Measurement of propagation constant in waveguides with wideband coherent terahertz spectroscopy

Sillas Hadjiloucas, Roberto K.H. Galvão, John W. Bowen, Rainer Martini, Martin Brucherseifer, Harm P.M. Pellemans, Peter Haring Bolívar, Heinrich Kurz, John Digby, Geoffrey M. Parkhurst, J. Martyn Chamberlain

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13 Scopus citations

Abstract

A quasi-optical technique for characterizing micromachined waveguides is demonstrated with wideband time-resolved terahertz spectroscopy. A transfer-function representation is adopted for the description of the relation between the signals in the input and output port of the waveguides. The time-domain responses were discretized, and the waveguide transfer function was obtained through a parametric approach in the z domain after describing the system with an autoregressive with exogenous input model. The a priori assumption of the number of modes propagating in the structure was inferred from comparisons of the theoretical with the measured characteristic impedance as well as with parsimony arguments. Measurements for a precision WR-8 waveguide-adjustable short as well as for G-band reduced-height micromachined waveguides are presented.

Original languageEnglish
Pages (from-to)391-401
Number of pages11
JournalJournal of the Optical Society of America B: Optical Physics
Volume20
Issue number2
DOIs
StatePublished - Feb 2003

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