TERAHERTZ-WAVE GENERATING ELEMENT, TERAHERTZ-WAVE DETECTING ELEMENT, AND TERAHERTZ TIME-DOMAIN SPECTROSCOPY DEVICE

摘要

A terahertz - wave generating element comprises an electro - optic crystal that includes an optical waveguide; an optical coupling member (7) that extracts a terahertz wave, which is generated from the electro - optic crystal as a result of light propagating through the waveguide, to space; and at least two electrodes (6a, 6b) that cause a first - order electro - optic effect in the electro - optic crystal (1) by applying an electric field to the waveguide (4) so as to change a propagation state of the light propagating through the waveguide. A crystal axis of the electro - optic crystal (1) is set such that the terahertz wave generated by a second - order nonlinear optical process and the light propagating through the waveguide (4) are phase - matched.