Fixed-term Researcher in Sub-Terahertz Radiating Systems (M/F)

Job Description

Missions

Terahertz (THz) detection and imaging are currently of significant importance due to the wide range of expected applications, including non-destructive testing, detection of hidden objects, identification of gases or molecules, and environmental monitoring, as well as their impact on strategic sectors for national industry such as security, defense, and agronomy [1]. Current high-sensitivity terahertz (THz) detection at room temperature mainly relies on silicon-based technologies and their derivatives, such as resistive microbolometers or FET transistor cameras [2],[3].

This project aims to develop a disruptive technological solution for high-sensitivity THz detection and imaging operating at room temperature, based on the integration of thermoelectric sensors deposited on suspended polyimide membranes and highly efficient THz absorbing metasurfaces. This approach fundamentally differs from conventional resistive bolometric technologies and enables low noise equivalent power, high specific detectivity, and low power consumption. In particular, the mission is to design and optimize THz absorbing structures integrated into the detector's upper layer, in order to enhance absorption efficiency and tailor the spectral response of the devices (broadband, narrowband or multiband) [4]. This work relies on the electromagnetic analysis and dimensioning of sub-wavelength patterned metasurfaces, primarily based on periodically arranged unit cells. Semi-analytical approaches using equivalent circuit models are employed for rapid pre-design and material selection, followed by full-wave numerical optimization using finite element methods [5].

[1] C. Jansen, et.al., "Terahertz imaging: applications and perspectives," Appl. Opt. 49, E48-E57 (2010).
[2] P Hillger, J Grzyb, R Jain, UR Pfeiffer, "Terahertz imaging and sensing applications with silicon-based technologies," IEEE Transactions on Terahertz Science (2018).
[3] Simoens, F., Meilhan, J. & Nicolas, JA. "Terahertz Real-Time Imaging Uncooled Arrays Based on Antenna-Coupled Bolometers or FET Developed at CEA-Leti," J Infrared Milli Terahz Waves 36, 961–985 (2015).
[4] H. Tao, N. I. Landy, C. M. Bingham, X. Zhang, R. D. Averitt, W. J. Padilla A metamaterial absorber for the terahertz regime: Design, fabrication and characterization, Optics Express 16(10):7181-8, May 2008.
[5] L. Chen, S. -W. Qu, B. -J. Chen, X. Bai, K. -B. Ng and C. H. Chan, "Terahertz Metasurfaces for Absorber or Reflectarray Applications," IEEE Trans. Antennas Propag., vol. 65, no. 1, pp. 234-241, Jan. 2017.

Activity

The researcher will contribute to the electromagnetic analysis, design and optimization of THz absorbing metasurfaces based on sub-wavelengthn ordered patterns in order to maximize absorption efficiency and control the operational bandwidth of the detectors based while respecting the constraints linked to compatible materials.
- The researcher will participate in numerical modeling and simulation of absorber structures using analytical and full-wave electromagnetic simulations, taking into account material constraints and microfabrication compatibility.

Your Profil

Skills

- Hold a PhD in Electrical Engineering, Photonics, or Physics.
- Have skills in the fields of antennas, microwaves, and numerical modeling. Good knowledge of THz electronics or photonics will be appreciated.
- Skills and qualities: experience working in a multicultural team, ability to report effectively.
- Languages: English (B2 level of the Common European Framework of Reference or higher).

Your Work Environment

This offer is part of a French national project funded by the National Research Agency (ANR). This interdisciplinary project will be conducted at IETR – UMR CNRS 6164 (www.ietr.fr).

Compensation and benefits

Compensation

Between 2 991 € and 4 166 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

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