Method for correlating the line width roughness of gratings...

Details Method for correlating the line width roughness of gratings... Method for correlating the line width roughness of gratings...

2007-04-04

2008-09-30

Nguyen, Sang (Department: 2886)

Optics: measuring and testing

Dimension

Width or diameter

C356S600000, C356S605000, C382S108000, C702S155000

Reexamination Certificate

active

07430052

ABSTRACT:
A method for correlating line width roughness of gratings first performs a step (a) generating a characteristic curve of a predetermined grating having a known line width, and a step (b) performing a comparing process to select a matching spectrum from a plurality of simulated diffraction spectrum of known line width, and setting the known line width of the matching spectrum as the virtual line width of the predetermined grating. Subsequently, the method performs a step (c) changing a measuring angle and repeating the steps (a) and (b) to generate a virtual line width curve, and calculating the deviation of the virtual line width curve. The method then performs a step (d) changing the line width roughness of the predetermined grating and repeating the steps (a), (b) and (c), and a step (e) correlating the line width roughness and the deviation of the virtual line width curve to generate a correlating curve.

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