Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Terahertz waveguides

Not Accessible

Your library or personal account may give you access

Abstract

Quasi-optical techniques are used to efficiently couple freely propagating pulses of terahertz (THz) electromagnetic radiation into circular and rectangular metal waveguides. We have observed very dispersive, low-loss propagation over the frequency band from 0.65 to 3.5 THz with typical waveguide cross-section dimensions on the order of 300 µm and lengths of 25 mm. Classical waveguide theory is utilized to calculate the coupling coefficients into the modes of the waveguide for the incoming focused THz beam. It is shown that the linearly polarized incoming THz pulses significantly couple only into the TE11, TE12, and TM11 modes of the circular waveguide and the TE10 and TM12 modes of the rectangular guide. The propagation of the pulse through the guide is described as a linear superposition of the coupled propagating modes, each with a unique complex propagation vector. This picture explains in detail all the observed features of the THz pulse emerging from the waveguide. We demonstrate both theoretically and experimentally that it is possible to achieve TE10 single-mode coupling and propagation in a suitably sized rectangular waveguide for an incoming focused, linearly polarized THz pulse with a bandwidth covering many octaves in frequency and that overlaps more than 35 waveguide modes. Finally, to facilitate the application of these THz waveguides to THz time-domain spectroscopy of various configurations of dielectrics in the waveguide including surface layers, we present analytic results for the absorption and the dispersion of such layers.

© 2000 Optical Society of America

Full Article  |  PDF Article
More Like This
Propagation of ultrawideband short pulses of terahertz radiation through submillimeter-diameter circular waveguides

R. W. McGowan, G. Gallot, and D. Grischkowsky
Opt. Lett. 24(20) 1431-1433 (1999)

Undistorted guided-wave propagation of subpicosecond terahertz pulses

R. Mendis and D. Grischkowsky
Opt. Lett. 26(11) 846-848 (2001)

Modes in silver-iodide-lined hollow metallic waveguides mapped by terahertz near-field time-domain microscopy

Miguel Navarro-Cia, Carlos M. Bledt, Miriam S. Vitiello, Harvey E. Beere, David A. Ritchie, James A. Harrington, and Oleg Mitrofanov
J. Opt. Soc. Am. B 30(1) 127-135 (2013)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (13)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (48)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved