Electrooptic Properties of Submonolayer Polydiacetylene Nanoparticle Film Probed by Surface Plasmon Resonance Spectroscopy

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Electrooptic (EO) properties were studied for a polydiacetylene (PDA) nanoparticle (NP) submonolayer film on a thin gold film at a surface coverage of \sigma \sim 0.084, using the attenuated total reflection geometry at the surface plasmon resonance condition. Both linear and second-order EO effects (Pockels and Kerr effects) were observed from the PDA NP submonolayer, although the Pockels effect will be absent in the PDA NP film under the electric dipole approximation. The second- and third-order nonlinear susceptibilities of the PDA NPs are determined to be \chi^{(2)} \sim 10^{2} pm/V and \chi^{(3)} \sim 10^{-9} esu, respectively. The susceptibilities are almost compatible with those in general nonlinear optical materials. The origin of the Pockels effect in the PDA NP film is also discussed.
2012-03-25