[institut] SCL Seminar: Jorge Pedros, Friday, 21 October, 14:00

[Nenad Vukmirovic]

Dear colleagues,

You are cordially invited to the SCL seminar which will be held on 
Friday, 21 October 2016 at 14:00 in “Dr. Dragan Popović” library reading 
room of the Institute of Physics Belgrade. The talk entitled


  Active plasmonics in graphene using surface acoustic waves

will be given by Prof. Jorge Pedrós (Institute of Optoelectronic Systems 
and Microtechnology, Universidad Politécnica de Madrid, Spain). Abstract 
of the talk:

In comparison to conventional plasmonics, the tunability of graphene 
plasmons offers unique possibilities for applications in metamaterials, 
quantum optics control, biosensing, and light harvesting. However, most 
of the techniques developed so far for coupling light into graphene 
plasmons do not offer active control of the coupling mechanism. We have 
recently demonstrated a method to couple far-field radiation into 
propagating graphene plasmons by periodically deforming a continuous 
graphene sheet with an electrically generated surface acoustic wave 
(SAW) [1]. This mechanism allows to create a tunable optical grating 
without the need of any patterning in either the graphene layer or the 
substrate, thus eliminating edge scattering and fragility issues. An 
interdigital transducer (IDT) on a piezoelectric film is used to launch 
the SAW across the graphene sheet. By diffraction at the grating, 
incident laser light can overcome the momentum mismatch and excite 
propagating plasmons in the graphene sheet. This approach permits to 
efficiently control the graphene plasmons both temporally and spatially. 
Thus, the propagating plasmons can be switched electrically via the 
high-frequency signal at the IDT and the generated plasmon wavefronts 
can be shaped by tailoring the IDT design.  Moreover, the IDT technology 
ensures the easy fabrication of graphene plasmonic devices by the 
microelectronics industry.

In this talk, we will briefly review the different methods used so far 
for the generation of graphene plasmons, before presenting the details 
of our novel SAW-assisted approach. We will present the hybridized 
graphene plasmon-phonon dispersion in the graphene/piezoelectric 
structures, as well as the design and fabrication technology of the 
plasmonic devices, including the transfer of graphene [2] to various 
piezoelectric materials. We will finally discuss different SAW-mediated 
plasmon functionalities based on several engineered device geometries.

Acknowledgements: Financial support from the EU Erasmus+ Programme, EU 
project SAWTrain (H2020-MSCA-ITN-2014-642688), and Spanish MINECO 
project GRAFAGEN (ENE2013-47904-C3-1-R).

[1] J. Schiefele, J. Pedrós, F. Sols, F. Calle, and F. Guinea, Phys. 
Rev. Lett. 111, 237405 (2013).
[2] A. Boscá, J. Pedrós, J. Martínez, T. Palacios, and F. Calle, Sci. 
Rep. 6, 21676 (2016).

Best regards,

-- 
Dr Nenad Vukmirovic,
Research Professor,
Scientific Computing Laboratory,
Institute of Physics Belgrade,
Serbia.
URL: http://www.scl.rs/nenad

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