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Nouveaux dispositifs intégrés pour l'analyse et le contrôle de lumière cohérente : conception conjointe de circuits opto-électroniques et systèmes optiques

Abstract : Among the optical medical imaging techniques used in medicine, the main limitation is the low resolution at a penetration depth greater than a few mm. This limitation does not allows competing with the standard imaging techniques such as X rays or RMI based imaging. In that scope, the acousto-optical imaging features several advantages: it allows measuring an optical contrast useful to detect tumors, in conjunction with the spatial resolution of ultrasound. However, the state of the art detecting devices feature a lack of sensitivity, which prevent its transfer to medical practitioners.This leads us to study the intrinsic features of the acousto-optical signal in order to propose two CMOS pixel architectures. The first one, fully analog, is compliant with the correlation time of biological tissue (1 ms typ.) and features an analog processing of the relevant signal. The second one is based on a digital pixel which contains an analog to digital converter, allowing simplifying the optical setup and increasing the robustness of the processing.In addition, related to the recent progress in wavefront control, an opto-electronic device, coupled with the first pixel architecture, has been proposed. It allows performing an optical phase operation (e.g. phase conjugation) in parallel on a pixels array, within the correlation time of biological media. Thus, this monolithic device circumvents the speed limitations of state of the art setup by a physical stacking of a liquid crystals spatial light modulator over a CMOS image sensor.
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https://tel.archives-ouvertes.fr/tel-01660509
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Submitted on : Monday, January 8, 2018 - 11:17:11 AM
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  • HAL Id : tel-01660509, version 2

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Timothé Laforest. Nouveaux dispositifs intégrés pour l'analyse et le contrôle de lumière cohérente : conception conjointe de circuits opto-électroniques et systèmes optiques. Micro et nanotechnologies/Microélectronique. Université de Grenoble, 2014. Français. ⟨NNT : 2014GRENT113⟩. ⟨tel-01660509v2⟩

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