Surface plasmon field-enhanced light scattering

Fundamentals. Surface plasmons (SP) can be used to monitor optical properties of metal and semiconductor surfaces. For introductory overviews, see [969, 970]. Surface plasmon field-enhanced light scattering (SPFELS) is observed when an interface is illuminated by light under conditions stimulating surface plasmon excitation as reported [971]. 

Fig. 5.155. Cyclic voltammogram of polyaniline and surface plasmon field-enhanced light scattering with a solution of 0.5 M H2SO4, second scan, dE jdt — 20 mV-s based on data in [971]...

SPFELS Surface plasmon field enhanced light scattering... 

Baba, A. Xia, C. Knoll, W. Advincula, R. C., Electrochemical Surface Plasmon Resonance and Field-Enhanced Light-Scattering Monomer Copolymerization... 

Metal nanoparticles have attracted considerable interest due to their properties and applications related to size effects, which can be appropriately studied in the framework of nanophotonics [1]. Metal nanoparticles such as silver, gold and copper can scatter light elastically with remarkable efficiency because of a collective resonance of the conduction electrons in the metal (i.e., the Dipole Plasmon Resonance or Localized Surface Plasmon Resonance). Plasmonics is quickly becoming a dominant science-based technology for the twenty-first century, with enormous potential in the fields of optical computing, novel optical devices, and more recently, biological and medical research [2]. In particular, silver nanoparticles have attracted particular interest due to their applications in fluorescence enhancement [3-5]. 

Raman enhancement by SERS is mainly attributed to an electromagnetic (EM) field enhancement via localized optical fields of the metallic nanostmctures that are related to plasmon resonance excitation. The increase of the cross-section with contact between the metal nanostructure and a molecule induces an additional enhancement. Without enhancement by the electrical resonance between incident light and molecules, the total Stokes-Raman signal P (vs) is proportional to the number of molecules in the scattering volume N, the Raman cross-section without surface enhancement and the excitation laser intensity... 

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