Author = {Higgins, James Alexander},
	School = {Portland State University},
	Title = {Measurement and Simulation of Parallel Plate Waveguide Structures in the Terahertz Region for Sensing and Material Characterization Applications},
	Keywords = {Parallel plate waveguide, Terahertz, FDTD simulation, Electromagnetics, Multimode characterization},
	Dc.Identifier = {},
	Dc.Language = {en_US},
	Abstract = {The THz region is a burgeoning field of research with applications in spectroscopy, integrated circuit fabrication, bio-medicine, and communications. Until recently, the THz region was largely unexplored, mainly due to the technical difficulties involved in making efficient and compact sources and detectors. As these challenges are addressed, the focus of research has shifted to practical applications, such as sensing and imaging.

The focus of this thesis is to investigate the characterization of parallel plate waveguide multimode propagation and periodically notched resonant structures for use in sensing and material parameter extraction applications. Broadband and narrowband measurements are presented and analyzed. Measurements are compared to finite difference time domain simulations and analytic solutions that use a Fourier transform mode-matching technique. Agreement is observed between simulation and measurement of radiation patterns. Weighted estimates of individual mode analytic solutions produce equivalent radiation patterns, which allows insight into the energy coupled into each respective mode. Results show that higher order modes contribute both a greater conductive attenuation and higher coupling loss. Agreement is also observed between measurements and simulated single and periodically notched resonant structures. Results demonstrate shifting of the resonant peak with respect to changes in plate separation for the periodically notched structure. For the single notch resonator, simulations indicate the resonant peak is dependent on notch depth until the depth-to-width ratio is greater than two.

This work demonstrates that multimode propagation can be identified and the amount of energy coupled into each mode may be estimated using radiation patterns. Experiments using quasi-optical time domain spectroscopic and continuous wave vector network analyzer systems in the THz region have been demonstrated. Finite difference time domain simulations have validated measurements on both systems. The results presented will advance the field of THz research by aiding in the design and analysis of sensing and material parameter extraction systems}}
	Author = {A. Higgins and B. Pejcinovic and C. Cowen and F. Kernan},
	Date-Added = {2012-03-26 06:30:42 +0000},
	Date-Modified = {2012-03-26 06:44:13 +0000},
	Doi = {10.1117/12.884417},
	Journal = {SPIE Proceedings},
	Number = {1},
	Pages = {802310--802310-13},
	Title = {An investigation of parallel plate waveguide terahertz radiation input coupling},
	Volume = {8023},
	Year = {2011},
	Bdsk-Url-1 = {}}
	Author = {J. A. Higgins and F. Kernan and Branimir Pejcinovic},
	Bibsource = {DBLP,},
	Booktitle = {MIPRO},
	Crossref = {DBLP:conf/mipro/2011},
	Date-Added = {2012-03-26 06:48:13 +0000},
	Date-Modified = {2012-03-26 06:48:41 +0000},
	Ee = {},
	Pages = {118-123},
	Title = {Application of open-source MEEP software to Terahertz radiation waveguide problems},
	Year = {2011}}
	Abstract = {Parallel-plate waveguide sensors are investigated by characterizing TM and TE modes when filled with inhomogeneous and homogeneous samples. Effects of multi-mode TE propagation within PPW and radiation patterns are investigated. Lactose detection is demonstrated by TDS and CW-VNA techniques.},
	Author = {Kernan, F. and Wachsmuth, M. and Higgins, J. and Pejcinovic, B. and Zurk, L. and Campbell, R.},
	Booktitle = {Infrared Millimeter and Terahertz Waves (IRMMW-THz), 2010 35th International Conference on},
	Date-Added = {2012-03-26 06:46:03 +0000},
	Date-Modified = {2012-03-26 06:46:30 +0000},
	Doi = {10.1109/ICIMW.2010.5612438},
	Keywords = {CW-VNA technique;inhomogeneous sample;lactose detection;parallel plate waveguide mode;parallel plate waveguide sensor;radiation patterns;terahertz sensing;transverse electric mode;transverse magnetic mode;radiowave propagation;spectrochemical analysis;terahertz wave detectors;},
	Month = {{sept.}},
	Pages = {1 -2},
	Title = {Utilizing parallel plate waveguide modes for terahertz sensing},
	Year = {2010},
	Bdsk-Url-1 = {}}
	Author = {Higgins, A. and Kernan, F. and Pejcinovic, B.},
	Booktitle = {Microwave Measurement Symposium (ARFTG), 2010 76th ARFTG},
	Date-Added = {2012-03-26 06:42:41 +0000},
	Date-Modified = {2012-03-26 06:44:36 +0000},
	Doi = {10.1109/ARFTG76.2010.5700063},
	Keywords = {Fourier transform mode-matching technique;broadband measurement;conductive attenuation;field pattern measurement;finite difference time domain simulation;material parameter extraction;multimode characterization;multimode propagation;narrowband measurement;parallel plate waveguide;Fourier transforms;electric field measurement;finite difference time-domain analysis;mode matching;parallel plate waveguides;parameter estimation;submillimetre wave measurement;},
	Month = {30 2010-dec. 3},
	Pages = {1 -5},
	Title = {Multimode characterization of parallel plate waveguide},
	Year = {2010},
	Bdsk-Url-1 = {}}