Terahertz waves generator, terahertz waves detector, and terahertz - time domains - spectroscopy device

摘要

It is a terahertz waves generator is provided which, the following structural feature in a plane perpendicular to an optical propagation direction of an optical wave guide has. In particular, 0 r1 r2, wherein r1 a radius of curvature of a terahertz waves emission plane of a coupling member at a point a, on which a line, which extends from the optical waveguide in the direction perpendicular to a surface of a substrate, the terahertz waves emission plane of the coupling member and r2 a radius of curvature of a wave front of a terahertz wave at the same point a represents. In this case, r1 has a positive value when they have a convex shape in a propagation direction of the terahertz shaft is.