Abstract-Terahertz nonreciprocal isolator based on a magneto-optical microstructure at room temperature

Fei Fan, Chuan-Zhong Xiong, Jie-Rong Chen, and Sheng Jiang Chang

https://www.osapublishing.org/ol/abstract.cfm?uri=ol-43-4-687&origin=search

We investigated THz nonreciprocal circularly polarized transmission in thin longitudinally magnetized InSb film, especially focusing on its non-eigen nonreciprocal transmission mechanism at room temperature. Then, based on this effect, we presented a THz isolator for linear polarized waves. The nonreciprocal transmission of the InSb film in this device is converted and enhanced by a pair of orthogonal artificial birefringence gratings. After the optimization, the isolation reaches 24 dB, and the insertion loss is <0.5  dB$<0.5\mathrm{dB}$ at room temperature and a low magnetic field.

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