| abstract |
An ellipsometer that operates in a terahertz frequency band. An embodiment of this ellipsometer, which is a basic and preferred system, sequentially comprises a backward wave oscillator (BWO); a first rotatable wire grid polarizer (WGP1); a first rotor (RE1). (Rotating wire grid polarizer (RWGP)); Stage (STG) for supporting sample (S); Second rotor (RE2) (first (RP), second (RM1), third ( RM2), and a rotating retarder (RRET) configured with a fourth (RM3) reflective element; a second rotatable wire grid polarizer (WGP2); and a Golay cell detector (DET) Yes. [Selection] Figure 1 |