Terahertz-wave generating element, terahertz-wave detecting element, and terahertz time-domain spectroscopy device

摘要

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

主权项

1. A terahertz-wave generating element comprising:
a waveguide including an electro-optic crystal; and an optical coupling member that guides a terahertz wave, which is generated from the electro-optic crystal as a result of pulsed light propagating through the waveguide, from the waveguide to a space, wherein the terahertz-wave generating element is of a Cerenkov phase-matching type, wherein the waveguide has a waveguide structure to confine the pulsed light in a first direction which is perpendicular to a propagation direction of the pulsed light and which the waveguide and the optical coupling member are arranged in and in a second direction which is perpendicular to the propagation direction and the first direction, and wherein, in the second direction, the waveguide is configured to confine the pulsed light in an area whose width is narrower than a width of the optical coupling member.