Recovering image resolution in reconstructing digital off-axis holograms by Fresnel-transform method

Year: 2004

Authors: Ferraro P., De Nicola S., Finizio A., Pierattini G., Coppola G.

Autors Affiliation: Istituto Nazionale di Ottica Applicata, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy;
Istituto di Cibernetica “E. Caianiello” del CNR, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy;
Istituto per la Microelettronica e Microsistemi del CNR, Via P. Castellino 111, 80134 Napoli, Italy

Abstract: The resolution of amplitude and phase reconstruction of images from digital holograms by the Fresnel transformation method is limited by the pixel width in the reconstructed image plane. The reconstruction pixel depends on distance, wavelength, and number of pixels in the hologram. The spatial frequencies, in the reconstructed image, are band limited by the size of the reconstruction pixel. Undersampling can occur, in the image plane, in the reconstructed amplitude and/or wrapped phase maps. Recovery of reconstructed undersampled spatial frequencies, is possible by the fictitious enlargement of the digital hologram. Correct profile reconstruction of a silicon microelectromechanical structure is demonstrated, applying the proposed method. (C) 2004 American Institute of Physics.

Journal/Review: APPLIED PHYSICS LETTERS

Volume: 85 (14)      Pages from: 2709  to: 2711

KeyWords: Microscopy
DOI: 10.1063/1.1791735

ImpactFactor: 4.308
Citations: 51
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