Chen Sai, Fan Fei, He Xiaotong, Chen Meng, Chang Shengjiang
Appl Opt. 2015 Nov 1;54(31):9177-82. doi: 10.1364/AO.54.009177.
A magneto-metasurface is demonstrated for one-way transmission of terahertz (THz) waves and magnetic field sensing. Due to the magneto-optical effect and the asymmetric structure of the transmission system, magnetoplasmon mode splitting for forward and backward THz waves and one-way transmission has been observed in this magneto-metasurface. Significantly, the resonance of the magneto-metasurface has been found that can remain at 0.750 THz at a temperature of 218 K, performing as a stable isolator with an isolation of larger than 30 dB within a magnetic field disturbance from 0.23 to 0.35 T. Also, since the resonance of the magneto-metasurface can be tuned by the different external magnetic fields at a temperature that is higher or lower than 218 K, the magneto-metasurface can work as a highly sensitive magnetic field sensor. The sensitivity of this device reaches S=513.05 GHz·T(-1) when T=230 K. This multifunctional magneto-metasurface has broad potential in THz application systems.
一种用于太赫兹（THz）波单向传输和磁场传感的磁超表面被展示出来。由于磁光效应和传输系统的不对称结构，在这种磁超表面中观察到了正向和反向太赫兹波的磁等离子体模式分裂以及单向传输。值得注意的是，已发现磁超表面的共振在218 K温度下可保持在0.750 THz，在0.23至0.35 T的磁场干扰范围内作为一个隔离度大于30 dB的稳定隔离器。此外，由于磁超表面的共振可以在高于或低于218 K的温度下通过不同的外部磁场进行调谐，磁超表面可以用作高灵敏度磁场传感器。当T = 230 K时，该器件的灵敏度达到S = 513.05 GHz·T⁻¹。这种多功能磁超表面在太赫兹应用系统中具有广阔的潜力。
