Research Group, Thales Research & Technology, Palaiseau, France
High frequency signals are more and more
carried over optical fibers that exhibit electromagnetic immunity, low
propagation losses, very large bandwidth. Optical telecom fibers operate at
1.55 µm and optic to electric conversion is performed with InGaAs semiconductors.
Graphene, thanks to its remarkable energy band structure, operate also at 1.55
µm and can be easily integrated on silicon photonic-electronic platform.
Moreover the very high mobility of charge carriers in graphene should allow
fabricating very high frequency optoelectronic devices.
We have demonstrated high frequency (up to
30 GHz) electro-optic mixers based on graphene. A graphene film obtained by
chemical vapor deposition was transferred on a Si/SiO2 substrate.
Then a graphene based coplanar waveguide was fabricated and generic photomixing
functions were demonstrated. Indeed, coupling an optically carried signal at
frequency f1with an electrical signal at frequency f2 (both f1 and/or f2 up to
30GHz) provides frequency up and down conversion, i.e. generate signals at
frequencies f1+f2 and f1-f2. This device is an essential block for future wide
bandwidth graphene based telecom low cost modules.
Jean-Paul Mazellier is
currently Research Engineer in the Micro & Nano Physics Laborarty from
Physics Research Group of Thales Research & Technology. Thales activity
domain is aerospace, space, ground transportation, defence and security (61.000
employees, present in 56 countries). Jean-Paul Mazellier research domain covers
carbon based nanomaterials from carbon nanotubes for field emission devices,
nanodiamond for chemistry and biology domains, and graphene for high frequency
opto-electronics. He received his B.S. degree in Physics from Pierre and Marie
Curie University (Paris 6, 2006) and an Engineer diploma from Ecole Centrale
Paris (2006). He received a Ph.D. in microelectronics engineering (2009) from
Institut National Polytechnique Grenoble where he studied the electrical and
thermal properties of nanodiamond as well as its integration in advanced
microelectronics devices. He worked as
research engineer in the R&D section of Electricité de France (EDF,
European leader in energy production and providing) studying reliability of
electronics components for nuclear plants control. He joined Thales Research
& Technology by end of year 2011. His awards include a best Ph.D. student
work from Institut National Polytechnique Grenoble (2010).