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.
© 2012 Optical Society of America
Fourier Optics and Signal Processing
Original Manuscript: July 24, 2012
Manuscript Accepted: August 27, 2012
Published: September 28, 2012
Tomoyoshi Shimobaba, Kyoji Matsushima, Takashi Kakue, Nobuyuki Masuda, and Tomoyoshi Ito, "Scaled angular spectrum method," Opt. Lett. 37, 4128-4130 (2012)