Co-integration of a smart CMOS image sensor and a spatial light modulator for real-time optical phase modulation

Timothé Laforest; Arnaud Verdant; Antoine Dupret; Sylvain Gigan; François Ramaz; Gilles Tessier

doi:10.1117/12.2039867

4 March 2014 Co-integration of a smart CMOS image sensor and a spatial light modulator for real-time optical phase modulation

Timothé Laforest, Arnaud Verdant, Antoine Dupret, Sylvain Gigan, François Ramaz, Gilles Tessier

Author Affiliations +

Proceedings Volume 9022, Image Sensors and Imaging Systems 2014; 90220N (2014) https://doi.org/10.1117/12.2039867
Event: IS&T/SPIE Electronic Imaging, 2014, San Francisco, California, United States

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.

Citation Download Citation

Timothé Laforest, Arnaud Verdant, Antoine Dupret, Sylvain Gigan, François Ramaz, and Gilles Tessier "Co-integration of a smart CMOS image sensor and a spatial light modulator for real-time optical phase modulation", Proc. SPIE 9022, Image Sensors and Imaging Systems 2014, 90220N (4 March 2014); https://doi.org/10.1117/12.2039867

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