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Proceedings Paper

Non-linear grating-based angular filter for ballistic transillumination
Author(s): Paulino Vacas-Jacques; Vladimir Ryabukho; Marija Strojnik; Valery Tuchin; Gonzalo Paez
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Paper Abstract

We describe the implementation of a non-linear grating-based angular filter for the assessment of turbid media with ballistic photons. A monochromatic source incident on a ruled grating, positioned at grazing diffraction, followed by a narrow slit conform the proposed system. We validate the angular amplification experimentally, with values ranging on the order of 10-20X. In addition, similar values of transversal beam size reduction, provide an efficient ~100X filtering scheme. We address the plausible application of the angular filter to perform ballistic transillumination of turbid media, such as biological tissue. Non-linear angular amplification and beam width reduction are employed to separate ballistic photons from forward-scattered ones. Preliminary experimental results of the technique are encouraging, as compared to those of traditional transillumination.

Paper Details

Date Published: 9 July 2009
PDF: 10 pages
Proc. SPIE 7371, Novel Optical Instrumentation for Biomedical Applications IV, 73710J (9 July 2009); doi: 10.1117/12.831727
Show Author Affiliations
Paulino Vacas-Jacques, Ctr. de Investigaciones en Óptica (Mexico)
Vladimir Ryabukho, Saratov State Univ. (Russian Federation)
Marija Strojnik, Ctr. de Investigaciones en Óptica (Mexico)
Valery Tuchin, Saratov State Univ. (Russian Federation)
Gonzalo Paez, Ctr. de Investigaciones en Óptica (Mexico)

Published in SPIE Proceedings Vol. 7371:
Novel Optical Instrumentation for Biomedical Applications IV
Christian D. Depeursinge; I. Alex Vitkin, Editor(s)

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