Stéphane Marcet

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The intrinsic near-infrared photoluminescence (fluorescence) of single-walled carbon nanotubes exhibits unique photostability, narrow bandwidth, penetration through biological media, environmental sensitivity, and both chromatic variety and range. Biomedical applications exploiting this large family of fluorophores will require the spectral and spatial(More)
The effect of additional doping of charge impurities was investigated in a ferromagnetic semiconductor Zn1-xCrxTe. It was found that the doping of iodine, which is expected to act as an n-type dopant in ZnTe, brought about a drastic enhancement of the ferromagnetism in Zn1-xCrxTe, while the grown films remained electrically insulating. In particular, at a(More)
Magnetic properties of a novel ferromagnetic semiconductor (Zn, Cr)Te were investigated. Zn1KxCrxTe thin films, both without and with the additional hole doping by nitrogen, were grown by molecular beam epitaxy. In the magnetization measurement on Zn1KxCrxTe without carrier doping, the ferromagnetic behaviors such as a hysteresis loop in the magnetization(More)
The efficacy of existing therapies and the discovery of innovative treatments for central nervous system (CNS) diseases have been limited by the lack of appropriate methods to investigate complex molecular processes at the synaptic level. To improve our capability to investigate complex mechanisms of synaptic signaling and remodeling, we designed a(More)
We report the growth of Mn-doped wurtzite GaN epilayers by nitrogen plasma-assited molecular beam epitaxy. The incorporation of manganese, achieved up to 18%, is found to be very sensitive to the growth conditions. Below about 2% of Mn, correlated structural and magnetic measurements of GaN:Mn clearly demonstrate that the coexistence of room-temperature(More)
We present the design of a confocal microscope adapted for optical spectroscopy and imaging at cryogenic temperatures. This system is based on the existing approach of partly inserting the optical components of the microscope inside a helium-bath cryostat. It provides a spatial resolution approaching the diffraction limit with a mechanical stability(More)
Mn-doped wurtzite GaN epilayers have been grown by nitrogen plasmaassisted molecular beam epitaxy. Correlated SIMS, structural and magnetic measurements show that the incorporation of Mn strongly depends on the conditions of the growth. Hysteresis loops which persist at high temperature do not appear to be correlated to the presence of Mn. Samples with up(More)
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