Array-type miniature interferometer as the core optical microsystem of an optical coherence tomography device for tissue inspection

Nicolas Passilly; Stéphane Perrin; Justine Lullin; Jorge Albero; Sylwester Bargiel; Luc Froehly; Christophe Gorecki; Johann Krauter; Wolfgang Osten; Wei-Shan Wang; Maik Wiemer

doi:10.1117/12.2229477

26 April 2016 Array-type miniature interferometer as the core optical microsystem of an optical coherence tomography device for tissue inspection

Nicolas Passilly, Stéphane Perrin, Justine Lullin, Jorge Albero, Sylwester Bargiel, Luc Froehly, Christophe Gorecki, Johann Krauter, Wolfgang Osten, Wei-Shan Wang, Maik Wiemer

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Proceedings Volume 9890, Optical Micro- and Nanometrology VI; 98900C (2016) https://doi.org/10.1117/12.2229477
Event: SPIE Photonics Europe, 2016, Brussels, Belgium

Abstract

Some of the critical limitations for widespread use in medical applications of optical devices, such as confocal or optical coherence tomography (OCT) systems, are related to their cost and large size. Indeed, although quite efficient systems are available on the market, e.g. in dermatology, they equip only a few hospitals and hence, are far from being used as an early detection tool, for instance in screening of patients for early detection of cancers. In this framework, the VIAMOS project aims at proposing a concept of miniaturized, batch-fabricated and lower-cost, OCT system dedicated to non-invasive skin inspection. In order to image a large skin area, the system is based on a full-field approach. Moreover, since it relies on micro-fabricated devices whose fields of view are limited, 16 small interferometers are arranged in a dense array to perform multi-channel simultaneous imaging. Gaps between each channel are then filled by scanning of the system followed by stitching. This approach allows imaging a large area without the need of large optics. It also avoids the use of very fast and often expensive laser sources, since instead of a single point detector, almost 250 thousands pixels are used simultaneously. The architecture is then based on an array of Mirau interferometers which are interesting for their vertical arrangement compatible with vertical assembly at the wafer-level. Each array is consequently a local part of a stack of seven wafers. This stack includes a glass lens doublet, an out-of-plane actuated micro-mirror for phase shifting, a spacer and a planar beam-splitter. Consequently, different materials, such as silicon and glass, are bonded together and well-aligned thanks to lithographic-based fabrication processes.

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Nicolas Passilly, Stéphane Perrin, Justine Lullin, Jorge Albero, Sylwester Bargiel, Luc Froehly, Christophe Gorecki, Johann Krauter, Wolfgang Osten, Wei-Shan Wang, and Maik Wiemer "Array-type miniature interferometer as the core optical microsystem of an optical coherence tomography device for tissue inspection", Proc. SPIE 9890, Optical Micro- and Nanometrology VI, 98900C (26 April 2016); https://doi.org/10.1117/12.2229477

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KEYWORDS

Mirrors

Optical coherence tomography

Skin

Silicon

Beam splitters

Semiconducting wafers

Microopto electromechanical systems

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