Observation of intrinsic size effects in the optical response of individual gold nanoparticles.
basic_science · Level V
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Abstract
The photothermal heterodyne imaging method is used to study for the first time the absorption spectra of individual gold nanoparticles with diameters down to 5 nm. Intrinsic size effects that result in a broadening of the surface plasmon resonance are unambiguously observed. Dispersions in the peak energies and homogeneous widths of the single-particle resonances are revealed. The experimental results are analyzed within the frame of Mie theory.
Medical subject headings
- Gold
- Nanotubes
- Surface Plasmon Resonance