Open AccessTerahertz magneto-optical response of bismuth-gadolinium-substituted rare-earth garnet film
Author(s) -
Yilei Li,
Ding Zhang,
Min Luo,
Qinghui Yang,
Fei Fan,
Shengjiang Chang,
Qiye Wen
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.431234
Subject(s) - faraday effect , terahertz radiation , verdet constant , materials science , optics , bismuth , optical isolator , transmittance , magnetic field , gadolinium , optoelectronics , laser , physics , quantum mechanics , metallurgy
We report the magneto-optical Faraday response of bismuth-gadolinium-substituted rare-earth iron garnet at terahertz frequencies ranging from 100 GHz to 1.2 THz. The maximum transmittance of ±45° component is about 60% near the frequency point of 0.63 THz. When the external magnetic field change from -100 mT to +100 mT, the Faraday rotation angle is between -6° and +7.5°. The overall change of ellipticity is relatively small. The maximum value of the Verdet constant is about 260 °/mm/T at 0.1 THz and then gradually decreases to 80 °/mm/T at 1.2 THz. Within the considered frequency range, the thick film exhibits magnetically tunable, non-reciprocal characters and a strong magneto-optical effect within a small external magnetic field at room temperature, which will be widely used for the terahertz isolators, circulators, nonreciprocal phase shifters, and magneto-optical modulators.