Patent ID: 7710579
Filing Date: 2010-05-04
Classification: G01B

Abstract:
1. A measuring method of measuring a depth of a trench pattern formed on a substrate, comprising the steps of: a) applying illumination light to a substrate having a measurement area where a trench pattern extending in a predetermined direction is formed; b) spectrally dispersing reflected light of said illumination light from said substrate by a diffraction grating which is arranged so that an angle formed between a direction on said substrate which corresponds to a grating direction of said diffraction grating and said predetermined direction becomes equal to or greater than 40 degrees and equal to or smaller than 50 degrees; c) receiving light dispersed in said step b) on a detector to acquire a measured spectral reflectance of said measurement area; and d) comparing said measured spectral reflectance with calculated spectral reflectances which are obtained by a computation where at least a depth of said trench pattern and an area ratio of a bottom face of said trench pattern are used as parameters, to determine values of said parameters.