Air-core terahertz fiber with high birefringence

Jing Li; Haibin Chen; Zhi Hong

doi:10.1117/12.869713

4 November 2010 Air-core terahertz fiber with high birefringence

Jing Li, Haibin Chen, Zhi Hong

Proceedings Volume 7854, Infrared, Millimeter Wave, and Terahertz Technologies; 78542T (2010) https://doi.org/10.1117/12.869713
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

In this paper, we propose an efficient air-core Terahertz (THz) fiber with high birefringence and low modal absorption loss. The photonic crystal fiber has a triangular-lattice with circular subwavelength air-holes in the microstructured cladding and elliptical subwavelength air-holes in the core. In this structure, the effective index of the core is above that of the cladding, which leads to a better confinement of the field and ensures the low loss characteristic for THz guiding. With elliptical air-holes in the core, the proposed THz fiber exhibits high birefringence. The background medium is the polymer material with low absorption in THz region. The proposed design has been simulated based on the finite element method with anisotropic perfectly matched layers (PML) absorbing boundary condition. Numerical simulations show that with a moderate ellipticity of the elliptical air-holes in the core region, the proposed THz fiber can exhibit high birefringence on a level of 10^-2 in a 0.2THz to 2.0THz frequency range. And the THz fiber's guiding loss caused by material absorption can be reduced effectively by the addition of more air holes in the core region.

Citation Download Citation

Jing Li, Haibin Chen, and Zhi Hong "Air-core terahertz fiber with high birefringence", Proc. SPIE 7854, Infrared, Millimeter Wave, and Terahertz Technologies, 78542T (4 November 2010); https://doi.org/10.1117/12.869713

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