4 March 2014 Co-integration of a smart CMOS image sensor and a spatial light modulator for real-time optical phase modulation
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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.
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Timothé Laforest, Arnaud Verdant, Antoine Dupret, Sylvain Gigan, François Ramaz, 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); doi: 10.1117/12.2039867; https://doi.org/10.1117/12.2039867
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