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

Diego Di Battista; Daniele Ancora; Stella Avtzi; Marco Leonetti; Giannis Zacharakis

doi:10.1117/12.2183753

20 July 2015 Spatial frequencies selection for speckle grain reduction through semi-transparent media

Diego Di Battista, Daniele Ancora, Stella Avtzi, Marco Leonetti, Giannis Zacharakis

Proceedings Volume 9541, Optical Coherence Imaging Techniques and Imaging in Scattering Media; 95410E (2015) https://doi.org/10.1117/12.2183753
Event: European Conferences on Biomedical Optics, 2015, Munich, Germany

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.

Citation Download Citation

Diego Di Battista, Daniele Ancora, Stella Avtzi, Marco Leonetti, and 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); https://doi.org/10.1117/12.2183753

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