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Proceedings Paper

Spatial frequencies selection for speckle grain reduction through semi-transparent media
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Paper Abstract

By compensating the random phase delay acquired while a light beam crosses a scattering curtain, it is possible to address the light at selected target position beyond the obstacle. An opaque lens can produce foci with a resolution higher than conventional optics if a strongly scattering medium is exploited. In practice, subwavelength resolution is obtained only for weakly transmitting samples. Herein we present a method which allows obtaining tiny bright optical spots even in presence of a minimum amount of scattering (semi-transparent media) in the beam path. Using a High-Pass spatial filter we block the pseudo-ballistic components of the transmitted beam, we are able to gather light on a spot with a diameter which is one third of the typical speckle grain in absence of the filter.

Paper Details

Date Published: 20 July 2015
PDF: 8 pages
Proc. SPIE 9541, Optical Coherence Imaging Techniques and Imaging in Scattering Media, 95410E (20 July 2015); doi: 10.1117/12.2183753
Show Author Affiliations
Diego Di Battista, Institute of Electronic Structure and Laser (Greece)
Daniele Ancora, Institute of Electronic Structure and Laser (Greece)
Stella Avtzi, Institute of Electronic Structure and Laser (Greece)
Marco Leonetti, Istituto Italiano di Tecnologia (Italy)
Giannis Zacharakis, Institute of Electronic Structure and Laser (Greece)


Published in SPIE Proceedings Vol. 9541:
Optical Coherence Imaging Techniques and Imaging in Scattering Media
Brett E. Bouma; Maciej Wojtkowski, Editor(s)

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