Non-linear grating-based angular filter for ballistic transillumination

Paulino Vacas-Jacques; Vladimir Ryabukho; Marija Strojnik; Valery Tuchin; Gonzalo Paez

doi:10.1117/12.831727

9 July 2009 Non-linear grating-based angular filter for ballistic transillumination

Paulino Vacas-Jacques, Vladimir Ryabukho, Marija Strojnik, Valery Tuchin, Gonzalo Paez

Proceedings Volume 7371, Novel Optical Instrumentation for Biomedical Applications IV; 73710J (2009) https://doi.org/10.1117/12.831727
Event: European Conferences on Biomedical Optics, 2009, Munich, Germany

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.

Citation Download Citation

Paulino Vacas-Jacques, Vladimir Ryabukho, Marija Strojnik, Valery Tuchin, and Gonzalo Paez "Non-linear grating-based angular filter for ballistic transillumination", Proc. SPIE 7371, Novel Optical Instrumentation for Biomedical Applications IV, 73710J (9 July 2009); https://doi.org/10.1117/12.831727

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