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Thesis Offers

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RF cloaking for desensitisation of close and/or co-located antennas Application in the smallsats context
15-04-2020 - Thesis Offers

Subject description :
The development of projects using small platforms (smallsat or nanosat), whether for constellations (Oneweb, Kinéis, ...) or short duration missions (Entrysat, MarCO, ...), leads space actors to a race for miniaturization, and to the reduction of costs, platform equipment and payload instruments. From a radiofrequency point of view, this is not without consequences on the performance of the various telecommunication links. Indeed, this advanced miniaturisation has two complementary adverse effects :
- A decrease in available on-board power. This reduces margins and therefore requires antennas to be particularly efficient once they are on board the satellite.
- A significant reduction in the available surface area on the sides, which means that the radiating elements take up less space and are closer to each other.
This proximity can lead to a total or partial destruction of antenna performance (mismatch, pattern distortion, degradation of polarization purity, losses ...) that must be studied and compensated for. In this respect, there are in the literature some examples of strategies to solve these problems. It has been shown in [1] that the pattern of a monopole antenna disturbed by the presence of another monopoly placed nearby could be reconstructed by adding a "cloak of invisibility" around the disturbing antenna in order to make it invisible. This promising cloaking technique [1-3] can be used in a spatial context where, on small platforms, antenna co-location is strong.

Thesis advisor : Stefan ENOCH, Institut Fresnel (Aix-Marseille Université, CNRS, Centrale Marseille)
Co-advisor : Nicolas MALLEJAC, CEA DAM Centre du Ripault
CNES supervisor : LAQUERBE Vincent, Service Antennes (DSO/RF/AN)

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New PhD positions for oct. 2020
14-04-2020 - Thesis Offers

The topics involve signal theory, image analysis and reconstruction, modelling in electromagnetism, experimental optics in advanced imaging with applications in biology and astronomy, characterization and detection methods, as well as optical components and nanophotonics.

To apply : please contact the PI in charge of the topics

Roueff


- Apprentissage à l’aide de techniques issues de la théorie de l’information pour la microscopie non conventionnelle - antoine.roueff@fresnel.fr

Alonso-Brasselet


- Nanoscale polarized imaging in 3D - miguel.alonso@fresnel.fr and sophie.brasselet@fresnel.fr

Baffou


- Caractérisation de nanoparticules par imagerie de phase quantitative - guillaume.baffou@fresnel.fr


Bonod


- Optimisation de l’interaction lumière-matière dans des métasurfaces absorbantes - nicolas.bonod@fresnel.fr

Cassier - Gralak


- Modélisation modale des résonateurs électromagnétiques dispersifs - maxence.cassier@fresnel.fr et boris.gralak@fresnel.fr

Da Silva


- Tomographie PhotoAcoustique pour l’imagerie multiphysique de tissus biologiques - anabela.dasilva@fresnel.fr

Duboisset


- In vivo imaging of oyster with nonlinear microscopy - julien.duboisset@fresnel.fr et virginie.chamard@fresnel.fr

Eyraud - EN
Inner structure imaging of small solar bodies


- Inner structure imaging of small solar bodies. christelle.eyraud@fresnel.fr

Litman - Tortel


- Inverse design algorithms for deriving new functional electromagnetic devices - amelie.litman@fresnel.fr and herve.tortel@fresnel.fr

Lumeau


- Développements de composants multicouches microstructurés pour l’imagerie multispectrale - Julien.lumeau@fresnel.fr et franck.chollet@femto-st.fr

Sabouroux


- Capteur de glycémie non invasif - pierre.sabouroux@fresnel.fr

Sentenac


- Random Illumination Microscopy - anne.sentenac@fresnel.fr


Wagner


- Composants durables pour la photonique de puissance en régime nanoseconde - frank.wagner@fresnel.fr et jean-yves.natoli@fresnel.fr

Zolla - Renversez


- Theoretical/numerical photonics: wave propagation in complex structures - gilles.renversez@fresnel.fr & frederic.zolla@fresnel.fr


Apply now & before April 15, for a PhD start in October 2020 !

