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Proceedings Paper

Implementation of focusing and redirecting light through highly scattering media
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Paper Abstract

Optical imaging through highly scattering media such as biological tissue is limited by light scattering. Recently, it has been shown that wavefront shaping is a powerful tool to overcome this problem. In this work, wavefront shaping using spatial light modulators is used to compensate static scattering media (piece of translucent tape) to allow focusing of different intensity distributions. Light propagation is engineered into a specific region of interest. For this purpose, a sequential phase shape algorithm was implemented experimentally. This algorithm is used to encode a phase distribution on an incident beam to pre-compensate phase distortions acquired by the beam after propagating through the tape. The sequential algorithm combined with a spatial light modulator is used to synthesize a phase distribution required for redirecting light using wavefront shaping. The scattered light was re-directed at the detector plane, in order to be: i) focused at a single pixel, ii) at squared regions of 3×3 and 5×5 pixeles and iii) a line pattern of 41 pixels of the camera. Furthermore, the region of interest was placed outside the central area of the camera opening the possibility of image formation.

Paper Details

Date Published: 24 August 2015
PDF: 5 pages
Proc. SPIE 9660, SPECKLE 2015: VI International Conference on Speckle Metrology, 96601X (24 August 2015); doi: 10.1117/12.2202820
Show Author Affiliations
B. Coyotl-Ocelotl, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
R. Porras-Aguilar, Instituto Nacional de Astrofisica, Optica y Electronica (Mexico)
Consejo Nacional de Ciencia y Tecnologia (Mexico)
R. Ramos-Garcia, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
J. C. Ramirez-San-Juan, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)

Published in SPIE Proceedings Vol. 9660:
SPECKLE 2015: VI International Conference on Speckle Metrology
Fernando Mendoza Santoyo; Eugenio R. Mendez, Editor(s)

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