Abstract
The terahertz frequency band bridges the molecular motions of dielectric relaxations and oscillatory, intermolecular motions. The terahertz time domain spectroscopy (THz-TDS) provides the solutions to observe optical properties in the terahertz frequency region. To understand the terahertz dynamics of glass formers, preliminary we demonstrate the aqueous solutions of well known glass formers, ethylene glycol, and propylene glycol. The frequency dependence of complex permittivity in the terahertz region is determined by dual thickness geometry. The dielectric constant of aqueous solutions shows clear concentration dependences. The combination of Cole-Davidson and Debye equations is applied to determine relaxation time and strength of main relaxation and the relaxation at terahertz region. The fast relaxation process can be attributed to the fast motions of OH moiety of water and glass forming materials.
