A Novel Low-Loss Diamond-Core Porous Fiber for Polarization Maintaining Terahertz Transmission

Abstract

We report on the numerical design optimization of a new kind of relatively simple porous-core photonic crystal fiber (PCF) for terahertz (THz) waveguiding. A novel twist is introduced in the regular hexagonal PCF by including a diamond shaped porous-core inside the hexagonal cladding. The numerical results obtained from an efficient finite element method (FEM) which confirms a high-birefringence of the order 10-2 and low effective material loss of 0.07 cm-1 at 0.7 THz operating frequency. The proposed PCF is anticipated to be useful in polarization sensitive THz appliances.

Hollow-core fiber with nested anti-resonant tubes for low-loss THz guidance

“…In particular, relatively low loss waveguides based on polymers such as PMMA [4], Teflon [5], HDPE [6], Zeonex [7] and Topas [3] have been investigated for use in the 1 THz region. Using these materials, various THz waveguides have been reported, including hollow core fibers [5,6], subwavelength fiber [8], porous-core fibers [9][10][11][12], and dielectric tube waveguide [13].…”

Rectangular Porous-Core Photonic-Crystal Fiber With Ultra-Low Flattened Dispersion and High Birefringence for Terahertz Transmission

“…Also, a near-zero ultra-flattened dispersion value of −0.01 ± 0.02 ps/THz/cm for the y-polarized mode and 0.2 ± 0.05 ps/THz/cm for the x-polarized mode can be obtained in the whole interesting frequency range from 1.1 to 2.0 THz for P = 30%. Compared to the reported THz-PCF in the literature [35][36][37][38][39][40][41][42][43][44][45][46][50][51][52][53], the proposed THz-PCF presents a near-zero ultra-flat dispersion over the widest frequency range of 1.1-2.0 THz with two zerodispersion points (1.06 THz and 1.74 THz). So D core = 378 µm and porosity = 30% is selected as optimal design parameters.…”

“…Therefore, greater attention is now focused on porous core fibers [2,[30][31][32][33][34][35][36][37][38][39][40] where the waveguide parameters such as core diameter, pitch size, air filling fraction, air hole radius, and frequency can be determined by design. Furthermore, it is possible to achieve low effective material loss (EML), low confinement loss, low dispersion variation, high birefringence, and high core power fraction in a PCF by selecting the geometrical parameters [41].…”

“…Furthermore, it is possible to achieve low effective material loss (EML), low confinement loss, low dispersion variation, high birefringence, and high core power fraction in a PCF by selecting the geometrical parameters [41]. A number of PCFs with high birefringence and low dispersion variation have been proposed in recent years [35][36][37][38][39][40][41][42][43]. For example, M. R. Islam et al proposed a novel fiber with a honeycomb-like cladding structure and a hexagonal slotted core, which had a high birefringence of 0.083 and a low confinement loss and an effective material loss of 10 −8 cm −1 and 0.095 cm −1 at an operating frequency of 1.5 THz, respectively [42].…”

Design of terahertz spectroscopy based optical sensor for chemical detection

“…Many communication areas and biological department are used to terahertz (THz) wave in the recent years properly. On the other hand, there are many sectors such as sensor [1], spectroscopy [2][3][4], polarization [5], defense [6] and astronomy [7] etc. are also used to THz frequency.…”