Exploring Low Loss and Single Mode in Antiresonant Tube Lattice Terahertz Fibers

Brian Wai-Him Ng,Alex Dinovitser,Md Selim Habib,Jakeya Sultana,Cristiano M B Cordeiro,Md Saiful Islam,Derek Abbott

doi:10.1109/access.2020.3003035

Brian Wai-Him Ng, Alex Dinovitser + Show 5 more

Open Access

https://doi.org/10.1109/access.2020.3003035

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Abstract

We propose and numerically analyze various hollow-core antiresonant fiber (HC-ARF) for operation at terahertz frequencies. We compare typical HC-ARF designs with nested and adjacent nested designs while analyzing performance in terms of loss and single-mode guidance of terahertz waves. With optimized fiber dimensions, the fundamental core mode, cladding mode, core higher-order modes (HOMs), and the angle dependence of adjacent tubes are analyzed to find the best design for low loss terahertz transmission. Analysis of the fiber designs shows that the nested tube-based antiresonant fiber exhibits lower transmission loss and superior HOM suppression, exceeding 140. The nested HC-ARF is feasible for fabrication using existing fabrication technologies and opening up the possibility of efficient transmission of terahertz waves.

Highlights

Lying midway between the microwave and visible light, the terahertz spectrum offers significant potential in the field of sensing, security, label-free molecular detection, hybridization of DNA, pharmaceutical drug testing, spectroscopy and short-range high-speed communications [1]–[8]
We carry out the observation on typical, nested, and adjacent nested hollow-core antiresonant fiber designs to determine the optimal waveguide structure for low loss and broad bandwidth terahertz transmission
HIGHER-ORDER MODE EXTINCTION RATIO the modal properies of hollow-core antiresonant fiber (HC-ARF) are numerically analyzed with a fixed Dc, while the cladding tube diameter is varied over a range where the higher-order modes (HOMs) are suppressed at f = 1 THz

Summary

Introduction

Lying midway between the microwave and visible light, the terahertz spectrum offers significant potential in the field of sensing, security, label-free molecular detection, hybridization of DNA, pharmaceutical drug testing, spectroscopy and short-range high-speed communications [1]–[8].

Results

Conclusion