Abstract
We will report second harmonic generation (SHG) in nonlinear optical (NLO) polymers excited by surface plasmon enhanced optical fields. The surface plasmon (SP) polariton was excited in an attenuated total reflection geometry having the Kretchmann configuration. The NLO polymers, consisting of Disperse Red1 as guest chromophores and poly (methyl methacrylate) as host materials, were coated upon the Ag layers. Our experimental results indicated that the SHG signal intensity from the polymer coated Ag films was more than 10 times higher than that from the non-coated Ag films. The SHG autocorrelation traces excited by SP-enhanced fields were also studied and the correlation time was shorter than 150 fs, the temporal resolutions of the present spectrometer.
Highlights
Great attentions have been paid for Surface Plasmon (SP) and its applications to nanophotonics in the field of ultrafast optics
We will report second harmonic generation (SHG) in nonlinear optical (NLO) polymers excited by surface plasmon enhanced optical fields
We examined second-order nonlinear susceptibility in NLO polymers pumped by surface plasmon (SP)-enhanced optical fields and its ultrafast response
Summary
Great attentions have been paid for Surface Plasmon (SP) and its applications to nanophotonics in the field of ultrafast optics. Not so much attentions seems to be paid to the SP-enhanced fields from the viewpoint of the excitation light sources for the second-order NLO, the lowest order NLO phenomena, even though a lot of studies have dealt with the second-order NLO susceptibilities of the metal surface itself where the SP was created. It was partly because of the difficulties in preparing NLO active materials with noncentrosymmetric structures on the metal surface.
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