Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 40: Focussed session: Coherence and coherent control in nanophotonics and plasmonics I

O 40.1: Topical Talk

Mittwoch, 28. März 2012, 10:30–11:00, MA 005

Active control of light propagation in nanophotonic structures — •Kobus Kuipers — FOM Institute AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands

With recent advances in nanofabrication it has become possible to control the flow and/or concentration of light at the nanoscale with proper combinations of geometry and materials. This has led to the unprecedented concentration of light in hot spots of only a fraction of a wavelength cubed and the controlled propagation of light at group velocities several orders of magnitude smaller than c. However, in the majority of cases the control over the light is "static", i.e., for a given choice of geometry and materials, the resulting light control is what it is. This lecture will present our latest progress in gaining active control of light fields at the nanoscale. For example, by using amplitude and phase control obtained through spatial light modulators we are able to position plasmonic "hot spots" at arbitrary positions in a "plasmonic arena". Active control of the photonic bandstructure allows changing the "color" of slow light, control over its group velocity and spectral compression. Through a combination of active control and fixed geometry we are able to achieve an "indirect" transition between photonic eigenstates that can be expoited to control the timing of individual ultrashort pulses originally separated in time by mere picoseconds.