| abstract |
A terahertz ellipsometer, the basic preferred embodiment being a sequential system having a backward wave oscillator (BWO); a first rotatable polarizer that includes a wire grid (WGP 1 ); a rotating polarizer that includes a wire grid (RWGP); a stage (STG) for supporting a sample (S); a rotating retarder (RRET) comprising first (RP), second (RM 1 ), third (RM 2 ) and fourth (RM 3 ) elements; a second rotatable polarizer that includes a wire grid (WGP 2 ); and a Golay cell detector (DET). |