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Measurement of propagation constant in waveguides with wideband coherent terahertz spectroscopy.

By S. Hadjiloucas, R. K. H. Galvao, J. W. Bowen, R. Martini, M. Brucherseifer, H. P. M. Pellemans, P. H. Bolivar, H. Kurz, J. Digby, G. M. Parkhurst and J. M. Chamberlain

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

Topics: Optical devices, Waveguides, Spectroscopy, Far infrared, Thin films, Ultrafast optics, Pulse shaping, Microwaves.
Publisher: Optical Society of America
Year: 2003
DOI identifier: 10.1364/JOSAB.20.000391
OAI identifier: oai:dro.dur.ac.uk.OAI2:1554
Journal:

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