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Q: Quantenoptik und Photonik
Q 25: Photonische Kristalle II
Q 25.4: Vortrag
Dienstag, 14. März 2006, 14:30–14:45, HI
Nonlinear-optical response of metamaterials: Experimental demonstration of second-harmonic generation — •Matthias W. Klein1, Christian Enkrich1, Martin Wegener1, Jens Förstner2, Jerome V. Moloney2, Walter Hoyer3, Tineke Stroucken3, Torsten Meier3, Stephan W. Koch3, and Stefan Linden4 — 1Institut für Angewandte Physik, Universität Karlsruhe (TH), 76131 Karlsruhe — 2Arizona Center for Mathematical Sciences, University of Arizona, Tucson, AZ 85721, USA — 3Fachbereich Physik und Wissenschaftliches Zentrum für Materialwissenschaften, Universität Marburg, 35032 Marburg — 4Institut für Nanotechnologie, Forschungszentrum Karlsruhe, 76021 Karlsruhe
The fabrication of metamaterials [1] has recently [2,3] reached resonance frequencies in the near-infrared or even visible regime. This development has triggered many experiments in linear optics, however, the nonlinear optics of metamaterials is mostly unexplored so far. We present experiments on second-harmonic generation (SHG) by lithographically defined Split-Ring Resonators (SRRs) arranged in planar 2D arrays with “lattice constants” between 300-630 nm. Using different arrays of SRRs with different resonances tuned to the fixed laser wavelength of 1500 nm, we show that the SHG efficiency strongly depends on the nature of the excited resonance. We find that by far the largest signal arises from exciting the magnetic-dipole resonance.
[1] D. R. Smith et al., Science 305, 788 (2004)
[2] S. Linden et al., Science 306, 1351 (2004)
[3] C. Enkrich et al., Phys. Rev. Lett. 95, 203901 (2005)