2 Apr 2026
Job Information
- Organisation/Company
CNRS- Department
Institut Fresnel- Research Field
Engineering
Physics
Technology- Researcher Profile
First Stage Researcher (R1)- Application Deadline
22 Apr 2026 - 23:59 (UTC)- Country
France- Type of Contract
Temporary- Job Status
Full-time- Hours Per Week
35- Offer Starting Date
1 Sep 2026- Is the job funded through the EU Research Framework Programme?
Horizon 2020- Is the Job related to staff position within a Research Infrastructure?
No
Offer Description
The Fresnel Institute has developed a wide-field coherent anti-Stokes Raman scattering (CARS) imaging technique using speckle illumination [1]. This method employs low-repetition-rate lasers (∼100 kHz) with high pulse energy (microjoule range) to generate random speckle patterns for both the pump and Stokes beams. By rapidly varying the speckle illumination of the pump beam, the CARS signal generation can be rendered incoherent, thereby achieving a depth of field comparable to that of microscopes using incoherent light. This approach enables video-rate CARS chemical imaging over fields of view exceeding 200 µm. The technique can also be extended to achieve optical sectioning at the micron scale and super-resolution imaging (twice the diffraction limit). This is accomplished by acquiring sequential speckle illumination images and processing them using Random Illumination Microscopy (RIM).
This wide-field CARS chemical imaging technique has been successfully applied to biological samples using near-infrared lasers in the 700–900 nm range.
The goal of this research is to extend wide-field CARS chemical imaging techniques to the infrared domain, specifically for pump and Stokes beams with wavelengths above 1.4 µm. In this spectral range, it becomes possible to image semiconductor components.
Semiconductor materials exhibit vibrational modes that depend on their crystal lattice and crystallographic symmetry. Imaging these modes over large fields should reveal mechanical stresses, doping effects, and local temperature variations.
Thus, this project aims to develop a wide-field coherent Raman microscope capable of imaging centimeter-scale areas of semiconductor materials.
[1] Fantuzzi, E.M., Heuke, S., Labouesse, S. et al. Wide-field coherent anti-Stokes Raman scattering microscopy using random illuminations. Nat. Photon. 17, 1097–1104 (2023). https://doi.org/10.1038/s41566-023-01294-x
The project is part of an H2020/ERC research program
Where to apply
- Website
- https://emploi.cnrs.fr/Offres/CDD/UMR7249-HERRIG-027/Default.aspx
Requirements
- Research Field
- Engineering
- Education Level
- PhD or equivalent
- Research Field
- Physics
- Education Level
- PhD or equivalent
- Research Field
- Technology
- Education Level
- PhD or equivalent
- Languages
- FRENCH
- Level
- Basic
- Research Field
- Engineering
- Years of Research Experience
- None
- Research Field
- Physics
- Years of Research Experience
- None
- Research Field
- Technology
- Years of Research Experience
- None
Additional Information
Eligibility criteria
The research program will focus on three main objectives:
1. Experimental Development: Design and implement a wide-field coherent Raman imaging system.
2. Validation: Demonstrate the technique's effectiveness by imaging the 520 cm⁻¹ silicon Raman line.
3. Exploration: Investigate the vibrational modes of other semiconductor materials (e.g., h-BN, MoS₂, GaN).
Expertise in:
- Experimental optics
- Data processing
are expected
- Website for additional job details
https://emploi.cnrs.fr/Offres/CDD/UMR7249-HERRIG-027/Default.aspx
Work Location(s)
- Number of offers available
- 1
- Company/Institute
- Institut Fresnel
- Country
- France
- City
- MARSEILLE 13
- Geofield
Contact
- City
MARSEILLE 13- Website
http://www.fresnel.fr
STATUS: EXPIRED
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