Université de Bordeaux
LabEx LAPHIACluster of Excellence
Cluster of excellence

LAPHIA Post-Doc Position : Femtosecond laser induced Waveguide Bragg Gratings in the VISible range (WBG-VIS)

 18/04 - 25/06
Publié le mercredi 18 avril 2018

Duration : 12 months

Job statuts :  Junior post-doctoral position (less than 3 years after PhD)

DATE start : September, 1st 2018
Salary : Net salary around 2300 € /month, for 1 year (depending on experience) 

LOCATION : CELIA laboratory (UMR5107), group « Short Lasers, Applications & Materials »

PhD /Post doc : Femtosecond laser induced Waveguide Bragg Gratings in the VISible range (WBG-VIS)

Refractive index modifications of transparent materials under tightly-focused ultrafast laser beams has brought the possibility to write optical waveguides by simply moving the sample through the beams focus. Such approach allows now for the fast, efficient and versatile fabrication of 3D integrated architectures of waveguides, leading to mature technologies with many applications as optical sensing, photonic integrated circuits for quantum information or astro-photonics... Among the strategic photonic bricks, waveguide Bragg gratings (WBGs) are of prime importance because they can manage the selective reflexion of wavelengths in waveguides. Such behavior results from the periodic perturbation of the effective refractive index of the waveguides, which is fully achievable from ultrafast laser inscription. Laser-based fabrication of WBGs is getting common in the near-IR range, and state-of-the-art results start to access the red spectral range. Indeed, it is highly challenging to achieve efficient WBGs in the visible range because it requires very small periodicities (below 200 nm). Thanks to the optimized ultrafast laser inscription in our non- conventional photosensitive glasses, the WBG-VIS project proposes a breakthrough approach to demonstrate a new type of WBG based on laser-induced spatially-distributed silver clusters, so as to provide high pay-off versatile WBG fabrication process in the visible spectral range, as needed as a key enabling technology to further create integrated distributed feedback waveguide lasers in the visible range with very high spectral purity & brightness.

The candidate will conduct femtosecond laser irradiation experiments of mature and currently under development silver-containing non conventional glasses shaped as bulk or fibered materials, to as to achieve modulated waveguides with embedded spectrally-selective Bragg grating behavior. He will perform the characterization of the transmission of the induced wave guiding structures, as well as other properties with spatially-resolved linear/nonlinear spectroscopies. The modeling of such structures with sub-wavelength features will be addressed. Integrated laser- created cavities with distributed feedback reflective architectures will be investigated, potentially leading to integrated laser devices while considering co-doping with fluorescent rare-earth elements. The candidate will evolve in a highly multi-disciplinary environment involving chemists for material material science and physics for laser irradiation.

Profile of applicant

The candidate will have hands-on experience in experimental physics related to laser physics and optical techniques. Experience in laser-induced modifications of optical materials will be carefully considered. Knowledge of ultrafast optics techniques, beam spatial shaping or super-resolution microscope imaging and instrumentation is also a strong asset. Expertise in characterizing and modeling waveguides, periodic index-constrasted structures (possibly with sub-wavelength features) and/or integrated optical Fabry-Perot & laser resonators will also be appreciated.

Supervisors/Contact

Dr. Yannick Petit (PhD) Assistant Professor University de Bordeaux

ICMCB lab. : group « Chemistry & Photonics of Fluoride & Oxide Materials » 87 Avenue du Dr Albert Schweitzer, 33600 Pessac

CELIA lab. : group « Short Lasers, Applications & Materials » Domaine du Haut Carré - 43, rue Pierre Noailles - 33400 Talence

email: yannick.petit@u-bordeaux.fr tel: 05 4000 2657

Application deadline : June, 25th 2018

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
Info.laphia@u-bordeaux.fr 

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