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Optical proximity correction method utilizing ruled ladder bars as sub-resolution assist features

  • US 6,881,523 B2
  • Filed: 03/13/2002
  • Issued: 04/19/2005
  • Est. Priority Date: 03/14/2001
  • Status: Active Grant
First Claim
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1. A photolithography mask for optically transferring a pattern formed in said mask onto a substrate, said mask comprising:

  • a plurality of resolvable features to be printed on said substrate, each of said plurality of resolvable features having a longitudinal axis extending in a first direction; and

    a pair of non-resolvable optical proximity correction features disposed between two of said plurality of resolvable features, said pair of non-resolvable optical proximity correction features having a longitudinal axis extending in a second direction, wherein said first direction of said longitudinal axis of said plurality of resolvable features is orthogonal to said second direction of said longitudinal axis of said pair of non-resolvable optical proximity correction features, and wherein said pair of non-resolvable optical proximity correction features have a length dimension which is substantially equal to the width of a space separating said two of said plurality of resolvable features.

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