Method of verifying corrected photomask-pattern results and device for the same

A method of verifying photomask-pattern-correction results, comprising:

• cutting away photomask patterns of a region to be subjected to correction;
• forming photoresist models used for execution of an optical-proximity effect-correction operation;
• executing said optical-proximity-effect-correction operation of said photomask patterns with respect to said photoresist models;
• executing an exposure simulation for simulating photoresist patterns formed on a photoresist film to which said photomask patterns are transferred after said optical-proximity-effect-correction operation;
• designating lithographic parameters required for executions of said cutting away said photomask patterns of said region, said forming of said photoresist models, said optical-proximity-effect-correction operation, and said exposure simulation;
• measuring sizes of said photoresist patterns subjected to said exposure simulation;
• plotting exposure defocus trees and margin curves to show a relationship between exposure doses and defocus distances so that said photoresist patterns to which said photomask patterns are transferred after said optical-proximity-effect-correction operation are in a predetermined size;
• detecting deviations of said photoresist patterns from originally designed photomask patterns with respect to said photomask patterns after said optical-proximity-effect-correction operation;
• and
• designating lithographic parameters required for said measuring of said sizes of said photoresist patterns, said plotting of said exposure defocus trees and margin curves, and said detecting of said deviations,
• wherein said detecting of said deviations is executed before said executing of said exposure simulation, said measuring of said sizes of said photoresist patterns and said plotting of said exposure defocus trees and margin curves.