Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Highly Birefringent Slotted-porous-core Photonic Crystal Fiber with Elliptical-hole Cladding for Terahertz Applications

  • Lee, Yong Soo (Department of Physics, Yonsei University) ;
  • Kim, Soeun (Integrated Optics Laboratory, Advanced Photonic Research Institute, Gwangju Institute of Science and Technology) ;
  • Oh, Kyunghwan (Department of Physics, Yonsei University)
  • Received : 2021.12.14
  • Accepted : 2022.02.21
  • Published : 2022.04.25
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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.

Keywords

Acknowledgement

National Research Foundation of Korea (NRF 2018R1D1A1B07049349); National Research Foundation of Korea (NRF 2019R1A2C2011293).

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