Patent ID: 7488940
Filing Date: 2009-02-10
Classification: G01N

Abstract:
1. A reflection-type terahertz spectrometer, comprising: an input optical path through which terahertz waves are propagated, an irradiating means which irradiates a sample with said terahertz waves propagated through said input optical path, an output optical path through which terahertz waves having been exiting from said irradiating means are propagated, a detecting means which receives and detects said terahertz waves propagated through said output optical path, and a polarization control means which controls polarization of said terahertz waves at said input optical path, wherein said irradiating means has at least one planar interface and a refractive index greater than that of a peripheral region contacting said planar interface and is disposed between said input optical path and said output optical path such that said terahertz waves propagated through said input optical path to be incident on said planar interface undergo total internal reflection at said planar interface, and said sample is disposed in said peripheral region contacting said planar interface of said irradiating means, and when said terahertz waves undergo said total internal reflection at said planar interface, said sample is irradiated with evanescent waves scattering from said planar interface to said peripheral region contacting said planar interface, so as to measure a spectrum.