Thèse Interfaces et Métasurfaces Optoélectroniques Avancées pour des Applications Terahertz Innovantes H/F

Doctorat.Gouv.Fr

Établissement : Université de Limoges École doctorale : Sciences et Ingénierie Laboratoire de recherche : XLIM Direction de la thèse : Xavier ROMAIN Début de la thèse : 2026-10-01 Date limite de candidature : 2026-06-08T23:59:59 This PhD thesis will focus on designing, developing and characterising THz modulators by exploiting relevant combinations of the state-of-the-art strategies mentioned above. Using thin films of conductive polymer, transparent conductive oxide or phase-change materials, this project will investigate how to dynamically reconfigure modulation of THz waves in semiconductors such as silicon. One particular emphasis would be made on exploring optoelectronically driven photomodulation for demonstrating low-tech THz modulation and imaging.
The PhD student's research activities will be centered on:
- Fabricating semiconductor-based THz modulators.
- Developing experimental techniques based on THz Time-Domain Spectroscopy (THz-TDS) for characterising photomodulation properties.
- Demonstrating dynamic modulation of THz waves at low-voltage and low-photomodulation power.
- Developing photomodulation scheme for low-tech THz imaging.
- Disseminating results in peer-reviewed articles and at national and international conferences.
This PhD thesis will be the opportunity to address challenges in fabrication and optoelectronic instrumentation and to experimentally demonstrate original proof-of-concept of alternative THz modulation scheme. Over the past decades, modulation of THz radiations [1] has been increasingly studied for applications such as in security, biomedicine and future wireless communications. Modulation strategies based on advanced materials, such as optoelectronic metasurfaces [2], photomodulating semiconductors [3], [4] or phase-change materials [5], constitute promising platforms for next-generation THz technologies.