Christophe Voisin is professor at the University of Paris, honorary member of the IUF 5institut Universitaire de France); he carries out his research in the physics laboratory of the École Normale Supérieure. His area of ​​expertise concerns the optical and electronic properties of nano-structures. More specifically, his recent contributions concern:

Quantum photonics using carbon nanostructures (nanotubes, graphene quantum dots)
Femtosecond spectroscopy of electronic and vibrational states of hybrid (organic / inorganic) and metallic nanostructures
The study of energy exchanges between an out-of-equilibrium Dirac electron gas and a hyperbolic substrate by spectroscopy (electronic and optical) of thermal fluctuations in a graphene channel transistor.

He teaches physics at all levels for undergraduate up to master students  both at the University of Paris and at the ENS (Ecole Normale Superieure)

Since 2017, he has also been director of the research network “Graphene and co” (GDR 3217 of the CNRS) devoted to 2D materials of the graphene family and their derivatives.

Contact

LE126
0144323845 L065
0144322556 GH013
  GH014
0144323842
LPENS
Laboratoire de physique
de l’Ecole normale supérieure
24 rue Lhomond 75005 PARIS

Publications

Selection of recent publications:
  • C. Raynaud et al., “Superlocalization of excitons in carbon nanotubes at cryogenic temperature”, Nano Letters 19, 7210 (2019)
  • X. We et al., “Carbon nanotubes as emerging quantum-light sources”, Nature Materials 17, 663 (2018)
  • W. Yang et al., “A graphene Zener-Klein transistor cooled by an hyperbolic substrate”, Nature Nanotechnology 13, 47 (2018)
  • S. Zhao et al., “Single photon emission from graphene quantum dots at room temperature”, Nature Communications 9, 3470 (2018)
  • A. Jeantet et al., “Widely tunable single photon source from a carbon nanotube in the Purcell regime”, Phys. Rev. Lett. 116, 247402 (2016)

Full publication list.

Curriculum Vitae

Presently
  • Professeur at University of Paris
  • Director of GDR 3217 “Graphene and co”
  • Team leader: “Nano-optics” at LPENS
Curriculum and previous positions :
  • 1993-1998 : Student at Ecole Normale Supérieure de Cachan and Université of Paris Sud (Orsay)
  • 1996 : Agrégation of physics (teaching habilitation)
  • 1998-2000 : PhD (Quantum optics lab., Ecole Polytechnique, Université Paris Sud), PhD Adv.  : Fabrice Vallée.
  • 2001: post-doct at LPMC, ENS, Paris
  • 2001-2011 : Assistant professor at ENS, in Laboratoire Pierre Aigrain.
    • 2001-2006: deputy director of the preparation center for physics agregation (ENS, P6, P7, P11, Montrouge)
    • 2007-2009 : Supervisor of the L3 curriculum at the physics department, ENS
  • 2006-2007 : Visiting scientist at Columbia University (New York, USA),  T. Heinz group.
  • 2009 : HDR (Habilitation) at Université Pierre et Marie Curie
  • 2011- : Professeur à l’Université Paris Diderot (now Université of Paris)

 

Download full CV :

Research topics

A detailed presentation of my research activities is available on the web page of the Nano-optics team. See in particular the sections “Carbon nanotubes” and “Van der Waals heterostructures”.

Experimental techniques

Laser sources
Most of our experiments are based on the use of lasers running a wide spectral range, from infra-red to visible. Some are impulse (femto-second) to allow great temporal resolution (study of energy transfers, electron dynamics, etc.), others are continuous to offer the best spectral resolution.

Many of them use non-linear optical techniques, such as the optical parametric amplifier photographed in the image opposite.

Main research topics

The object of my research concerns the light-matter interaction and its ultimate limits where a single photon exchanges energy with an electronic quantum state. This interaction is enhanced by various photonic techniques (such as fibered micro-cavities). The electronic states are obtained on artificial systems (nanostructures) which increase the strength of the interaction tenfold and whose characteristic parameters can be adjusted at will by controlling the shape and composition of the nanostructure.

Teaching

Lectures :

  • Nano-photonics (M1, FIP)
  • Introduction to solid state physics (L3)
  • Quantum physics (Tutorials, L3)
  • Electrons and phonons in nano-structures (M2 DQ)
  • Wave optics (Tutorials + practicals, L3 EIDD)

Jurys :

  • ENS
  • Agrégation externe de sciences physiques, option physique (2011-2015)