Fabien Vialla was awarded the PhD prize 2015 Cnano Île de France in basic research on October 6th, 2015. Fabien Vialla has done his PhD under the supervision of Christophe Voisin in the "coherent and nonlinear optics" group in Laboratoire Pierre Aigrain. This thesis was about exploiting the interaction of carbon nanotubes with their physicochemical environment to achieve a better control of their optoelectronic properties. Two major directions were studied in this work : the first one is related to the confinment of the low-energy acoustic phonons of the nanotubes to enhance the spectral purity of the light emitted by these nano-objects at low temperature. This spectral purity was improved by more than an order of magnitude through this approach. The second direction, developed in collaboration with the Laboratoire Aimé Cotton ENS Cachan, aims at changing the absorption properties of the nanotubes by coating their surface with a monolayer of dye molecules capable of absorbing light at specific wavelengths and of subsequently transfering the photon energy to the nanotube with high yield. This approach is very promising for applications in photovoltaics or biological labeling, for example.
Here are few publications from his PhD work
C. Roquelet, F. Vialla et al., ACS nano 6, 8796 (2012)
F. Vialla et al., Phys. Rev. Lett. 111, 137402 (2013)
F. Vialla et al., Phys. Rev. Lett. 113, 057402 (2014)