Low-Loss THz Waveguide Bragg Grating using a Two-Wire Waveguide and a Paper Grating

TL;DR

This paper introduces a novel low-loss THz waveguide Bragg grating using a plasmonic two-wire waveguide combined with a micromachined paper grating, demonstrating promising performance for THz communication applications.

Contribution

It presents a new fabrication method for low-loss THz waveguide Bragg gratings using a two-wire waveguide and paper grating, with detailed experimental and numerical analysis.

Findings

Achieved 17 dB and 14 dB loss at specific THz frequencies

Measured insertion loss of 1-4 dB across 0.1-0.7 THz

Confirmed low-loss, high-efficiency operation through numerical studies

Abstract

We propose a novel kind of the low-loss THz Waveguide Bragg Grating (TWBG) fabricated using plasmonic two-wire waveguide and a micromachined paper grating for potential applications in THz communications. Two TWBGs were fabricated with different periods and lengths. Transmission spectra of these TWBGs show 17 dB loss and 14 dB loss in the middle of their respective stop bands at 0.637 THz and 0.369 THz. Insertion loss of 1-4 dB in the whole 0.1-0.7 THz region was also measured. Finally, TWBG modal dispersion relation, modal loss and field distributions were studied numerically, and low-loss, high coupling efficiency operation of TWBGs was confirmed.