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VOLUME 75 (2002) | ISSUE 9 | PAGE 551
Time resolved nonlinear surface plasmon optics
PACS: 42.65.Ky, 73.20.Mf, 42.79.Dj
Abstract
A new surface-sensitive method of time-resolved optical studies is proposed. The method consists in the independent excitation of several surface electromagnetic waves (SEW) by two laser femtosecond pulse beams with varied time delay Δτ and distance Δ r between corresponding excitation regions on surface. To fulfill phase matching condition for plasmon-photon coupling metal grating is used. Due to nonlinear plasmon interaction, the optical radiation with ω1+ω2 and 2ω1-ω2 (where ω1, ω2  are correspondent laser beam frequency) is generated. The intensity of this nonlinear response versus Δτ and Δ r are studied. The direct measurements of the SEW temporal properties are presented. Experiments of this type are important for the development of the femtosecond surface plasmon optics.