Nonlinear Excitation of Surface Plasmon Polaritons by Four-Wave Mixing
- 1 August 2008
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 101 (5), 056802
- https://doi.org/10.1103/physrevlett.101.056802
Abstract
We demonstrate nonlinear excitation of surface plasmons on a gold film by optical four-wave mixing. Two excitation beams of frequencies omega(1) and omega(2) are used in a modified Kretschmann configuration to induce a nonlinear polarization at a frequency of omega(4wm)=2omega(1)-omega(2), which gives rise to surface plasmon excitation at a frequency of omega(4wm). We observe a characteristic plasmon dip at the Kretschmann angle and explain its origin in terms of destructive interference. Despite a nonvanishing bulk response, surface plasmon excitation by four-wave mixing is dominated by a nonlinear surface polarization. To interpret and validate our results, we provide a comparison with second-harmonic generation.Keywords
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