Patent ID: 8736838
Filing Date: 2014-05-27
Classification: G01J,G01N

Abstract:
1. A terahertz ellipsometer or polarimeter system sequentially comprising: a source (BWO) of terahertz electromagnetic radiation; a first rotatable polarizer (WGP a stage (STG) for supporting a sample (S); a second rotatable polarizer (WGP a detector (DET) of terahertz electromagnetic radiation; said terahertz ellipsometer or polarimeter system further comprising a first element (RE said terahertz ellipsometer or polarimeter system being characterized by said first element (RE such that in use said backward wave oscillator (BWO) directs a beam (BI) of terahertz frequency electromagnetic radiation of a fundamental frequency to pass through said first rotatable polarizer comprising a wire grid (WGP