Physical principles of filtration and the design of terahertz radiation filters

A.K. Kaveev^†^a, G.I. Kropotov^b
^aIoffe Institute, ul. Polytekhnicheskaya 26, St. Petersburg, 194021, Russian Federation
^bTydex LLC, Domostroitelnaya str. 16, St. Peterburg, 194292, Russian Federation

Present review examines the basic physical principles of operation of terahertz radiation filters. The main types of filters are presented, namely, based on absorbing/scattering materials, metamaterials (frequency-selective surfaces), interference, polarization, and some exotic types. The basic principles of calculating the filters transmission based on matrix methods are described, as well as based on solving Maxwell's equations. The areas of application of THz filters are listed.

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Keywords: THz, cutoff filters, high-pass filters, band-pass filters, notch filters, absorption, metamaterials, frequency-selective surface
PACS: 07.57.−c, 42.25.Ja, 42.81.Gs (all)
DOI: 10.3367/UFNe.2025.11.040059
URL: https://ufn.ru/en/articles/2026/2/e/
Citation: Kaveev A K, Kropotov G I "Physical principles of filtration and the design of terahertz radiation filters" Phys. Usp. 69 (2) (2026)

Received: 16th, March 2025, revised: 9th, November 2025, accepted: 11th, November 2025

Оригинал: Кавеев А К, Кропотов Г И «Физические принципы фильтрации и устройство фильтров терагерцового излучения» УФН 196 182–204 (2026); DOI: 10.3367/UFNr.2025.11.040059

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