Abstract-Low-loss polarization-maintaining terahertz fiber based on central air hole movements

Zhiqing Wu, Qingzhi Li, Handing Xia; Zhaohua Shi,  Xiaoyan Zhou,  Qinghua Deng; Weidong Wu,

https://www.spiedigitallibrary.org/journals/Optical-Engineering/volume-57/issue-4/046113/Low-loss-polarization-maintaining-terahertz-fiber-based-on-central-air/10.1117/1.OE.57.4.046113.short?SSO=1

We report a type of single-hole core photonic crystal fiber for low-loss polarization-maintaining terahertz (THz) wave guidance. Simulation results show that high birefringence at a level of 10^−  2 can be obtained by a design of minor position adjustment of the central air hole. Low effective material loss can be achieved because of the introduced central air hole. The strategy of the central air hole movements is also applicable for the three-hole core THz photonic crystal fibers. Other transmission characteristics including single-mode condition, power fraction, confinement loss, and dispersion were discussed in detail. It is quite clear that the proposal facilitates the fabrication process due to the simple structure.

© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)

Abstract-Low-loss polarization-maintaining THz photonic crystal fiber with a triple-hole core

Zhiqing Wu, Xiaoyan Zhou, Handing Xia, Zhaohua Shi, Jin Huang, Xiaodong Jiang, and Weidong Wu

https://www.osapublishing.org/ao/abstract.cfm?uri=ao-56-8-2288&origin=search

In this paper, we report a novel low-loss and polarization-maintaining terahertz (THz) photonic crystal fiber with a triple-hole unit inside the core. The properties of birefringence, effective material loss, confinement loss, bending loss, power fraction, dispersion, and single-mode condition are analyzed in detail by using the finite element methods. Simulation results show that high birefringence at a level of 10−2${10}^{-2}$ can be achieved by simply reducing the diameter of one air hole of the triple-hole core. And low effective material loss down to 30% of its bulk material loss can be achieved in our interested band around 3 THz, due to the high core porosity of the designed triple-hole core. Moreover, this design dramatically facilitates the fabrication process, because of the typical hexagonal structure with all circular air holes and avoiding the troublesome multiple sub-wavelength air holes in the core area. The results reveal that this proposal has potential for efficient THz transmission and other functional applications.

© 2017 Optical Society of America