Light Fields at the Nanoscale
Professor L.(Kobus) Kuipers
FOM Institute AMOLF, Amsterdam, The Netherlands
2:30 pm Monday, 30 January 2012, EN101 Lecture Theatre (EN Building), Hawthorn.
Manipulating light at the nanoscale forms the central theme of nanophotonics. Metal nanostructures can exert a huge control over light at the nanoscale. We have succeeded to efficiently trap light on gold nanowires as thin as 40 nm by exciting a Sommerfeld-like plasmon mode . Using a phasesensitive,
polarization-sensitive near-field microscope we are able to nail down the symmetry of the mode and characterize its propagation losses . Interestingly, the near-field probe used is also a metallic nanostructure. We have used its cylindrical symmetry to induce a light-matter interaction mediated by the magnetic field rather than by the electric field, which usually dominates light-matter interaction at optical frequencies. The circular current induced by the magnetic field impinging on the metallic ring in effect results in a “diamagnetic” light matter interaction which allowed the tuning of the resonance frequency of a photonic crystal nanocavity . Through a slight modification of the symmetry of the near-field probe, we were able to visualize the magnetic field in a photonic waveguide for the first time . Coherent control of surface plasmon excitation enables the creation of plasmonic “hot spots” at arbitrary positions .
1. E. Verhagen, M. Spasenović, A. Polman and, L. Kuipers, Phys. Rev. Lett. 102, 203904 (2009).
2. D.J. Dikken, M. Spasenović, E. Verhagen, D. van Oosten and L. Kuipers, Opt. Express 18, 16112-16119 (2010)
3. M. Burresi, T. Kampfrath, D. van Oosten, J.C. Prangsma, B.-S. Song, S. Noda and L. Kuipers, Phys. Rev. Lett.
105, 123901 (2010).
4. M. Burresi, D. van Oosten, T. Kampfrath, H. Schoenmaker, R. Heideman, A. Leinse and L. Kuipers, Science 326,
5. B. Gjonaj, J. Aulbach, P.M. Johnson, A.P. Mosk, L. Kuipers and A. Lagendijk, Nature Photon. 5, 360-363 (2011).
Back to 2012 programme