Abstract

We demonstrate a tunable reflection-type polarizer in the terahertz (THz) regime formed by inserting a monolayer phosphorene in a Fabry–Perot cavity composed of a metal substrate and a distributed Bragg reflector. The physical mechanism of the polarizer is analyzed through the reflection spectrum, the electric field distribution, the energy flow, and the power dissipation density calculated by transfer-matrix method and finite-difference time-domain method. The results show that the polarization-selected reflection is caused by the in-plane anisotropic absorption of the phosphorene due to its special atomic lattice, and the polarization selection is further enhanced by the cavity resonator. A polarized reflection light can be obtained with a polarizing extinction ratio of more than 20 dB and a total reflectivity around 50% in the designed THz frequency. The operation frequency of the polarizer can be tuned by the angle of the incident light, the doping electron concentration, and the uniaxial strains of the phosphorene. The refection-type polarizer provides many applications such as filters, detectors, and biosensors.

© 2019 Optical Society of America

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