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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 21 — Oct. 13, 2008
  • pp: 17107–17118

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

M. Paturzo, F. Merola, S. Grilli, S. De Nicola, A. Finizio, and P. Ferraro  »View Author Affiliations

Optics Express, Vol. 16, Issue 21, pp. 17107-17118 (2008)

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

© 2008 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(070.6020) Fourier optics and signal processing : Continuous optical signal processing
(090.0090) Holography : Holography
(090.1760) Holography : Computer holography
(100.6640) Image processing : Superresolution
(110.0180) Imaging systems : Microscopy

ToC Category:

Original Manuscript: May 20, 2008
Revised Manuscript: August 9, 2008
Manuscript Accepted: August 20, 2008
Published: October 10, 2008

Virtual Issues
Vol. 3, Iss. 12 Virtual Journal for Biomedical Optics

M. Paturzo, F. Merola, S. Grilli, S. De Nicola, A. Finizio, and P. Ferraro, "Super-resolution in digital holography by a two-dimensional dynamic phase grating," Opt. Express 16, 17107-17118 (2008)

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