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Q: Fachverband Quantenoptik und Photonik

Q 16: Photonik I

Q 16.1: Talk

Tuesday, March 11, 2008, 14:00–14:15, 2B/C

Nonlinear optical response of metal nanoantennas — •Barbara Wild, Jörg Merlein, Tobias Hanke, Alfred Leitenstorfer, and Rudolf Bratschitsch — Departement of Physics and Center for Applied Photonics, University of Konstanz, D-78464 Konstanz, Germany

We have investigated the nonlinear optical response of bowtie-shaped gold nanoantennas fabricated with the colloidal mask technique. The structures were excited by picosecond light pulses with a center wavelength of 790 nm. The excitation frequency is equal to the plasmon resonance of the nanoantennas, which has been determined via darkfield scattering spectroscopy. The spectrum emitted by the nanoantennas consists of a broadband continuum overlapped with a narrowband second harmonic signal at λ = 395 nm. We will discuss the influence of the exciting laser spectrum on the nonlinear response of the metal nanoantennas and possible applications of this effect.