Job opportunities

, by Arnaud Garnache

Postdoctoral position in Optoelectronics & Laser physics

Subject : Modeless semiconductor laser for signal processing
Contact the research team leader Arnaud Garnache.

IES (Institute of Electronics & Systems, Photonic and waves department – University Montpellier, F) have funding for a postdoctoral fellowship in the area of Optoelectronics and Laser physics. IES is a world leader in the field of highly coherent III-V semiconductor surface emitting laser (VCSEL) emitting non-conventional light state, and in optical/RF noise physical study, which find diverse applications in low noise photonic sensors and THz source.
The fellow will work to investigate the potentialities of a new class of modeless laser, so-called frequency-shifted-feedback laser or Talbot lasers, for both civil and defense applications. To generate such laser beam at high power with robust and functional devices, we will take advantage of III-V semiconductor VCSEL in an external cavity configuration. The fellow will participate in the development of advanced semiconductor nanostructure based VCSEL, new compact FSF laser cavity architecture, and will carry out laser field coherence study in the optical and RF domain (intensity/phase fluctuations metrology). Multiphysics modeling and study will be carried out (thermal, electronic, optical, mechanical), in order to achieve target laser performances dedicated to highly demanding applications. The goal of the project is to develop a new laser system to be applied to analog signal processing and chirp laser seeding, in collaboration with academic and industrial partners.
The fellow will join a dynamic center of optoelectronics research with a good publication record and strong research links in other countries. The fellow will work with three senior scientists. Facilities include clean room, laser/optics labs and good access to the scientific literature. The fellow will work in collaboration with other teams: C2N-CNRS (Centre de Nanosciences et de Nanotechnologies, Paris-Saclay, F), LiPHY (Laboratoire Interdisciplinaire de Physique, Grenoble, F), THALES TRT (Palaiseau, F), CEA Laser Mega Joule (Aquitaine, F), and INNOPTICS company (Talence, Route des lasers, F).
Applications are invited from applicants holding a PhD in physics, optoelectronics, or a related research area. Applicants should have a strong interest in semiconductor physics and technology, laser physics and optics, RF signal processing and noise, a promising research record, and good practical skills. The fellowship has a (pensionable) salary of €32,000 p.a. and is funded by the National Research Agency (TAPAS ASTRID project). Please send a CV including names of two referees by e-mail to the team leaser.

Research Director CNRS
Univ. Montpellier, France
Ph : +33 467.143.476

PhD Positions

The team offers PhD position across the full range of its research, and welcomes enquiries at any time: you may contact the research team leader directly.

Subject #1 : Bio-photonic sensor and THz source based on a nanostructure laser exhibiting exotic photon state : VORTEX
Contact the research team leader Arnaud Garnache.

Our Institute (Institute of Electronics & Systems, Photonic and waves department – University Montpellier) is a world leader in the field of highly coherent III-V surface emitting semiconductor laser (VCSEL) for applications to low noise photonic sensors and coherent THz sources.
The goals of this PhD work are the conception, fabrication, and physical study of a new high power single frequency laser device exhibiting a high coherence exotic beam, patented by our laboratory, in order to develop advanced sensors and THz sources. It exhibits in addition to a classical “mechanical” linear momentum, an orbital angular momentum (optical VORTEX) at one photon level, and a possible dual-frequency operation. To generate such a laser beam, this device will take advantage of air-gap VCSEL technology, integrating a new photonic-crystal based mirror, in order to "shape" the exotic photon state. Indeed these photonic-crystal based nanostructures allow enhancing light-matter interaction, combined with integration. The goal is to develop a speed sensor and optical tweezers for bio-photonics, and coherent THz sources based on agile dual-frequency light emitters.
To develop this device, the PhD student will work on the modelization (FDTD, finite element simulations), III-V technology fabrication (lithography, evaporation, etching) and photonic crystal based VCSEL structure characterizations. While the photonic device will be mature, the PhD student will work on the physical study and modelization of the optical and thermal properties of coherent laser emission, to target applications. A lab prototype (as the case may be an industrial one) will be developed for application to speed sensors and optical tweezers, and to coherent THz sources.
This project deals with technology, modelization and physical study, and also with applications.
This work will be carried out in collaboration with several academic institutes (IOGS Bordeaux, LPN Marcoussis, CBS Univ.Montpellier, LOMA Univ. Bordeaux, IMEP-LAHC Grenoble INP) and a company (INNOPTICS).

Keywords: Photonic sensor, Semiconductor Laser, Optics, Bio-photonics, Optical tweezers, THz

Subject #2 : Laser Ranging by means of III-V NIR higly coherent source for agro-environment : development and study for technology transfer
Contact Mikhaël Myara for more informations.
IES is a world leader for many years in the III-V semiconductor lasers field of VECSEL type, whose high spatial and temporal coherence properties, married to power and versatility, have been demonstrated in the laboratory. These compact laser source technology is now mature for a technology transfer with a company (Innoptics Inc.), in the context of a project funded by the SATT AxLR.
These VECSEL sources also have the particularity to generate unconventional coherent beams with exotic properties, either spatially or temporally or in polarization. In this field, we have recently demonstrated generation of high order beams (including optical Vortex), coherent wide spectrum emission (also called modeless laser) .... These results define the state of the art in this field.
During this thesis, we will exploit these new coherent light states for long range laser telemetry applications, including optical feedback configurations, to achieve high sensitivity, self-aligned and compact sensors. The range of applications is wide: anemometry, particle size, high resolution and long distance telemetry, etc.
This work deals with fundamental and exploratory research about non-conventional coherent states, in order to develop these sensors and carry multi-physical study and together with optimization of the laser for the targeted applications. It is also an applied work due to itsapplication potential for an industrial transfer.
This subject requires both optoelectronic and optical / laser skills, but also abilities in signal processing (digital and analog) for metrology and sensor features.