Lab / Structure : UB CELIA / ICMCB

« Laser structuring is a well-established method for producing photonic components by locally modifying the refractive index of an optical material [1]. Waveguides, resonators, Bragg gratings and more complex structures have been produced using this process for many years. Such structures are essential building blocks for the implementation of integrated photonic architectures such as: (i) integrated microlasers; (ii) directional couplers between two grating guides for multiplexing applications; (iii) arrays of numerous guides coupled in cascade to produce topological insulators; (iv) interferometric structures used as strain, temperature or index sensors. Such integrated optics architectures can also be used in the quantum regime, with the manipulation of single or entangled photons. »

Application deadline : 30/06/2023

Keywords : Thrust 3, Team Optique et Lasers Femtosecondes, CELIA, Team Chimie et Photonique des Matériaux Oxydes et Fluorés, ICMCB

Lab / Structure : UB LOMA

« Light can carry both spin and orbital angular momentum, which related to the polarization state of light and its spatial degrees of freedom, respectively. Inhomogeneous and anisotropic media can couple these degrees of freedom, hence leading to spin-orbit interaction for the light field.
When a material system is both inhomogeneous and anisotropic, there is room for versatile beam shaping capabilities, including the control of frequency dependence of the spatial properties of light. Recently, we have developed a few options to control the spatial modal content of light using either dielectric metasurfaces or nanostructured glasses. Also, noting that shaping light usually implies the modification of energy flux and of both linear and angular momentum fluxes, the question of whether the mechanical consequences of the shaping process can be used a tool to assess the structural wave properties has been addressed. Now we aim at combining these ap- proaches with frequency dependence toward spatiotemporal shaping of polychromatic light fields and its mechanical counterpart from the material point of view. »

Application deadline : 30/06/2023

Keywords : Thrust 1, Team Singular, LOMA

Lab / Structure : UB CELIA

« The PhD student will integrate a CELIA team leading international (EUROfusion, NLUF, LBS) and national (ANR) projects on laser-driven plasma studies under strong B-fields in relation to thermonuclear fusion and laboratory-astrophysics.

He/she will contribute to :

• Increase the understanding of laser-induced hot-electron generation and electron energy transport in broad ranges of plasma collisionality and magnetization > robust experimental references for model benchmarking or new theoretical input into simulation codes.
• Develop and explore platforms for magnetized plasma experiments in presence of seed B-fields (either laser-driven or from pulsed-discharges in coils) > energy transport, diffusion of magnetic flux, magnetized hydrodynamic instabilities.
• Develop novel high-resolution X-ray instrumentation and data analysis dedicated to the characterization of magnetized HED plasma > high-resolution X-ray spectrometry, X-ray Talbot-Lau interferometry, X-ray phase contrast imaging, proton radiography »

Application deadline : 30/06/2023

Keywords : Thrust 1, Team PETRUX, CELIA