Open AccessA novel phase retrieval technique based on propagation diversity via a dielectric slab
Author(s) -
Francesco Soldovieri,
Giovanni Leone,
Rocco Pierri
Publication year - 2008
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.16.007418
Subject(s) - phase retrieval , optics , aperture (computer memory) , plane wave , plane (geometry) , dielectric , field (mathematics) , near and far field , phase (matter) , intensity (physics) , inverse problem , slab , physics , acoustics , mathematics , geometry , fourier transform , optoelectronics , mathematical analysis , quantum mechanics , geophysics , pure mathematics
This paper deals with a novel technique to determine the far field of an aperture starting from the knowledge of two near-field intensity data sets collected over the same measurement plane. The diversity between the two intensity data sets is achieved by ensuring different conditions of the near field propagation between the aperture and the measurement plane. In particular, one measurement is performed under free-space propagation condition while the second one is performed by exploiting a dielectric slab, with known properties, filling partly the space between the aperture and the measurement plane. A phase retrieval technique, that faces a non linear inverse problem, is solved by assuming as unknown the plane wave spectrum of the aperture field. The feasibility of the novel approach is presented also in comparison with the usual near field phase retrieval technique exploiting measurements of the near field intensity over two scanning planes.