Improving the technique of terahertz time-domain spectroscopy by means of anti-aliasing filtration and undersampling

Nazar Nikolaev; Alina Rybak; Sergei Kuznetsov

doi:10.1117/12.2687656

26 November 2023 Improving the technique of terahertz time-domain spectroscopy by means of anti-aliasing filtration and undersampling

Nazar Nikolaev, Alina Rybak, Sergei Kuznetsov

Author Affiliations +

Proceedings Volume 12776, Infrared, Millimeter-Wave, and Terahertz Technologies X; 127760G (2023) https://doi.org/10.1117/12.2687656
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Abstract

Approaches based on antialiasing filtration and decimation (subsampling or undersampling) to improve the accuracy and acquisition time of terahertz time-domain spectrometers are proposed. Both rely on preliminary THz-signal filtering and frequency band reduction, followed by sampling interval increasing in accordance with the sampling theorem. The key elements for the task are quasi-optical band-pass (BPFs) and low-pass filters (LPFs). The carefully modeled metasurface design of the multi-layered interference-based microstructures permits the high performance of the filters. They provide a bandwidth of 5% for BPFs and a sharp cut-off edge for LPFs, as well as more than 40 dB out-of-band suppression, although metasurface geometries are based on trivial capacitive and inductive square elements: slits for BPFs and patches for LPFs.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Nazar Nikolaev, Alina Rybak, and Sergei Kuznetsov "Improving the technique of terahertz time-domain spectroscopy by means of anti-aliasing filtration and undersampling", Proc. SPIE 12776, Infrared, Millimeter-Wave, and Terahertz Technologies X, 127760G (26 November 2023); https://doi.org/10.1117/12.2687656

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