Patent ID: 9140539
Filing Date: 2015-09-22
Classification: G01B,G01R,G06T,H01L

Abstract:
1. An optical system for determining one or more parameters of at least one via-hole in an structure, the optical system comprising: an illumination system for producing at least one light beam and directing it on a sample in a region of the structure containing at least one via-hole; a detection system configured and operable to collect a pattern of light reflected from the illuminated region, the light pattern being indicative of one or more parameters of said via-hole and, a control system connected to the detection system, the control system comprising a memory utility for storing a predetermined theoretical model comprising data representative of a set of parameters describing via-holes reflected pattern, and a data processing and analyzing utility configured and operable to receive and analyze data indicative of the detected light pattern and determine one or more parameters of said via-hole, wherein the illumination system and the detection system comprising at least one of polarizer or spatial filter configured to block a portion of the light pattern reflected from the region surrounding said via-hole.