Patent ID: 8009292

Claim:
An ellipsometer comprising: a light source ( 210 ); a beam splitting part ( 220 ) for splitting a light generated in the light source ( 210 ) into a polarized light; an objective lens ( 230 ) for concentrately irradiating some of light split by the beam splitting part ( 220 ) onto a specimen ( 240 ); a photodetector ( 250 ) for detecting the light passed through the objective lens 230 and the beam splitting part ( 220 ) after reflected from the specimen ( 240 ) with a plurality of unit cells; and a central processing unit ( 260 ) which acquires values measured in the plurality of unit cells corresponding to different azimuthal angles for a same circumference at a predetermined radius to take polarization components for multiple incident surfaces of 360° in a static state to acquire a measurement value based on a change in polarization direction of light incident on the surface of the specimen.