Linear-polarized terahertz isolator by breaking the gyro-mirror symmetry in cascaded magneto-optical metagrating

To realize nonreciprocal transmission, it is necessary to break the time-reversal symmetry of the transmission system, but it is very challenging to keep the linear polarized (LP) input and output unchanged in the free space transmission system. Magnetized semiconductor InSb can realize terahertz (T...

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Autores principales:	Tan Zhiyu, Fan Fei, Zhao Dan, Li Shanshan, Wang Xianghui, Chang Shengjiang
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	isolator magneto-optical effect meta-grating terahertz Physics QC1-999
Acceso en línea:	https://doaj.org/article/bed913c5cbd74d71b7eaa678b14a4135
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spelling	oai:doaj.org-article:bed913c5cbd74d71b7eaa678b14a41352021-12-05T14:10:56ZLinear-polarized terahertz isolator by breaking the gyro-mirror symmetry in cascaded magneto-optical metagrating2192-861410.1515/nanoph-2021-0416https://doaj.org/article/bed913c5cbd74d71b7eaa678b14a41352021-10-01T00:00:00Zhttps://doi.org/10.1515/nanoph-2021-0416https://doaj.org/toc/2192-8614To realize nonreciprocal transmission, it is necessary to break the time-reversal symmetry of the transmission system, but it is very challenging to keep the linear polarized (LP) input and output unchanged in the free space transmission system. Magnetized semiconductor InSb can realize terahertz (THz) nonreciprocal transmission for the two conjugated photonic spin states, but it cannot realize efficient one-way transmission of LP state due to gyro-mirror symmetry. In this work, by introducing a pair of orthogonal uniaxial anisotropies from the meta-gratings on both sides of InSb, both the gyro-mirror and time-reversal symmetries are broken for the LP state, thus making this cascaded grating–InSb–grating structure serves as a high-performance isolator for the LP light. The experiment results indicate isolation of 50 dB at 0.4 THz for the same LP input and output under a weak biased magnetic field of 0.17 T. Moreover, we further illustrate the factors affecting the isolation bandwidth of the device, also demonstrated another broadband structure with the 10 dB isolation bandwidth from 0.2–0.7 THz, and the relative bandwidth achieves 110%. The mechanisms of THz nonreciprocal transmission and polarization manipulation proposed in this work will contribute to the development of efficient THz magneto-optical devices.Tan ZhiyuFan FeiZhao DanLi ShanshanWang XianghuiChang ShengjiangDe Gruyterarticleisolatormagneto-optical effectmeta-gratingterahertzPhysicsQC1-999ENNanophotonics, Vol 10, Iss 16, Pp 4141-4148 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	isolator magneto-optical effect meta-grating terahertz Physics QC1-999
spellingShingle	isolator magneto-optical effect meta-grating terahertz Physics QC1-999 Tan Zhiyu Fan Fei Zhao Dan Li Shanshan Wang Xianghui Chang Shengjiang Linear-polarized terahertz isolator by breaking the gyro-mirror symmetry in cascaded magneto-optical metagrating
description	To realize nonreciprocal transmission, it is necessary to break the time-reversal symmetry of the transmission system, but it is very challenging to keep the linear polarized (LP) input and output unchanged in the free space transmission system. Magnetized semiconductor InSb can realize terahertz (THz) nonreciprocal transmission for the two conjugated photonic spin states, but it cannot realize efficient one-way transmission of LP state due to gyro-mirror symmetry. In this work, by introducing a pair of orthogonal uniaxial anisotropies from the meta-gratings on both sides of InSb, both the gyro-mirror and time-reversal symmetries are broken for the LP state, thus making this cascaded grating–InSb–grating structure serves as a high-performance isolator for the LP light. The experiment results indicate isolation of 50 dB at 0.4 THz for the same LP input and output under a weak biased magnetic field of 0.17 T. Moreover, we further illustrate the factors affecting the isolation bandwidth of the device, also demonstrated another broadband structure with the 10 dB isolation bandwidth from 0.2–0.7 THz, and the relative bandwidth achieves 110%. The mechanisms of THz nonreciprocal transmission and polarization manipulation proposed in this work will contribute to the development of efficient THz magneto-optical devices.
format	article
author	Tan Zhiyu Fan Fei Zhao Dan Li Shanshan Wang Xianghui Chang Shengjiang
author_facet	Tan Zhiyu Fan Fei Zhao Dan Li Shanshan Wang Xianghui Chang Shengjiang
author_sort	Tan Zhiyu
title	Linear-polarized terahertz isolator by breaking the gyro-mirror symmetry in cascaded magneto-optical metagrating
title_short	Linear-polarized terahertz isolator by breaking the gyro-mirror symmetry in cascaded magneto-optical metagrating
title_full	Linear-polarized terahertz isolator by breaking the gyro-mirror symmetry in cascaded magneto-optical metagrating
title_fullStr	Linear-polarized terahertz isolator by breaking the gyro-mirror symmetry in cascaded magneto-optical metagrating
title_full_unstemmed	Linear-polarized terahertz isolator by breaking the gyro-mirror symmetry in cascaded magneto-optical metagrating
title_sort	linear-polarized terahertz isolator by breaking the gyro-mirror symmetry in cascaded magneto-optical metagrating
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/bed913c5cbd74d71b7eaa678b14a4135
work_keys_str_mv	AT tanzhiyu linearpolarizedterahertzisolatorbybreakingthegyromirrorsymmetryincascadedmagnetoopticalmetagrating AT fanfei linearpolarizedterahertzisolatorbybreakingthegyromirrorsymmetryincascadedmagnetoopticalmetagrating AT zhaodan linearpolarizedterahertzisolatorbybreakingthegyromirrorsymmetryincascadedmagnetoopticalmetagrating AT lishanshan linearpolarizedterahertzisolatorbybreakingthegyromirrorsymmetryincascadedmagnetoopticalmetagrating AT wangxianghui linearpolarizedterahertzisolatorbybreakingthegyromirrorsymmetryincascadedmagnetoopticalmetagrating AT changshengjiang linearpolarizedterahertzisolatorbybreakingthegyromirrorsymmetryincascadedmagnetoopticalmetagrating
_version_	1718371566052442112

Linear-polarized terahertz isolator by breaking the gyro-mirror symmetry in cascaded magneto-optical metagrating

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