Patent ID: 9581498
Date: 2017-02-28
CPC Classifications: G01J,G01N

Claim:
1. A rotating-element spectroscopic ellipsometer, comprising: a light source radiating an incident light toward a sample; a polarization state generator disposed between the light source on a traveling path of the incident light and the sample and controlling a polarized state of the incident light radiated from the light source; a polarization state analyzer receiving reflected light or transmitted light having a changed polarization state while the incident light is polarized by passing through the polarization state generator and then reflected or transmitted by the sample and analyzing a change in the polarization state of the reflected light or transmitted light; a photodetector element receiving the reflected light or the transmitted light passing through the polarization state analyzer and measuring irradiance of the incident light with an electrical signal of a voltage or a current; and a processor operable for calculating measurement precision of the rotating-element spectroscopic ellipsometer based on a theoretical equation on standard deviations of ellipsometric parameters for the sample, wherein the theoretical equation on the standard deviations σ( wherein, represent X=(X wherein a plurality of rotatable elements are disposed in the polarization state generator or the polarization state analyzer and the rotatable element includes a constantly rotating element rotating at a uniform velocity and a scanning element.