Scatterometry multi-structure shape definition with...

Data processing: structural design – modeling – simulation – and em – Simulating electronic device or electrical system

Reexamination Certificate

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Reexamination Certificate

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07747424

ABSTRACT:
A modeling approach is disclosed which addresses samples with different regions where the structures exhibit different periodicities. In this approach, a first partial model is generated which defines the shape, material properties and periodicity of the first region. In addition, a second partial model is generated defining the shape, material properties and periodicity of the second region. These two partial models are then merged into a combined model. When optimizing the combined model, the shape and material properties of the first and second models are independently adjusted. The optical responses of the model with differing shapes and material properties are-calculated and compared to a physical sample. This process is iteratively carried out to derive a final combined model that corresponds to a physical sample.

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