Super-resolution in digital holography by a two-dimensional dynamic phase grating

• DOI: 10.1364/oe.16.017107
• Publication Date: 2008-10-10T18:52:46Z
• Authors: M. Paturzo; F. Merola; S. Grilli; S. De Nicola; A. Finizio; P. Ferraro
• Keywords: Digital Holographic Microscopy; Digital holography; Spatial light modulator; Diffraction efficiency; Numerical aperture; Spatial frequency

An approach that uses an electro-optically tunable two dimensional phase grating to enhance the resolution in digital holographic microscopy is proposed. We show that, by means of a flexible hexagonal grating, it possible increase numerical aperture imaging system, thus improving spatial images dimensions. The augment optical system obtained recording spatially multiplexed holograms. tuneability allows one adjust intensity among holograms maximizing diffraction efficiency. Furthermore we demonstrate flexibility reconstruction use selectively orders carrying useful information for increasing resolution. proposed can improve capabilities holography three-dimensional and microscopy.