Abstract
A novel cyclic olefin copolymer (COC)-based polymer optical fiber (POF) with a rectangular porous core is designed for terahertz (THz) sensing by the finite element method. The numerical simulations showed an ultrahigh relative sensitivity of 89.73% of the x-polarization mode at a frequency of 1.2 THz and under optimum design conditions. In addition to this, they showed an ultralow confinement loss of 2.18 × 10−12 cm−1, a high birefringence of 1.91 × 10−3, a numerical aperture of 0.33, and an effective mode area of 1.65 × 105 μm2 was obtained for optimum design conditions. Moreover, the range dispersion variation was within 0.7 ± 0.41 ps/THz/cm, with the frequency range of 1.0–1.4 THz. Compared with the traditional sensor, the late-model sensor will have application value in THz sensing and communication.
Highlights
The characteristics of the wide-spectrum, strong-penetration, high-security terahertz (THz) wave have all-important applications in THz tomography [1,2], detection technology [3,4], biomedical sensing [5,6,7,8,9], THz communication [10,11], polarization maintenance [12,13,14], nondestructive testing [15], and other fields
The THz functional device is based on the waveguide structure and is the premise to realize various application functions
The THz fiber device based on porous-core fiber has special advantages [24,25,26,27,28,29,30]
Summary
The characteristics of the wide-spectrum, strong-penetration, high-security terahertz (THz) wave have all-important applications in THz tomography [1,2], detection technology [3,4], biomedical sensing [5,6,7,8,9], THz communication [10,11], polarization maintenance [12,13,14], nondestructive testing [15], and other fields. For the complex structure of a POF-based THz sensor, the transmission characteristics of THz-PCFs are usually studied by the full-vector finite element method (FV-FEM) [49,50,51], the plane-wave method [52,53], an improved effective index method [54,55], the finite difference time domain method [56,57], the beam propagation method [58,59,60], and the multi-pole method [61,62,63] Among these methods, the FV-FEM is best suited for calculating the transmission characteristics of optical fibers. It can be predicted that the ultrahigh relative sensitivity TOPAS® -based THz sensor has vast potential in the field of THz transmission and sensing
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