A terahertz radiation linear polarizer based on using a magnetic fluid in an external magnetic field
Votintsev, Alexey P.; Borisov, Alexey V.; Kochnev, Zakhar S.; Meglinski, Igor; Kistenev, Yury V. (2023-06-11)
Votintsev AP, Borisov AV, Kochnev ZS, Meglinski I, Kistenev YV. A Terahertz Radiation Linear Polarizer Based on Using a Magnetic Fluid in an External Magnetic Field. Photonics. 2023; 10(6):675. https://doi.org/10.3390/photonics10060675
© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
https://urn.fi/URN:NBN:fi-fe20230906120274
Tiivistelmä
Abstract
A model of a magnetically controlled linear polarizer of terahertz (THz) waves based on a cell filled with a magnetic fluid and controlled by an external magnetic field was proposed. The magnetic fluid consisted of a synthetic oil with high transparency in the THz range and ferromagnetic alloy microparticles. Selection of the ferromagnetic particles size and concentration, and also parameters of the external magnetic field was conducted. It was shown that when using ferromagnetic particles of 10–35 μm size, a concentration of 10 wt.%, and a magnetic field with induction of 6.7–57.2 mT, the created construction works as a linear polarizer of the THz wave in the ranged from 0.3 to 1.5 THz, with the degree of polarization of the initially non-polarized THz wave transmitted through the cell being at least of 80%.
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