Implementation of focusing and redirecting light through highly scattering media

B. Coyotl-Ocelotl; R. Porras-Aguilar; R. Ramos-Garcia; J. C. Ramirez-San-Juan

doi:10.1117/12.2202820

24 August 2015 Implementation of focusing and redirecting light through highly scattering media

B. Coyotl-Ocelotl, R. Porras-Aguilar, R. Ramos-Garcia, J. C. Ramirez-San-Juan

Author Affiliations +

Proceedings Volume 9660, SPECKLE 2015: VI International Conference on Speckle Metrology; 96601X (2015) https://doi.org/10.1117/12.2202820
Event: SPECKLE 2015: VI International Conference on Speckle Metrology, 2015, Guanajuato, Mexico

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.

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B. Coyotl-Ocelotl, R. Porras-Aguilar, R. Ramos-Garcia, and J. C. Ramirez-San-Juan "Implementation of focusing and redirecting light through highly scattering media", Proc. SPIE 9660, SPECKLE 2015: VI International Conference on Speckle Metrology, 96601X (24 August 2015); https://doi.org/10.1117/12.2202820

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