Regensburg 2010 – scientific programme

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DS: Fachverband Dünne Schichten

DS 27: [O] Plasmonics and Nanooptics III (Joint Session DS/O/HL)

DS 27.2: Talk

Wednesday, March 24, 2010, 10:45–11:00, H32

Few-cycle nonlinear optics of single plasmonic nanoantennae — •Tobias Hanke, Günther Krauss, Daniel Träutlein, Barbara Wild, Rudolf Bratschitsch, and Alfred Leitenstorfer — Department of Physics and Center for Applied Photonics, University of Konstanz, D-78457 Konstanz, Germany

We have studied the nonlinear optical properties of single gold nanoantennae driven with few-cycle laser pulses in the near infrared [1]. Intense third harmonic emission is obtained when exciting with fundamental spectra below 1.1 eV. At higher photon energies frequency doubling and two-photon induced luminescence are observed. We relate these findings to the band structure of bulk gold, especially a two-photon resonance with the d-band transitions.

The intense third-harmonic emission enables precise detection of frequency-resolved interferometric autocorrelation traces of individual nanoantennae. We find an enhancement up to 3 orders of magnitude when driving on resonance with the fundamental plasmon mode. A sub-cycle dephasing time as short as 2 fs is measured directly in the time domain, highlighting the strong radiation coupling and ultrabroadband response of these efficient nanodevices.

[1] Hanke et al., Phys. Rev. Lett., accepted for publication.