Patent ID: 7995199
Filing Date: 2011-08-09
Classification: G03F

Abstract:
1. A method of inspecting a sub-resolution assist features (SRAF) on a reticle, comprising: (a) providing a test SRAF on a reticle; (b) determining a test flux measurement for a test boundary area that encompasses a width of the test SRAF and a length portion of the test SRAF and determining at least one reference flux measurement for one or more reference boundary areas of one or more reference SRAF's, wherein each reference boundary area encompasses a width of each reference SRAF and a length portion of such each reference SRAF; (c) comparing the test flux measurement with the one or more reference flux measurement to determine whether the test SRAF is undersized or oversized; and (d) if the test SRAF is determined to be oversized, determining whether the test SRAF is defective based on the comparison using a first threshold.