PhD student : Study of Silicon photonics devices at very low temperature (M/F)
New
- FTC PhD student / Offer for thesis
- 36 months
- BAC+5
This offer is available in English version
This offer is open to people with a document recognizing their status as a disabled worker.
Offer at a glance
The Unit
Centre de Nanosciences et de Nanotechnologies
Contract Type
FTC PhD student / Offer for thesis
Working hHours
Full Time
Workplace
91120 PALAISEAU
Contract Duration
36 months
Date of Hire
01/10/2026
Remuneration
2300 € gross monthly
Apply Application Deadline : 12 August 2026 23:59
Job Description
Thesis Subject
Optical communications are now at the core of the Internet and enable the development of an interconnected society. However, to meet the requirements of future communication system applications, optical circuits must become faster, more cost-effective, more compact, and more energy-efficient. Silicon photonics has demonstrated significant progress through the development of efficient devices and integrated circuits. Nevertheless, silicon suffers from intrinsic limitations, including two-photon absorption (TPA), the absence of the Pockels effect, and thermal sensitivity. A promising alternative is the use of a silicon nitride (SiN) platform, which is compatible with silicon technology and exhibits extremely low propagation losses. The objective of this work is to optimize silicon nitride (SiN) technology to achieve waveguide propagation losses below 0.2 dB/cm.
To date, studies on both silicon and silicon nitride components have been conducted at room temperature or at temperatures up to 100°C (373 K). In this project, we aim to investigate their behavior at 4 K and in the millikelvin range, and to develop new device structures that are more robust at cryogenic temperatures.
The successful candidate will optimize the entire fabrication process, including lithography, etching, and thermal annealing, to improve the performance of optical components. They will also develop the complete optical and DC packaging processes and carry out the characterization and testing of the fabricated devices. The candidate will focus on the evolution of the nonlinear optical properties of these components at ultra-low temperatures.
Your Work Environment
The work will be carried out at the Centre for Nanoscience and Nanotechnology (C2N) in collaboration with CEA-Leti as part of the Q-LOOP project.
Constraints and risks
The project involves work in a cleanroom environment and the use of laser-based experimental setups.
Compensation and benefits
Compensation
2300 € gross monthly
Annual leave and RTT
44 jours
Remote Working practice and compensation
Pratique et indemnisation du TT
Transport
Prise en charge à 75% du coût et forfait mobilité durable jusqu’à 300€
About the offer
| Offer reference | UMR9001-LAUVIV-014 |
|---|---|
| CN Section(s) / Research Area | Micro and nanotechnologies, micro and nanosystems, photonics, electronics, electromagnetism, electrical energy |
About the CNRS
The CNRS is a major player in fundamental research on a global scale. The CNRS is the only French organization active in all scientific fields. Its unique position as a multi-specialist allows it to bring together different disciplines to address the most important challenges of the contemporary world, in connection with the actors of change.
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