Tuesday, January 5, 2016
Abstract-Polarization-sensitive electro-optic detection of terahertz wave using three different types of crystal symmetry: Toward broadband polarization spectroscopy
We investigated polarization-sensitive electro-optic (EO) detection of terahertz (THz) by using two uniaxial crystals: a -cut gallium selenide and a -cut lithium niobate crystals. We formulated a general frequency-domain description of EO detection by in-plane isotropic EO crystals, which holds regardless of the frequency. Based on this description, the of THz can be derived by analyzing EO sampling signals measured with two orthogonal configurations of the in-plane isotropic EO crystals as well as typical (111) zinc-blende EO crystals. In addition, we experimentally demonstrated that the frequency-dependent of THz can be reproducibly retrieved using three EO crystals with different and with different phase matching conditions. Our description provides essential information for practical sensing in the THz frequency range as well as in the mid-infrared range.