Polarization-preserving teflon photonic crystal fiber waveguide for THz radiation

Using a highly flexible plastic material, teflon, photonic crystal fiber (PCF) waveguide for THz radiation is constructed. A solid rod of this material is used as core and hollow tubes as air clad. The PCFs are fused together without the need of furnace heating thereby making it simple and easy to fabricate. It is found that such PCF possesses strong polarization-preserving property. With such feature, coupled with relatively low-loss coefficient, the possibility of preparing long PCF waveguide in the THz region can be easily attained.