20 July 2015 Spatial frequencies selection for speckle grain reduction through semi-transparent media
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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.
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Diego Di Battista, Diego Di Battista, Daniele Ancora, Daniele Ancora, Stella Avtzi, Stella Avtzi, Marco Leonetti, Marco Leonetti, Giannis Zacharakis, Giannis Zacharakis, } "Spatial frequencies selection for speckle grain reduction through semi-transparent media", Proc. SPIE 9541, Optical Coherence Imaging Techniques and Imaging in Scattering Media, 95410E (20 July 2015); doi: 10.1117/12.2183753; https://doi.org/10.1117/12.2183753

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