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Claude Cohen Tannoudji

Prix Nobel en 1997 pour le ralentissement et le piégeage des atomes par la lumière laser.

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Accueil du site > Archives > Post-Doctoral position : Optical Trapping of Nanoparticles in Gas Phase

Post-Doctoral position : Optical Trapping of Nanoparticles in Gas Phase

Description of LAPHIA – Cluster of Excellence (IdEx Bordeaux program)

The Cluster of Excellence LAPHIA (IdEx) brings together teams belonging to 11 research laboratories in Bordeaux. The LAPHIA project is expected to have a long-term structuring role in both the academic and economic spheres through the production and transfer of cutting-edge knowledge in laser and photonics.

The LAPHIA project aims to create a consortium around sciences of light – optics, photonics, lasers. The Bordeaux pole in optics is already recognized as leading in several fields : high energy lasers, hot plasmas laser-matter interaction physics, material science. The industrial dynamics is really impressive in the Bordeaux and Aquitaine areas, with a rapidly growing cluster of research centers and industrial companies dealing with optical and laser technologies.

In this favorable context, the LAPHIA project aims to federate the whole relevant academic community around coherent and innovative projects in lasers and photonics, while strengthening the links with CEA. The unique Centre of excellence structure will promote Bordeaux to among the most visible centers in Lasers and Photonics at European and international levels, resulting in a strong attractivity for students, researchers and private companies.

For more information : laphia.labex-u-bordeaux.fr/en/

Duration : 12 months

Job statuts : posdoctoral position

  • LOCATION : NOG/LOMA, University of Bordeaux, Talence.
  • DATE : start : as soon as possible
  • Salary : approx.. 2200€ (depending on experience)


The proposal concerns optically levitated nanoparticles embedded in air. We plan to study at various pressures the physical and optical properties of these nanoparticles, as for example, the heat transfer between the particle and the environment. In addition, according to the time scale and the gas pressure at which we observe the laser-trapped particle, it is possible to study the transition between the Brownian motion and the ballistic regime and test theorems from statistical physics. We envisage trapping various nanomaterials like silica, semiconducting and diamond. The fluorescent trapped nanoparticles will be used for realizing new applications in the area of the nanoscopy. On the whole, our project aims at freezing the motion of the nanoparticle in order to bring this opto-mechanical system to the ability to test theorems of nonequilibrium statistical physics, to realize hybrid quantum objects between the photon and the phonon or, to measure ultra-weak forces of the order of 10-20 N.
Although, a theoretical part is conceivable, the postdoctoral candidate will mainly participate to the experimental development of the project.

Calculated position of a 100-nm nanoparticle trapped at ambiant pressure in agreement with experimental results. In this case the motion is Brownian, while at approximately 1 mbar the regime becomes ballistic and the particle motion is therefore described by an harmonic oscillator.

Profile of applicant

It is asked to the candidate to have experimental skills in applied physics, optics or related disciplines. Ideally, the candidate will have experiences in optical tweezers, optical microscopy or atomic physics.


Interested candidates are invited to apply by email with a CV and at least one letter of recommendation to Yann Louyer : yann.louyer(at)u-bordeaux.fr.

Post-scriptum :

LAPHIA (Laser & Photonics in Aquitaine)
Institut d’Optique d’Aquitaine
Rue François Mitterrand
33 400 Talence Cedex
T 33 (0)5 57 01 71 11
Mail : Info.laphia u-bordeaux.fr