Development of a mid-IR degenerate pump-probe setup (M/F)

Job Description

Missions

We have an opening for a two-year (initially) post-doctoral appointment at University Paris Saclay (France) and CNRS, with the Centre for Nanosciences and Nanotechnologies (C2N). You will integrate the Mid-IR /THz Quantum Devices Team, specialized in the development of novel optoelectronic devices
exploiting quantum electrodynamics effects at mid-infrared wavelengths [1] [2]. Located south of Paris, University Paris Saclay extends across a vast local area and is ranked as France's top university.
The salary level can be negotiated depending on the candidate experience. The project is supported by an ERC Advanced Grant (project SMART-QDEV).

The goal of this project is to develop a degenerate pump-probe setup operating in the mid-IR, based on a OPA (optical parametric amplifier) already available in the lab, tunable from 0.6 to 12 um.

1. M. Hakl, Q. Lin, S. Lepillet, M. Billet, J.-F. Lampin, S. Pirotta, R. Colombelli, W. Wan, J. C. Cao, H. Li, E. Peytavit, and S. Barbieri, "Ultrafast Quantum-Well Photodetectors Operating at 10 μm with a Flat Frequency Response up to 70 GHz at Room Temperature," ACS Photonics 8, 464–471 (2021).
2. M. Malerba, S. Pirotta, G. Aubin, L. Lucia, M. Jeannin, J.-M. Manceau, A. Bousseksou, Q. Lin, J.-F. Lampin, E. Peytavit, S. Barbieri, L. H. Li, A. G. Davies, E. H. Linfield, and R. Colombelli, "Ultrafast (≈10 GHz) mid-IR modulator based on ultrafast electrical switching of the light–matter coupling," Appl. Phys. Lett. 125, 41101 (2024).
3. M. Knorr, J. M. Manceau, J. Mornhinweg, J. Nespolo, G. Biasiol, N.-L. Tran, M. Malerba, P. Goulain, X. Lafosse, M. Jeannin, M. Stefinger, I. Carusotto, C. Lange, R. Colombelli, and R. Huber, "Intersubband Polariton-Polariton Scattering in a Dispersive Microcavity," Phys. Rev. Lett. 128, 247401 (2022).

Activity

Applications relying on mid-infrared radiation (MIR, 3-12 um) have progressed at a very rapid pace in recent years. In particular, the ultra-fast character of mid-IR devices is becoming central to many applications, with the development of ultra-fast detectors [1] and ultra-fast modulators [2] attracting a lot of attention. In this context, the possibility of ultra-fast optical characterizations in the mid-infrared range is an important research asset [3].
The goal of this project is to develop a degenerate pump-probe setup operating in the mid-IR.
The first step of the project will consist of designing and implementing the optical layout of the setup. This includes splitting the OPA output into a pump and a probe beam, setting up a variable optical delay line with sufficient range and resolution to resolve (sub)-picosecond dynamics.
A second key aspect concerns the detection scheme. Since the setup is degenerate, pump and probe pulses share the same wavelength, which requires a robust strategy to isolate the probe signal from the scattered pump light.
The perspective candidate will also develop the acquisition software (based on Auto-Lab or PyMeasure), including motorized delay line control, synchronization with the detection electronics, data acquisition routines.

Your Profil

Skills

The project is experimental. We are looking for motivated and experienced candidates in some (but not all) of the following areas: semiconductor device physics and technology; electromagnetic modeling; cleanroom fabrication; laser physics; optoelectronic characterization techniques; quantum heterostructure design; RF/microwave technology.
The successful candidate must hold an experimental PhD in physics, optics, or engineering. The position is available immediately.

Your Work Environment

Funding is provided by an ERC Advanced Grant.

The work will take place at the Center for Nanoscience and Nanotechnology, on the Plateau de Saclay.
The Center for Nanoscience and Nanotechnology (C2N) is a joint research unit of CNRS, Paris Saclay University, and Paris Cité University. The C2N, with approximately 410 staff, is located in Palaiseau (91), at the heart of the Paris Saclay campus.
C2N encompasses four scientific departments (photonics, materials, nanoelectronics, and nanobiofluidic microsystems). This position is located within the photonics department. This position requires access to the cleanroom.

Constraints and risks

N/A

Compensation and benefits

Compensation

between 3081.22 Euros and 4291.70 Euros gross per month

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

The research professions