Patent Document ID: 9939250
Application ID: 15036471
Patent Status: 1

Claim One:
1. A method of calculating electromagnetic scattering properties of a structure, the method comprising: illuminating, using an illumination system, the structure with radiation; measuring, using a detection system, radiation scattered from the structure to obtain measurement data; obtaining a prior estimate of the electromagnetic scattering properties of the structure; deriving a regularization coefficient based on the measurement data; obtaining estimates of the electromagnetic scattering properties by using trial values of the electromagnetic scattering properties and the regularization coefficient; determining whether a termination condition is met using a merit function, parameters of the merit function including the regularization coefficient the prior estimate, and the estimates of the electromagnetic scattering properties; and if the termination condition is not met, iteratively repeating the obtaining a prior estimate and the deriving a regularization coefficient until the termination condition is satisfied; whereby the trial values provided by a final iteration represent the calculated electromagnetic scattering properties.