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Abstract
An antiresonant hollow core effective single-mode terahertz fiber is proposed and successfully fabricated with a photosensitive resin (SomosEvoLVe 128) by a 3D printer. The single mode characteristics of the fiber are found to be related to the area of the semielliptical tubes in the cladding. By optimizing the cladding structure parameters, a Higher Order Mode Extinction Ratio (HOMER) of above 6 can be achieved. A 30 cm long sample with optimized structural parameters is obtained by cascading two 15 cm long fiber samples fabricated by a 3D printer. The transmission loss and the electric field distribution are measured by a terahertz time domain spectroscopy (TDS) system. The electric field distribution measured at the output end of the fiber sample has the Gaussian profile, which accords with single-mode field distribution. Experimental results show that the average loss is 0.048 cm−1 within the frequency range from 0.2 to 1 THz, and the minimum loss is obtained as low as 0.009 cm−1 at the frequency of 0.82 THz.
Highlights
The use of terahertz radiation (0.1–10 THz) is undergoing the rapidly growth since terahertz systems are promising candidates for sensing, imaging, security, spectroscopy and communication [1]–[5]
In 2019, we proposed and successfully fabricated a pentagram terahertz hollow core fiber and a birefringent terahertz fiber based on an elliptical hollow core with a 3D printer [32], [33]
EXPERIMENTAL RESULTS AND DISCUSSION The fiber samples are measured by a homemade terahertz time-domain spectrometer
Summary
The use of terahertz radiation (0.1–10 THz) is undergoing the rapidly growth since terahertz systems are promising candidates for sensing, imaging, security, spectroscopy and communication [1]–[5]. S. Yang et al.: 3D Printed Effective Single-Mode Terahertz Antiresonant Hollow Core Fiber The transmission loss and the single-mode characteristics of the samples are measured by a terahertz time domain spectroscopy (TDS) system.
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