Patent Document ID: 20040017574
Application ID: 10206491
Patent Flag: 0

Claim One:
1. A method of selecting a profile model and selecting parameters of the profile model for use in optical metrology of structures in a wafer, the method comprising: a) setting one or more termination criteria; b) setting one or more parameter selection criteria; c) selecting a profile model for use in optical metrology of a structure in a wafer, the profile model having a set of geometric parameters associated with dimensions of the structure; d) selecting a set of optimization parameters for the profile model using one or more input diffraction signals and the one or more parameter selection criteria, wherein the set of optimization parameters is converted from the set of geometric parameters; e) testing the selected profile model and the set of optimization parameters against the one or more termination criteria; and f) performing the steps c, d, and e until the one or more termination criteria are met.