title: Through-focus scanning optical microscopy (TSOM) considering optical aberrations: practical implementation.
abstract: Through-focus scanning optical microscopy (TSOM) method based on use of a library, which is composed of simulated defocused images of nanosized silicon lines on the top of a monocrystalline silicon substrate, is demonstrated. The images are simulated using Finite-Differences in Time-Domain (FDTD) method taking into account optical aberrations of the experimental setup, which are measured experimentally. Consideration of the optical aberrations allows us to reduce the discrepancy between experimental and simulated defocused images of the samples under study to the value of ≈2%in contrast to ≈10% when the aberrations are not taken into account. It results in ≈5% recognition accuracy for critical dimension (CD) values in the range 40-150 nm.
authors.forename: Maxim
authors.initials: M
authors.lastname: Ryabko
authors.forename: Alexey
authors.initials: A
authors.lastname: Shchekin
authors.forename: Sergey
authors.initials: S
authors.lastname: Koptyaev
authors.forename: Alexey
authors.initials: A
authors.lastname: Lantsov
authors.forename: Anton
authors.initials: A
authors.lastname: Medvedev
authors.forename: Alexander
authors.initials: A
authors.lastname: Shcherbakov
authors.forename: Sang Yoon
authors.initials: SY
authors.lastname: Oh