Patent ID: 7366620
Filing Date: 2008-04-29
Classification: G01B,G01N,G03F,H01J

Abstract:
1. An evaluation method of fine pattern feature, comprising the steps of: scanning a device under test with an electron beam irradiating thereon, detecting secondary electrons emitted from the device under test or reflected electrons, and converting a two-dimensional distribution of the detected signal intensity into a gray-scaled image; measuring positions of points constituting a boundary of an evaluation target pattern within the image at constant intervals along a reference straight line to generate roughness data of pattern edges; Fourier transforming the roughness data; adding all the absolute values of Fourier coefficients squared for a frequency in the specific frequency region to compute a total value according to inputs for specifying a specific frequency region or a specific frequency region being set up in advance; and outputting at least one or more values selected from among the total value, a square root of the total value, two times the square root of the total value, three times the square root of the total value, and six times the square root of the total value as an index representing characteristics of the evaluation target pattern feature, wherein an upper limit or lower limit of the specific frequency region that is specified by inputs or set up in advance is an inverse of a pattern length on an article that is made.