Abstract: A defect inspection device includes: an illumination optical system including a polarization element configured to switch polarization of irradiation light between first polarization and second polarization orthogonal to the first polarization; a polarization diffraction grating configured to emit diffraction light of a specific order of the irradiation light in a direction along a normal line of a sample stage surface, a diffraction efficiency of the specific order of the first polarization of the irradiation light is equal to or less than 20% of a diffraction efficiency of the specific order of the second polarization, the polarization diffraction grating being settable at a light collection position of the irradiation light on the sample stage surface and including an anisotropic pattern whose period is equal to or less than twice a wavelength of the irradiation light; a detection optical system.

Abstract: A defect inspection device in which an optical axis of a detection optical system is inclined with respect to a surface of a sample, and an imaging sensor is inclined with respect to the optical axis, a height variation amount of an illumination spot in a normal direction of the surface of the sample is calculated based on an output of a height measuring unit, a deviation amount of the focusing position with respect to the light receiving surface in an optical axis direction of the detection optical system is calculated based on the height variation amount of the illumination spot, the deviation amount of the focusing position being generated accompanying a height variation of the illumination spot, and the focus actuator is controlled based on the deviation amount of the focusing position, and scattered light intensities at the same coordinates of the sample are added.

Abstract: A defect inspection apparatus includes an illumination unit configured to irradiate a surface of a sample with a linear illumination spot; a condensing detection unit configured to condense reflected light of the illumination spot and to control a polarization state of the incident light to form an optical image; and a sensor unit configured to output the optical image and including an array-shaped light receiving portion and an antireflection film at a position conjugate with the illumination spot, in which the condensing detection unit includes a polarization control unit configured to increase light incident efficiency to the sensor unit. The normal line of the light receiving surface of the sensor unit is inclined from the optical axis of the condensing detection unit by 10 degrees or more and less than 80 degrees. The light condensing detection unit increases the optical magnification in the lateral direction of the illumination spot.

Abstract: An object of the invention is to provide a defect inspection device capable of correcting image forming position deviation due to displacement of a sample surface in a Z direction while enabling image forming detection from a direction not orthogonal to a longitudinal direction of illumination. The detect inspection device according to the invention is configured to determine on which lens in a lens array scattered light is incident according to a detection elevation angle of the scattered light from a sample, and an image position of the scattered light having a small elevation angle is corrected more than an image position of the scattered light having a large elevation angle (see FIG. 19).

Abstract: An inspection device includes an illumination optical system that irradiates a sample to be inspected with light having a predetermined wavelength, a detection optical system that includes a photoelectric conversion unit, collects reflected light or scattered light from the sample irradiated with the light, and guides the collected reflected or scattered light to the photoelectric conversion unit, and a data processing unit that extracts positional information of a foreign substance or a defect on the sample by processing an output signal from the photoelectric conversion unit that detects the reflected light or scattered light. The light collection optical system includes a polarized light transmission control unit that changes transmission characteristics according to polarization characteristics of the collected reflected light or scattered light.