Salgado Remacha, Francisco JavierSánchez Brea, Luis MiguelBernabeu Martínez, Eusebio2023-06-202023-06-2020111990-257310.2971/jeos.2011.11055https://hdl.handle.net/20.500.14352/44283© The Authors. This work has been partially supported by project DPI2011-27851 and project INNPACTO ”FORE”, IPT-020000-2010-9 of the Ministerio de Ciencia e Innovación of Spain.We analyze the effect of the fill factor of binary diffraction gratings on the near field propagation. We show that the location of the best-visibility planes changes with the configuration parameters of the grating, that is, the amplitude and phase modulation and the fill factor. Moreover, different intensity patterns and contrast shapes can be obtained when different configurations are used. Analytical expressions describing the contrast of the diffracted field are obtained, that agree with numerical simulations.engjournal articlehttp://dx.doi.org/10.2971/jeos.2011.11055http://www.jeos.orgopen access535Diffracting GratingsFill FactorÓptica (Física)2209.19 Óptica Física