Abstract
Based on the polarization-sensitive terahertz time-domain spectroscopy, we measured the birefringence for and single crystals, which correspond to trigonal structures that have an uniaxial birefringence, in the THz frequency range of 0.25 to . For more comprehensive understanding of the THz birefringence, the measured birefringence is compared with the results of ab initio calculations. The measured birefringence shows good agreement with the calculated value.
© 2011 Optical Society of America
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