Patent ID: 7719673

Claim:
A defect inspection device comprising: a laser light source; an illumination optical system which controls light emitted from the laser light source; a sample support which holds a sample to be inspected; and a detection optical system which, when light emitted from the illumination optical system is irradiated to a surface of the sample to be inspected under an inspection condition, detects first scattering light scattered from an object on a surface of the sample including a foreign substance and a defect present on the surface and second scattering light scattered from surface roughness of the surface of the sample; wherein the detection optical system includes: a condensing part for condensing the first and second scattering light; a photoelectric converter for converting the first and second condensed scattering light into an electrical signal; and an analyzer disposed between the condensing part and the photoelectric converter and configured so as to be rotatable about an optical center axis of the detection optical system; a storage member which stores a database of analyzer angles in correspondence with inspection conditions including a direction of polarization, a direction of the detection, and a complex refractive index of a film material; a retrieval member which retrieves an inspection recipe including the inspection condition for the sample to be inspected; and an adjuster which adjusts the angle of the analyzer based upon the inspection recipe and the inspection condition of the sample retrieved by the retrieval member in accordance with the stored database which stores a relationship of each of inspection conditions and the angle of the analyzer stored by the storage member; and wherein the defect inspection device, based on the electrical signal at the adjusted angle of the analyzer, detects the foreign substance and the defect present on the surface of the sample to be inspected.