Patent ID: 11892769
Assignee: CARL ZEISS SMT GMBH
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 18:
19. A method for detecting an object structure, the method comprising:
illuminating at least one portion of an object with illumination light of an at least partly coherent light source from at least one preferred illumination direction;
recording at least one diffraction image of the illuminated portion by spatially resolved detection of the diffraction intensity of the illumination light, diffracted by the illuminated portion, in a detection plane; and
reconstructing at least one portion of the object structure from the at least one recorded diffraction image by way of an iterative method in which, starting from an iteration start value, an iteration diffraction image of a raw object structure is calculated and the latter is compared to the recorded diffraction image in each iteration step;
wherein the iteration start value is obtained with aid of a start measurement of a raw object structure of the object structure to be detected, in which the start measurement is independent of the remaining detection method, and a measurement result of the start measurement is processed to match imaging parameters of the start measurement to imaging parameters of the diffractive imaging recording;
wherein the start measurement is performed without recording a diffraction image; and
wherein the start measurement is generated with at least one of (i) an optical method that is independent of the remaining detection method, (ii) aid of electron microscopy, or (iii) aid of atomic force microscopy.