Abstract
Ordinary and extraordinary refractive indices of an crystal at terahertz (THz) frequencies are experimentally determined in this study. Fitting experimental data by THz time-domain spectroscopy (THz-TDS) and a Fourier transform infrared spectrometer (FTIR), we proposed revised complex dielectric functions and Sellmeier equations of GaSe for both ordinary and extraordinary waves from . Phonon vibrational modes and overtones in the THz frequency range are examined in detail. The high magnitude of the figure of merit ( at ), the large birefringence ( at ). and the low absorption coefficient ( at ) of GaSe are also identified. Potential applications to practical photonic devices such as phase shifters at THz frequencies are proposed.
© 2009 Optical Society of America
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