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2 September 2009 Observation of plasmon resonance linewidth narrowing in embedded gold nanoparticle arrays
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We demonstrate enhanced diffractive coupling resulting in sharpened extinction resonances in periodic arrays of metal nanoparticles embedded effectively below the substrate surface. Strongly enhanced near fields with large spatial overlap with the substrate material are shown to be associated with these extinction features. In particle arrays fabricated on substrates there is a phase velocity mismatch between light propagating above and below the substrate surface, which hinders diffractive coupling and access to such narrow resonances. In contrast, the embedding of the particle arrays beneath the substrate surface, achieved via an etching procedure, offers a more homogeneous dielectric background which improves the diffractive coupling, resulting in the sharp features associated with strong near field enhancements.
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Ronen Adato, Ahmet A. Yanik, and Hatice Altug "Observation of plasmon resonance linewidth narrowing in embedded gold nanoparticle arrays", Proc. SPIE 7394, Plasmonics: Metallic Nanostructures and Their Optical Properties VII, 73941X (2 September 2009);

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