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Mesoscopic Au “Meatball” Particles
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In conclusion, sub-micrometer meatball-like Au particles provide a very interesting mesoscopic regime in which their optical responses are determined by both the mesoscopic size and the particle’s nanoscale surface roughness. Higher-order multipole plasmon modes that would be dominant for smooth Au particles in this size regime are significantly attenuated by nanoscale surface roughness. In contrast to small Au nanoparticles within the dipole limit, the dipole and higher-order multipole plasmon modes of the sub-micrometer Au spheres display increased SPR sensitivities to the dielectric properties of the surrounding medium. The presence of nanoscale surface roughness significantly increases near-field enhancements on the particle surface, giving rise to stable and reproducible SERS enhancements on the order of 106–107 from individual particles. Close-packed arrays formed through the self-assembly of the sub-micrometer meatball-like particles combine the features of nanoscale surface roughness and the nanoscale interparticle junctions, resulting in SERS enhancements as large as ∼ 108. The unique optical properties of these mesoscopic particles and particlearrays hold great potential in chemical sensing and spectroscopic applications. |
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