Focus plane detection criteria in digital holography microscopy by amplitude analysis

We propose and test a focus plane determination method that computes the digital refocus distance of an object investigated by digital holographic microscopy working in transmission. For this purpose we analyze the integrated amplitude modulus as a function of the digital holographic reconstruction...

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Bibliographic Details
Published in:Optics express 2006-06, Vol.14 (13), p.5895-5908
Main Authors: Dubois, Frank, Schockaert, Cédric, Callens, Natcaha, Yourassowsky, Catherine
Format: Article
Language:English
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Summary:We propose and test a focus plane determination method that computes the digital refocus distance of an object investigated by digital holographic microscopy working in transmission. For this purpose we analyze the integrated amplitude modulus as a function of the digital holographic reconstruction distance. It is shown that when the focus distance is reached, the integrated amplitude is minimum for pure amplitude object and maximum for pure phase object. After a theoretical analysis, the method is demonstrated on actual digital holograms for the refocusing of pure amplitude and of pure phase microscopic samples.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.14.005895