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Terahertz tunable filter and modulator based on magneto plasmon in transverse magnetized InSb

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Abstract

The transverse magneto-optical (MO) effect of InSb has been theoretically and experimentally investigated in the terahertz (THz) regime. The calculated photonic band structure and experimental measurements show that a unique circularly polarized magneto plasmon mode, and a linearly polarized transverse magnetic mode can be sensitively manipulated by a weak magnetic field. Moreover, these results indicate that transverse magnetized InSb can be used as a THz tunable high-pass filter and a MO modulator. The cutoff frequency of the filter can be broadly tuned from 0.4 to 0.8 THz when the magnetic field changes from 0 to 0.22 T, and the modulation depth of 20 dB can be obtained. This research has significance for the deep understanding to the THz MO effect of InSb and promotes the development of THz MO devices.

© 2019 Optical Society of America

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