A Comparative Analysis between Low Loss Kagome Structured THz Hollow Core and Porous Core PCF

Abstract

This paper presents a comparative study between
a porous core kagome lattice photonic crystal fiber (PCF) and a
air filled Hollow core kagome lattice PCF (HC-PCF), which acts
as a low loss and polarization maintaining tera hertz (THz)
waveguide. Proposed PCFs are simulated using finite element
method (FEM), including the effective material loss (EML),
confinement loss and single mode propagation. Cyclic olefin
copolymer, also known as TOPAS material have been chosen for
the air micro structured inhibited coupled design of PCF which
has the lowest bulk material absorption loss of 0.2 cm-1.
Expressions are given to asses this optimization and the result are
shown for the variation of core diameter from 425 µm to 600 µm
for both the Hollow core and porous core PCFs and for the
comparison with porous core the optimized porosity taken as
60% and 70% along with the frequency of 1THz. The analysis
results approximately 80% to 90% improvement in losses in case
of passing THz waves through HC-PCF rather than Porous core
PCF. By varying core parameter such as core porosity and core
diameter and strut width at 1THz, the goal is to show an
optimized solution consisting of low EML and confinement loss
for both of the wave guidance and comparing the results to
analyze and hence finding out a better solution.