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In this subjet we will develop off-axis electron holography for the measurement of electrostatic fields in AlGaN quantum well structures for UV emission. Electron holography measures the phase of electrons from an interference pattern. As the phase change of the electrons is proportional to the potentiel in the specimen, then this can be used to […] >>

Detection of single photons boosted the development of quantum information processing, as well as finding a wide range of applications in astronomy, sensing, metrology, LiDAR, and biosensing technologies.(1) Single photon detectors (SPDs) require high quantum efficiency (>90%), low dark count rates, and ultra-fast response. State of the art superconducting nanowire SPD (SNSPD) can deliver superior […] >>

The aim of this thesis is to design high-efficiency power converters based on resonating piezoelectric transducers. A large part of the work is to develop the electrical cycle able to energetically maintain the piezoelectric resonator in resonance and ensure zero-voltage switching, for electrical energy transfer from the source to the piezoelectric resonator or from the […] >>

Redox photocatalysis is more and more popular in synthetic and pharmaceutical chemistry for preparing organic compounds is mild conditions. It aims to convert visible light absorbed by a photocatalyst into charges (electron and/or holes) with redox potentials well adapted for performing reduction and/or oxidation reactions. These reactions can be very efficient and enable the formation […] >>

The advance of LED micro displays requires high resolution and brightness for a wide range of applications such as smart phone or virtual reality. These new products specifications raise challenges in terms of pixels size and density, material integration and fabrication techniques. In this context, Gallium Nitride has been extensively used and studied for its […] >>