A single mode porous-core square lattice photonic crystal fiber for THz wave propagation

Abstract

Background: Interests on low-loss terahertz (THz) waveguides are increasing due to their remarkable applications in various fields. Since most the materials are highly absorbent to THz waves therefore it is an ongoing challenge to obtain a low-loss waveguide. This paper presents a novel porous-core square lattice photonic crystal fiber (PCF) for efficient transmission of THz waves. Methods: The guiding properties of the proposed fiber are characterized by using finite element method (FEM) with circular perfectly matched layer (PML) boundary conditions. Results: It is demonstrated that the designed PCF shows very low effective material loss (EML) of 0.076 cm-1 at 1.0 THz that indicates about 62 % reduction of bulk absorption loss of the background material. In addition to this, the proposed fiber exhibits low confinement loss of 8.96 × 10-3 dB/cm and low flattened dispersion of 0.96 ± 0.086 ps/THz/cm for the optimal design parameters. Other important propagation characteristics such as single mode propagation, power fraction, and bending loss are also investigated thoroughly. Conclusions: A porous-core PCF is an efficient mechanism for the transmission of THz waves. The proposed low-loss and low-dispersion PCF can find numerous applications in THz regime.

Hybrid porous‐core microstructure terahertz fibre with ultra‐low bending loss and low effective material loss

“…The wave propagation in porous‐core MOF is mainly limited by the EML, which can be computed by the following expression [11, 12]: where ɛ 0 and µ 0 are the permittivity and permeability in vacuum, n is the refractive index of TOPAS, E is the electric field component, and S z is the z‐component of the Poynting vector.…”

“…Another porous‐core MOF was reported by Chen et al [10] having an EML of 0.1 cm −1 and a confinement loss of 1.7 dB/cm at 1.0 THz. The MOF demonstrated in [11] showed a low EML of 0.076 cm −1 and a low confinement loss of 8.96 × 10 −3 dB/cm at 1.0 THz. Besides, a porous‐core spiral MOF has been proposed by the authors, which showed a low EML of 0.085 cm −1 and a low confinement loss of about 1.91 × 10 −3 dB/cm at 1.0 THz [12].…”

Design of terahertz spectroscopy based optical sensor for chemical detection

“…Zeonor is used as the background material of the reported RH-CPCF sensor. To compare with recent published articles [22][23][24][25][26][27][28][29][30][31][32][33][34], the proposed RH-CPCF shows the better performance of sensitivity and confinement loss are 76.44%, 77.16%, 73.20% and 2.33 × 10 −03 dB/m, 3.07 × 10 −06 dB/m, 2.84 × 10 −02 dB/m for ethanol, benzene and water respectively at 1 THz frequency. So, this suggested RH-CPCF is highly useful in biomedicine and industrial chemicals research for sensing applications in the terahertz frequency range.…”

A Novel Hexahedron Photonic Crystal Fiber in Terahertz Propagation: Design and Analysis

“…In 2014, Rana et al [15] suggested octagonal lattice PCF and gained EML of 0.05 cm −1 and core power of 40% at 1 THz. In 2016, Hasan et al [16,17] reported hexagonal and square lattice PCFs which gained EML of 0.089 cm −1 and 0.076 cm −1 , respectively. However, core power fraction was very low and did not mention some crucial parameters.…”