Open AccessComparison of iterative angular spectrum and optimal rotation angle methods in designing beam-fanners
Author(s) -
Seyyed Hossein Kazemi,
Mir Mojtaba Mirsalehi,
Amir Reza Attari
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.014825
Subject(s) - finite difference time domain method , optics , angular spectrum method , rotation (mathematics) , perfectly matched layer , iterative method , aperture (computer memory) , physics , diffraction , spatial frequency , beam (structure) , boundary value problem , finite difference method , mathematics , algorithm , geometry , acoustics , quantum mechanics , thermodynamics
We compare the iterative angular spectrum (IAS) and the optimal rotation angle (ORA) methods in designing two-dimensional finite aperture diffractive optical elements (FADOEs) used as beamfanners. The transfer functions of both methods are compared analytically in the spatial frequency domain. We have designed several structures of 1-to-4 and 1-to-6 beamfanners to investigate the differences in the performance of the beamfanners designed by ORA method for near field operation. Using the three-dimensional finite difference time-domain (3-D FDTD) method with perfect matched layer (PML) absorbing boundary condition (ABC), the diffraction efficiency is calculated for each designed FADOE and the corresponding values are compared.