Extruded TOPAS hollow-core anti-resonant fiber optimized for THz guidance at 0.9THz

Abstract

A hollow-core anti-resonant fiber for the THz regime is proposed and demonstrated. The proposed fiber is the hexagonal core shape which is directly extruded using a conventional 3D printer. Experimental results show that by using cyclic olefin copolymer (COC), the proposed fiber design provides a low attenuation of ∼3 dB∕m at ∼ 0.86 THz and ∼15 dB∕m at ∼ 0.42 THz.

The design of polarization-maintaining and polarization-filtering hollow core with nested anti-resonance nodeless fiber for THz guidance

“…The fiber designed in this work can be fabricated by a 3D printing system if a nozzle for the fiber extrusion is developed. This should be confirmed by other work [26] in which an anti-resonant fiber with a comparable dimension was fabricated. Furthermore, our proposed fiber has a higher birefringence and potential to be used in the polarization-filtering applications.…”

“…Topas copolymer was selected to use as the fiber material in this work mainly because of its lower material loss than other materials operating in the THz range. Also, a commercial availability of Topas filaments from venders makes the fiber fabrication process by 3D printing system much more convenient [25,26]. The refractive index (n) of Topas is 1.5258 in the 0.1 THz-1.5 THz range.…”

Ultra-High Sensitivity Terahertz Microstructured Fiber Biosensor for Diabetes Mellitus and Coronary Heart Disease Marker Detection

“…For the length of terahertz MSF, 50 mm~100 mm is usually set as appropriate. If the fiber length is too low, the number of terahertz wave oscillations inside the fiber is too few to form a stable mode field distribution, and at the same time, it will enhance the difficulty of experimental operation; if the MSF length is too long, the MSF biosensor may face problems such as output signal attenuation, sensitivity to bending loss, and more likelihood of fiber defects during the manufacturing process [ 20 , 34 , 35 ].…”

“…Compared with other traditional techniques for fiber preparation, this technique simplifies the fiber prefabrication and enables precise manufacturing of MSF structures with large duty cycles [ 35 ]. In recent years, by continuously optimizing MSF end face design and 3D printing fabrication schemes, the prepared fibers have achieved low-loss operating performance over a wide frequency range [ 34 ]. Therefore, 3D printing and extrusion technologies show great promises for high-quality, flexible MSF preparations in the future.…”

Research on hollow-core terahertz fiber based on Bragg anti-resonant elements arranged in a hexagonal structure

“…Experimental results demonstrate that the transmission loss of the THz HC-ARF is 0.12cm -1 at 0.39THz. Phanchat et al [16] proposed a THz HC-ARF, which is directly extruded using a conventional 3D printer. Experimental results show that the proposed fiber exhibits low losses of ~3 dB/m at ~ 0.86 THz and ~ 15 dB/m at ~ 0.42 THz.…”