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

Hadjiloucas, S. and Galvao, R. K. H. and Bowen, J. W. and Martini, R. and Brucherseifer, M. and Pellemans, H. P. M. and Bolivar, P. H. and Kurz, H. and Digby, J. and Parkhurst, G. M. and Chamberlain, J. M. (2003) 'Measurement of propagation constant in waveguides with wideband coherent terahertz spectroscopy.', Journal of the Optical Society of America B : optical physics., 20 (2). pp. 391-401.


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.

Item Type:Article
Keywords:Optical devices, Waveguides, Spectroscopy, Far infrared, Thin films, Ultrafast optics, Pulse shaping, Microwaves.
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Publisher statement:© Copyright 2003 Optical Society of America.
Record Created:04 Jan 2007
Last Modified:10 Nov 2010 12:08

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