Abstract
THz time domain spectroscopy is a newly arising spectroscopic technique for evaluating refractive indexes and absorption coefficients of materials in THz(far infrared) region. Organic molecules posses low frequency vibrational and rotational absorption in this region. These absorptions can reflect the state of aggregation and the dynamical motion of molecules; accordingly THz spectroscopy can be a useful tool of studying molecular packing and motion in liquid crystal phases. We measured polarized THz spectra of MBBA and BBBA in nematic and isotropic phases to confirm the validity of THz spectroscopy in this field. Both materials show polarization dependence in their spectra at the nematic phase. These spectral features suggest the validity of this technique for studying liquid crystals.
