}
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