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[Editors Pick] Current Optics and Photonics Vol. 6 no. 2 (2022 April)

사무국 hit 166 date 2022-04-25

Highly Birefringent Slotted-porous-core Photonic Crystal Fiber with Elliptical-hole Cladding for Terahertz Applications

Yong Soo Lee1, Soeun Kim2 *, and Kyunghwan Oh1 **

 

Current Optics and Photonics  Vol. 6 No.2 (2022 April) pp. 129-136
DOI: https://doi.org/10.3807/COPP.2022.6.2.129

  Fig. 1  Transverse cross section of the proposed photonic crystal fiber (PCF) design, and the extended view of the slotted porous core.

 

Keywords: High birefringence, Photonic crystal fiber, Terahertz
OCIS codes: (060.2280) Fiber design and fabrication; (060.5295) Photonic crystal fibers; (260.1440) Birefringence


Abstract
We propose a photonic crystal fiber (PCF) with a slotted porous core and elliptical-hole cladding, for high birefringence in the terahertz regime. Asymmetry in the guided mode is obtained mainly by using arrays of elliptical air holes in the TOPAS® polymer cladding. We investigate the tradeoff between several structural parameters and find optimized values that can have a high birefringence while satisfying the single-mode condition. The optical properties in the terahertz regime are thoroughly analyzed in numerical simulations, using a full-vector finite-element method with the perfectly-matched-layer condition. In an optimal design, the proposed photonic crystal fiber shows a high birefringence of 8.80 × 10−2 and an effective material loss of 0.07 cm−1> at a frequency of 1 THz, satisfying the single-mode-guidance condition at the same time. The proposed PCF would be useful for various polarization-management applications in the terahertz range.