Missions

The project deals with the development of new ultra-miniaturized imaging tools for applications in for example biological cellular imaging. For about ten years a consortium of three laboratories (PhLAM Laboratory in Lille, Fresnel Institute in Marseille, and INMED in Marseille) carry out this activity.
The technological solution being pursued is that of a fiber-optical endo-microscope assisted by wave front shaping. The optical fiber can be of the multi-core type or multi-mode type, and the wave front shaping can be done by a spatial light modulator of the LCoS type or the DMD type. Conceptually, the method is based on a measurement of the linear transformation of the electrical field effectuated by the fiber, ie its transmission matrix. This knowledge makes possible to perform imaging through the fiber, either by physical inversion of the transmission matrix by the spatial light modulator, or by numerical inversion during data treatment.
This technological solution permits to retain a very thin endoscopic probe (some hundreds of microns or less), identical to the diameter of the fiber itself because no optical elements are attached to the fiber tip.
The project will place itself in the continuity of this existing activity, the objectives are on both the refinement of existing methods and the diversification of existing methods towards new applications.
More exploratory aspects involving computational imaging techniques (compressive sensing and machine learning) applied to fiber endoscopes might also be pursued.

Activités

Activities:
The applicant will perform the following activities linked to specialty optical fibers and their implementation in ultra-miniaturized endo-microscopes:
- Participating in the modelling, design, and conception of specialty optical fibers;
- Participating in the development of strategies for measuring the transmission matrix of optical fibers;
- Participating in the development of strategies for wave front shaping;
- Participating in the experimental setup of proofs of concept and prototypes.

Compétences

We seek an applicant with
- a PhD degree in experimental physics, preferentially in optics, photonics, or similar, and
- preferably with solid competences in data treatment.

Contexte de travail

The applicant will be assigned to the PhLAM Laboratory (Physique des Lasers, Atomes et Molécules, CNRS UMR8523). He/she will work at the IRCICA institute located in the Haute Borne activity park at Villeneuve d'Ascq (close to Lille and the scientific campus of the University of Lille) where a dedicated experiment room has been equipped for the project. IRCICA hosts projects from four partner laboratories working on interdisciplinary themes in information and communication. The contract will be financed by a collaborative ANR project (https://naima.univ-lille.fr/ and https://anr.fr/Project-ANR-20-CE19-0028).

Contraintes et risques

Participation in a 2 day laser safety training course may be required.
The work place is a restricted acces zone (ZRR, "zone à régime réstric