title: Scaled angular spectrum method.
abstract: The angular spectrum method (ASM) calculates diffraction calculation in a high numerical aperture, unlike Fresnel diffraction. However, this method does not allow us to calculate at different sampling rates on source and destination planes. In this Letter, we propose a scaled ASM that calculates diffraction at different sampling rates on source and destination planes using the nonuniform fast Fourier transform.
authors.affiliation: Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan. shimobaba@faculty.chiba‑u.jp
authors.forename: Tomoyoshi
authors.initials: T
authors.lastname: Shimobaba
authors.forename: Kyoji
authors.initials: K
authors.lastname: Matsushima
authors.forename: Takashi
authors.initials: T
authors.lastname: Kakue
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Masuda
authors.forename: Tomoyoshi
authors.initials: T
authors.lastname: Ito