实现太赫兹时域光谱仪欠采样方法的窄带滤波器设计

A. Rybak, S. Kuznetsov, A. V. Arzhannikov, N. Nikolaev
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引用次数: 0

摘要

本文设计了一种中心频率为ν = 806 GHz (λ = 372 μm)的窄带准光学滤波器,适用于太赫兹时域光谱欠采样技术的实现。选取该频率监测大气局部透明窗口内分子气体CO的吸收谱线。该过滤器被设计为基于聚丙烯膜的法布里-珀罗标准子,其两侧有频率选择表面(FFS),由喷涂铝层中的方形槽组成。通过对所提出结构的传输进行数值模拟,我们确定了金属桥的宽度a与FSS的节距g的最佳比值在a/g = 0.5附近。当g小于工作波长λ的一半时,滤波器的频宽比小于4%,足以实现太赫兹时域光谱中的欠采样方法。
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Design of a Narrowband Filter for Implementing the Undersamping Method in Terahertz Time-Domain Spectrometers
In this paper, we propose a design of a narrow-band quasi-optical filter with a central frequency ν = 806 GHz (λ = 372 μm) suitable for the implementation of the undersampling technique in terahertz time-domain spectroscopy. The frequency was chosen to monitor the absorption line of the molecular gas CO in the local transparency window of the atmosphere. The filter is designed as the Fabry-Perot etalon based on a polypropylene film with frequencyselective surfaces (FFS) on both sides consisting of square slots in a sprayed aluminum layer. Through numerical simulation of the transmission of the proposed structure, we defined that the optimum ratio of the width of the metal bridge a to the pitch g of the FSS lies in the vicinity of a/g = 0.5. For g less than half of the operating wavelength λ, the FWHM of the filter is less than 4%, which is sufficient for the implementation of the undersampling method in terahertz time-domain spectroscopy.
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