Clear coherent imaging in turbid microfluidics by multiple holographic acquisitions.
Recently it has been demonstrated that digital holography is a powerful means allowing imaging of both amplitude and phase objects in turbid flowing media. However, in quasi-static turbid microfluidics, multiple scattering contributions through the colloids superimpose coherently to the recording device, resulting in speckle noise and hindering a clear vision of the objects. In this Letter we exploit the Brownian motion of the colloidal particles to get multiple uncorrelated holograms, and we combine them to reduce the speckle contrast. In this way we get a multi-look gain without losing image resolution.
CNR—National Institute of Optics, Via Campi Flegrei, 34, Pozzuoli (NA) I-80078, Italy. vittorio.bianco@ino.it
Vittorio
V
Bianco
Melania
M
Paturzo
Andrea
A
Finizio
Donatella
D
Balduzzi
Roberto
R
Puglisi
Andrea
A
Galli
Pietro
P
Ferraro