Abstract
A terahertz isolator is demonstrated for the THz nonreciprocal reflections in the magneto-optical microstructure composed of InSb and metasurface with a dielectric interlayer. In the Voigt magnetic field configuration, the reflectance of the p-polarization waves obliquely impinging on the InSb wafer exhibits high nonreciprocity, while the reflectance of the s-polarized wave is reciprocal. Based on the unique magneto-plasmonic modes on the InSb surface, the nonreciprocal reflection in this device can be enhanced by using the destructive interference between the direct reflection and the multiple reflections in the resonance cavity between the InSb and metasurface. After the optimization, the isolation power of the device exceeds 55 dB with the insertion loss of only −3.92 dB under a very weak magnetic field of 0.2 T at room temperature. More importantly, the introduction of the metasurface can reduce the operating frequency of the isolator from 2.434 THz to 2.136 THz. This low-loss, weak magnetic field, room temperature operating, and high isolation THz isolator shows its broad potential in THz application systems.
Highlights
The rapid development of terahertz (THz) science and technology has a high impact on fundamental science and practical applications, such as security, imaging, spectroscopy, and wireless communications, among others [1,2,3,4]
The results show that a high-performance THz optical isolator is achieved in the proposed MO microstructure at 2.136 THz, and the isolation power of the device exceeds 55 dB with the insertion loss of −3.92 dB under a weak magnetic field of 0.2 T at room temperature of 300 K
We explored the nonreciprocal reflectance of MO microstructure in the applied magnetic field in the Voigt geometry
Summary
The rapid development of terahertz (THz) science and technology has a high impact on fundamental science and practical applications, such as security, imaging, spectroscopy, and wireless communications, among others [1,2,3,4]. Terahertz Surface Magneto-Plasmon back-reflected beam from reaching the laser source [13] Both methods of using ferrite isolators at microwave frequencies and Faraday isolators at the infrared regime are inappropriate for THz frequencies, so the THz nonreciprocal transmission principles still need to be investigated more deeply. Hu et al proposed a one-way device based on nonreciprocal surface magneto plasmons, and the oneway-propagating frequency band can be broadly tuned by the external magnetic fields, which can be used to realize various high performance tunable plasmonic devices such as isolators, switches, and splitters [23]. The results show that a high-performance THz optical isolator is achieved in the proposed MO microstructure at 2.136 THz, and the isolation power of the device exceeds 55 dB with the insertion loss of −3.92 dB under a weak magnetic field of 0.2 T at room temperature of 300 K
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