Reference : UMR6303-PIECOL-003
Workplace : DIJON
Date of publication : Wednesday, June 15, 2022
Scientific Responsible name : Dr. Pierre COLMAN
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2022
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
The SAFIR team at the ICB Lab (Dijon, France) is hiring a Ph.D. student to investigate all-optical control in arrays of micro-photonic waveguides.
The equations that govern the propagation of light in waveguide arrays bare strong similarities with the Schrödinger equation which describes the temporal evolution of quantum systems. As such, optical effects analogue to the Bloch Oscillations or dynamic localization have been demonstrated. Previous limitations in the nano-fabrication processes restricted the experimental investigations to large waveguide arrays: (electronic-like) band effects could be studied, but not the transition between discrete levels of energy. Nowadays, it can be possible to implement optically the techniques that are used to control excitons in Quantum Electro-Dynamics (QED).
The first outcome of this thesis will be the experimental demonstration that QED technique can be indeed used to implement on-chip all-optical control functions such as for instance complex switching and commutation arrays, spectral filters, etc. This includes the nano-fabrication of micro-photonic chips in Silicon-Nitride; and their optical characterization. Then, the impact of the optical nonlinearity – which usually does not exist in QED- will be studied. In particular, we expect to unveil exotic nonlinear propagation regimes that do not have any equivalent in fibers optics. Finally, the geometry of the arrays of waveguides that will be studied here is very close to the toy models used in topological photonics (e.g. the Su-Schrieffer-Heeger model4). Hence, it will be investigated whether a link can be established between QED control in waveguide array and topological optics.
The thesis will take place within the framework of the national ANR-funded project NAC-NIP. This project holds at the same time very fundamental and theoretical aspects, as well as more applied and experimental demonstrations. Suitable candidate must then be eager to work on both aspects of the project.
The SAFIR team is specialized in nonlinear propagation phenomena in fibers-optics (https://icb.u-bourgogne.fr/en/safir-2/). In collaboration with the small clean room facility ARCEN hosted at the ICB, SAFIR now devoting part of its activities to the study of nonlinear phenomena in micro-photonics. This thesis will hence benefit from top grade environment regarding both optical experiment and nanofabrication
Constraints and risks
Specific risk involved about the job position:
- Laser manipulation and operation
- Handling of chemical and semi-conductor compounds (work in clean room facility)
This thesis will be held in the framework of the ANR funded NAC-NIP project (https://anr.fr/Projet-ANR-20-CE24-0007)
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