M/F Doctorant

Job Description

Thesis Subject

Actives an passive Mid-infrared integrated photonic devices on III-V semiconductor plaform

Your Work Environment

The goal of the thesis is to develop active and passive mid-infrared integrated photonic components based on a low loss integrated waveguide platform. The PhD student will perform the design, fabrication and characterization of passive devices such as ring or racetrack resonators, splitter, filters, interferometrs or integrated active devices based in inter-sub-band transitions such as modulators, detectors or amplifier. The material systems that will be investigated are and InGaAs/InP-on-InP. The subtle design of optical waveguide features such as optical refractive index contrast, free carrier absorption and geometric parameters will be a primordial element that will be taken into account. Operation will be optimized for the -9 µm and 4.6 µm wavelength range. The sample characterizations will take place with a dedicated end fire coupling setup equipped with a variety of mid-IR laser sources (allowing to control the injected wavelength, power and polarization) and detectors. She/he will benefit from the experience of the host team (https://odin.c2n.universite-paris-saclay.fr/en/activities/mir-thz-devices/) in quantum and electromagnetic design of opto-electronic devices, of cleanroom fabrication, and device opto-electronic characterizations. Recent achievement in the hosting team shows promising results on the way to kerr frequency comb generation.

Constraints and risks

Applications relying on mid-infrared radiation (3-12 μm wavelenght) have progressed at a rapid pace recently, stimulated by scientific and technological breakthroughs. For instance MIR cameras have enabled thermal imaging and the invention of the quantum cascade laser (QCL) has enabled a vast range of applications in spectroscopy, metrology, medicine. In addition to the generation and detection of light, a key functionality for most photonic systems is the possibility to electrically control the amplitude, phase, and polarization of a laser beam up to ultrashort time scales. Contrary to the visible and near-IR range, in the MIR range passive or active integrated components such as modulators and directional couplers do not exist, but recent experiments have revealed propagation losses less that 1dB/cm. In this context, the host team has recently developed passive integrated waveguides on III-V semicondutor plaforms (InGaAs/InP and AlGaAs/GaAs), and identified the opportunity of greatly improving the propagation losses at longer wavelengths.d'onde de 4,6 µm et 9 µm.
La caractérisation des composants sera réalisée à l'aide d'un banc expérimental dédié au couplage par la tranche (end-fire coupling), équipé de différentes sources laser accordables dans le moyen infrarouge permettant de contrôler précisément la longueur d'onde, la puissance et la polarisation injectées, ainsi que de détecteurs adaptés à cette gamme spectrale. Le doctorant ou la doctorante bénéficiera de l'expertise de l'équipe d'accueil (https://odin.c2n.universite-paris-saclay.fr/en/activities/mir-thz-devices/) en modélisation quantique et électromagnétique des dispositifs optoélectroniques, en microfabrication en salle blanche et en caractérisation optoélectronique des composants. Les résultats récents obtenus par l'équipe, notamment sur des résonateurs intégrés à haut facteur de qualité, ouvrent des perspectives prometteuses pour la génération de peignes de fréquences de Kerr intégrés dans le moyen infrarouge.

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

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.

CNRS

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