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Ultra-sensitive stimulated Raman Microscopy
02-04-2019 - Thesis Offers

Summary :
The aim of this project is to develop an ultra-sensitive background free microscopy scheme for vibrational imaging by means of stimulated Raman scattering (SRS) with application in chemistry, pharmacology and biomedical imaging.

Supervisor:
Hervé RIGNEAULT

Team :
MOSAIC

More details can be found at:
imabio-cnrs.fr

Start date : April 2019

End date: December 2019

Polarized Enhanced Coherent Raman Scattering
02-04-2019 - Thesis Offers

Summary :
The aim of this project is to exploit light polarization in nonlinear microscopy to optimize the matching efficiency between optical fields and molecular responses. It will bring novel solutions to background-free nonlinear imaging with enhanced sensitivity.

Supervisor :
Sophie BRASSELET

Team :
MOSAIC

2 available PhD positions (starting 2019) in the mosaic team in the frame of the MUSIQ H2020 EU ITN project : www.musiq-etn.eu

Start date : April 2019
End date: December 2019

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Optical imaging deep in scattering media
21-03-2019 - Thesis Offers

Resume :
Adaptive optics, optimizes a wavefront using nonlinear generated signal as a feedback. In this project, we want to develop an adaptive optics approach to non-linear microsscopy.

Team :
MOSAIC

Supervisors:
Sophie BRASSELET
Dmitry NUZHDIN

Start date of the offer : 1st April 2019
End date of the offer : 30th september 2019

Optical transport properties of a mouse spinal cords
21-03-2019 - Thesis Offers

Resume :
The goal of this project is to reproduce the techniqe in the lab of MOSAIC group, creating a new setup for in situ routine study of mouse spinal cord scattering properties.

Team :
MOSAIC

Supervisors:
Sophie BRASSELET
Dmitry NUZHDIN

Start date of the offer : 1st April 2019
End date of the offer : 30th september 2019

Biological tissue modeling for non-linear microscopy applications
21-03-2019 - Thesis Offers

Resume :
We model light propagation in biological tissue using finite-difference time domain method to understand the intrisic properties of the model system (i.e. mouse spinal cord) and to be able to simulate it without need for an actual experiment.

Team :
MOSAIC

Supervisors:
Sophie BRASSELET
Dmitry NUZHDIN

Start date of the offer : 1st April 2019
End date of the offer : 30th september 2019

Inner structure imaging of small solar bodies
18-01-2019 - Thesis Offers

Abstract :
This Phd thesis aims to develop new approaches for imaging large structures, with an application to small bodies of the solar system.

Team :
HIPE

Supervisor :
Christelle EYRAUD

Development of broadband and monochromatic optical monitoring strategies for magnetron sputtering depositions
02-10-2018 - Thesis Offers

Abstract :

In this thesis, we propose to explore the combination of both monochromatic and broadband optical monitoring techniques. These developments will be done in collaboration between the Thin Film Research Team at institut Fresnel in Marseille and Bühler company.

Supervisors : Dr Thomas Begou and Julien Lumeau at Institut Fresnel
Dr Harro Hagedorn and Detlev Arhilger at Bühler Alzenau

Apply at : Julien LUMEAU

Team : RCMO

Understanding the nanoscale correlation between morpho-chemical, mechanical and optical properties of plant cell walls toward biofuel applications
04-09-2018 - Thesis Offers

Abstract :

The aim here is to investigate the morphological, chemical, mechanical and optical properties of wood sheets constraint to abiotic stresses directly acting on the tree/branch growth.

Superviseurs : Anne CHARRIER and Aude LEREU

Team : CONCEPT and CINAM

Engineering light scattering in optical interference coatings
04-09-2018 - Thesis Offers

supervisors : Myriam ZERRAD
Michel LEQUIME
Claude AMRA