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HL: Fachverband Halbleiterphysik

HL 51: Photonic crystals II

HL 51.6: Talk

Friday, March 27, 2009, 11:45–12:00, BEY 154

Nonlinear Optical Spectroscopy of Metamaterials — •Mathieu Gentile¹, Mario Hentschel¹, Hongcang Guo², Harald Giessen², and Manfred Fiebig¹ — ¹Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Germany — ²4. Physikalisches Institut, Universität Stuttgart, Germany

Optical metamaterials recently gained considerable attention since they offer genuinely new optical properties with possible negative value for effective electric permittivity, ε, and magnetic permeability, µ.

We measure the first-ever second harmonic generation (SHG) spectra of ⊔-shaped gold structure arrays on a glass substrate. Using a 130 fs OPA-tunable laser source the spectral response was measured in the SHG range from 1.64 eV to 3.00 eV.

Measurements are in perfect agreement with tensor components allowed by sample symmetry. The linear reflection spectrum of these structures displays a resonance for photon energies around 0.83 eV. In contrast, SHG spectra reveal resonances at different photon energies that are determined by the actual geometry of the metamaterial “atoms” while the linear optical properties of the metamaterial and the spectral characteristics of the gold are of minor significance.