IEMN is a major player in the design and development of optoelectronic THz sources. The "THz Photonics" team of the IEMN - which proposes this contract - has recently demonstrated the generation of THz waves by optoelectronic means with unequalled output power and efficiency. This source is based on the photodetection of a beat of two laser beams and requires the development of very high bandwidth semiconductor photodetectors.

Within the framework of the Photowathz project financed by the Hauts de France region, the Photonique THz team aims to go even further in terms of power, spectral purity and tunability. To do this, new generation photodetectors, with distributed architecture[1] optimized to operate with lasers of wavelength 1060nm will be designed, manufactured and characterized. The stakes of this project are high, since it will demonstrate the feasibility of a THz source without equivalent today.

The Engineer will be responsible for the design and manufacture of photomixers. To do so, he will:

• Design the photomixer using RF and photonic simulation software (CST, Lumerical, etc)
• To make the CAD of the lithography masks.
• Carry out the steps in a clean room environment (resin coating, electronic/optical lithography, metallization, PVD deposits, plasma etching).
• Characterize the samples during the manufacturing process (AFM, profilometer, optical and electronic microscopy, electrical characterization).

To carry out this mission, the engineer recruited will rely on the technological expertise of the team and all the personnel of the clean room.

[1] F. Bavedila et al.Development of a millimeter-long Travelling wave THz photomixer. J. Light. Technol., vol. 39, no. 14, pp. 4700-4709, 2021, doi: 10.1109/JLT.2021.3078226.

He/she must have a good experience in cleanroom component technology and have successfully completed the various technological steps inherent in the manufacturing of semiconductor devices. A first experience in the fabrication of semiconductor devices (MEMS, diodes, photodetectors, transistors...) in clean room is essential. Experience in the characterization of optoelectronic devices would be a plus.

• Provide technical and scientific support for engraving equipment (DRIE, RIE, ICP)
• Maintain this equipment.
• Development of calibration procedures.
• Expertise in component manufacturing tools (lithography, deposition, etching) and characterisation methods (electron microscopy, ellipsometry, profilometry, AFM, etc.).
• Keeping a technology watch.

• General knowledge of chemistry and physical sciences
• Knowledge of manufacturing techniques (engraving, lithography, deposits)
• General knowledge of instrumentation and physical measurements
• Knowledge of vacuum techniques (primary vacuum, secondary vacuum)
• Handling of gases under pressure
• Aptitude for teamwork and multi-project objectives
• General knowledge of health and safety rules
• Mastery of the English language: oral and written expression and comprehension.

The IEMN is a 450-strong research institute. Its multidisciplinary research activities cover a broad spectrum, from materials physics to telecommunications systems.

Its research activities are based mainly on five technical services: the Micro and Nano Fabrication Centre (CMNF), the near-field microscopy platform, the HF-MEMS (Micro-Electro-Mechanical-Systems) electrical characterisation centre, the telecoms platform and the EMC (Electro-Magnetic Compatibility) platform.