Monday, 16 April 2012

SPIE Defense, Security and Defense meeting (23 - 27 April 2012)

SPIE Defense, Security, and Sensing

TeraView customers present their recent research at the SPIE Defense, Security and Defense meeting 23 - 27 April 2012, Baltimore Convention Center Baltimore, Maryland United States

Terahertz properties of single-crystal

 ferroelectric and dielectric materials 


Paper 8363-5 of Conference 8363
Date: Monday, 23 April 2012

Author(s): S. K. Sundaram, New York State College of Ceramics at Alfred Univ. (United States); R. J. Koch, Alfred Univ. (United States); John S. McCloy, Pacific Northwest National Lab. (United States)
Frequency dependence of complex permittivity of selected ferroelectric and dielectric single crystals and ceramics has been measured in the terahertz (THz) region using time-domain THz spectroscopy. This has been accomplished by measuring transmittance through the samples over a broad range of about 300 GHz to about 4THz in our laboratory. Samples include crystals of BaTiO3, SrTiO3, LiNbO3, LiTaO3, LaAlO3, and Bi4Ge3O12 and a polycrystalline ceramics of (PbMg1/3Nb2/3O3)0.73-(PbTiO3)0.27. We have compared our results with millimeter wave (MMW), RF, microwave, and optical frequency permittivities of these materials. Effects of crystallographic orientations on the dielectric properties have also been examined. Our results demonstrate that dielectric properties of these materials in the THz region correlate well with data obtained in other spectral regions, thereby expanding available data to a wider range of the electromagnetic spectrum.



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