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Proceedings Paper

Co-integration of a smart CMOS image sensor and a spatial light modulator for real-time optical phase modulation
Author(s): Timothé Laforest; Arnaud Verdant; Antoine Dupret; Sylvain Gigan; François Ramaz; Gilles Tessier
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Paper Abstract

We present a CMOS light detector-actuator array, in which every pixel combines a spatial light modulator and a photodiode. It will be used in medical imaging based on acousto-optical coherence tomography with a digital holographic detection scheme. Our architecture is able to measure an interference pattern between a scattered beam transmitted through a scattering media and a reference beam. The array of 16 μm pixels pitch has a frame rate of several kfps, which makes this sensor compliant with the correlation time of light in biological tissues. In-pixel analog processing of the interference pattern allows controlling the polarization of a stacked light modulator and thus, to control the phase of the reflected beam. This reflected beam can then be focused on a region of interest, i.e. for therapy. The stacking of a photosensitive element with a spatial light modulator on the same chip brings a significant robustness over the state of the art such as perfect optical matching and reduced delay in controlling light.

Paper Details

Date Published: 4 March 2014
PDF: 6 pages
Proc. SPIE 9022, Image Sensors and Imaging Systems 2014, 90220N (4 March 2014); doi: 10.1117/12.2039867
Show Author Affiliations
Timothé Laforest, CEA-LETI-MINATEC (France)
Arnaud Verdant, CEA-LETI-MINATEC (France)
Antoine Dupret, CEA-LETI-MINATEC (France)
Sylvain Gigan, ESPCI ParisTech, Institut Langevin, CNRS (France)
François Ramaz, ESPCI ParisTech, Institut Langevin, CNRS (France)
Gilles Tessier, Neurophysiology and New Microscopies Lab., CNRS, Univ. Paris Descartes (France)

Published in SPIE Proceedings Vol. 9022:
Image Sensors and Imaging Systems 2014
Ralf Widenhorn; Antoine Dupret, Editor(s)

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