A single-polarization hollow-core anti-resonant fiber based on epsilon-near-zero (ENZ) material in terahertz region

A single-polarization hollow core anti-resonant fiber (HC-ARF) in terahertz (THz) region is pro-posed. The excellent single-polarization behavior is achieved by optimizing material parameters. Meanwhile, the single polarization behavior further improved by introducing epsilon-near-zero (ENZ) material into high resistance silicon tubes. The ENZ tubes enlarge the polarization extinction ratio (PER) and improve birefringence greatly. Moreover, optimization of the config-uration parameters is conducted to obtain high PER and birefringence at 1 THz. The proposed single-polarization HC-ARF has great potential applications in the field of polarization sensitive communication, sensors in THz band.