Wideband dispersion-free THz waveguide platform
David Rohrbach, Bong Joo Kang, Elnaz Zyaee, Thomas Feurer

TL;DR
This paper introduces a low-loss, dispersion-free THz waveguide platform with strong field confinement, enabling advanced spectroscopy and nonlinear interactions across 0.1 to 1.5 THz frequencies.
Contribution
It presents a novel metallic double ridged waveguide design that achieves vacuum-like dispersion and strong mode confinement for integrated THz applications.
Findings
Low propagation and bending losses measured
Successful demonstration of junctions and interferometers
Broadband single- to few-cycle pulse propagation
Abstract
We present an integrated THz spectroscopy and sensing platform featuring low loss, vacuum-like dispersion, and strong field confinement in the fundamental mode. Its performance was characterized experimentally for frequencies between 0.1 THz and 1.5 THz. While linear THz spectroscopy and sensing gain mostly from low loss and an extended interaction length, nonlinear THz spectroscopy would also profit from the field enhancement associated to strong mode confinement. Moreover, the vacuum-like dispersion allows for a reshaping-free propagation of broadband single- to few-cycle pulses in gas-phase samples or velocity matching between THz pump and visible to infrared probe pulses. Our platform is based on a metallic structure and falls in the category of double ridged waveguides. We characterize essential waveguide properties, for instance, propagation and bending losses, but also…
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Taxonomy
TopicsTerahertz technology and applications · Gyrotron and Vacuum Electronics Research · Spectroscopy and Laser Applications
