Hollow-core photonic crystal fibers for efficient terahertz transmission

Increasing applications of terahertz (THz) waves require design and fabrication of new waveguides with low transmission loss in THz region (0.1 similar to 10 THz). Hollow-core photonic crystal fibers (HC-PCFs) with their unique characteristics hold great promise for efficient THz transmission. Hence, in this article, HC-PCFs are designed and simulated based on the finite-difference-time-domain (FDTD) method to efficiently transmit THz radiation. Impacts of structural parameters such as background material, core diameter, air-hole rings and filling factor on the THz transmission window of HC-PCFs are investigated. The results show that as the number of air-hole rings and the core diameter are increased the transmission loss is decreased. Also, the suitable HC-PCF in the transmission window of 1.55-1.85 THz with simultaneously good dispersion properties is obtained when the background material is Teflon.