Three-year PhD fellowship position in optical microscopy detection of nanoplastics exploiting UV autofluorescence and nanophotonics for enhanced sensitivity

JOB /OFFER DESCRIPTION

The widespread use of plastic materials has led to a growing environmental crisis, with micro- and nanoplastics posing significant challenges. Nanoplastics, defined as plastic particles smaller than 1 µm, present the greatest threat due to their potential for deeper biological penetration and long-term persistence. While current analysis methods are effective for detecting particles larger than 3 µm, the identification and quantification of nanoplastics remain a major technological hurdle.

This PhD project aims to break new ground in the quantitative detection of nanoplastics by exploiting time-resolved ultraviolet (UV) autofluorescence. Plastics emit intrinsic autofluorescence when illuminated in the UV, providing superior sensitivity to current Raman and infrared spectroscopies. The central objective is to improve detection sensitivity thanks to this autofluorescence property, targeting particles as small as 30 nm in diameter. A further original feature is the ability to differentiate between types of plastic by exploiting their autofluorescence lifetime.

This approach requires the development of advanced characterization techniques, as well as a deeper understanding of the UV emission of nanoplastics. This PhD fellowship project addresses this gap by integrating cutting-edge advances in spectroscopy, nanophotonics, and the synthesis of calibrated plastic nanoparticles. The project builds on the partner laboratories recent progress and preliminary results, benefiting from a highly complementary expertise between the collaborating teams.

This novel UV-based detection approach promises unprecedented sensitivity, the ability to detect nanoscale particles, and a direct, label-free detection method well-suited for in situ applications. By pushing the boundaries of nanoplastic detection, the project will provide critical tools for better understanding and quantifying this invisible yet pervasive form of pollution.

The Institut Fresnel is a research state laboratory based in Marseille / France, devoted to research and higher education with affiliation to both CNRS and Aix Marseille University. Institut Fresnel is seeking to recruit talented, enthusiastic young scientists who are highly motivated to boost their research career in the areas of optical microscopy, nanosciences, biosensing, and nanobiotechnologies. Jerome Wenger’s group has acquired a wide expertise in the nanoscale control of light fields in plasmonic nanostructures and its application to enhance fluorescence spectroscopy applications.

The PhD fellowship is offered for a period up to three years. Extensions will be possible based on context and performance. A PhD degree from Aix Marseille University will be granted after successful completion of the PhD research.

Web Links www.jeromewenger.com www.fresnel.fr

TYPE OF CONTRACT:

TEMPORARY

JOB STATUS:

FULL TIME

HOURS PER WEEK:

38

APPLICATION DEADLINE

31/05/2026 00:00

ENVISAGED STARTING DATE:

01/10/2026

ENVISAGED DURATION

36 months

JOB NOT FUNDED THROUGH AN EU RESEARCH FRAMEWORK PROGRAMME

WORK LOCATION(S):

Institut Fresnel, faculté des sciences de St Jerome, 52 avenue Escadrille Normandie Niémen, 13013 Marseille, France

WHAT WE OFFER:

1. Close supervision by an internationally recognized expert.
2. Access to state-of-the-art equipment and technology, allowing to perform cutting-edge research and stay at the forefront of the field.
3. The opportunity to work on groundbreaking research projects that have the potential to make a significant impact in science and technology.
4. Personal and professional development training, including leadership and communication skills to prepare for a successful career in academia or industry.
5. The opportunity to develop a diverse set of transferable skills and gain valuable experience that will be highly sought after by employers in academia and industry.

QUALIFICATIONS, REQUIRED RESEARCH FIELDS, REQUIRED EDUCATION LEVEL, PROFESSIONAL SKILLS, OTHER RESEARCH REQUIREMENTS

To apply for a PhD fellowship, candidates must hold or be in the final stages of completing an internationally-recognized Master-equivalent degree in physics or engineering. Experience in experimental research on nano-optics and/or optical microscopy would be highly appreciated, but is not mandatory. No restrictions of citizenship apply to the PhD fellowship.

Soft skills:Strong motivation, curiosity, English for science, autonomy, analytical and critical thinking, writing skills, presentation skills

REQUESTED DOCUMENTS OF APPLICATION, ELIGIBILITY CRITERIA, SELECTION PROCESS

Suitable candidates are requested to submit:

• a Curriculum Vitae
• a presentation letter with declaration of interests and a description of your past achievements (max. 1 page)
• contact email of two potential references
• a scanned copy of your university academic transcripts in English
• a scanned copy of the Master degree, if available at the time of application
• a scanned copy of standardized English test results (TOEFL, TOEIC,) if available

HOW TO APPLY:

Jerome.wenger@fresnel.fr