PDFCreator, Job 2

LABORATOIRE
DE PHOTONIQUE ET
DE NANOSTRUCTURES
Séminaire régulier
Mercredi 11 Janvier 2006 à 11h
Salle des séminaires Richard Planel, bâtiment D1
A real-space, real-time investigation of slow light in
photonics crystals and guided surface plasmons
L. (Kobus) Kuipers
NanoOptics Group , Center for Nanophotonics , FOM Institute for Atomic and Molecular Physics
(AMOLF) Amsterdam , The Netherlands
Manipulating light at a subwavelength lengthscale is the main aim of the rapidly
growing research field of Nanophotonics. Photonic and plasmonic crystal structures are
powerful concepts for gaining optical control. An exciting topic nanophotonic light
manipulation will be presented: slow light. Local time-resolved measurements of slow light
and slow guided surface plasmons will be presented.
Phase-sensitive and time-resolved near-field optical measurements of ultrafast pulse
propagation [1] through line defects in photonic crystals yield information unobtainable by
conventional “black box”-measurements. Not only do we unambiguously obtain the group
velocities of the pulses, but we also detect all the different spatial frequencies of the light
inside the structure. By measuring the excited spatial frequencies (wavevectors) for different
light frequencies (energy), we are able to reconstruct the photonic band diagram of the
structure. We are able to map several Brillouin zones. [2] In the measured band diagrams we
identified the crossing of a very flat band with a waveguide mode band. Local time-resolved
measurements at the correct frequency revealed that the crossing leads to a localised and
stationary light field. An upper bound for its velocity would be c/1000 [3].
Recently, we have been able to observe a significant slow down of guided surface
plasmon polaritons [4].
[1] M.L.M. Balistreri, H. Gersen, et al., Science 294 (5544), 1080 (2001).
[2] H. Gersen, et al., Phys. Rev. Lett. 94, 123901 (2005).
[3] H. Gersen, et al., Phys. Rev. Lett. 94, 073903 (2005).
[4] M. Sandtke, et al., unpublished
Contact: Anne Talneau Tel : 01-6963-6146 Email: [email protected]
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