Topics in Particle and Dispersion Science

Plasmon resonance tuning: Nanoparticle size

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Plasmon resonances of metallic particles can be tuned in several ways. One method is to change the particle size. A plot of the attenuation efficiency, Q_c vs. wavelength of radiation, called the attenuation (extinction) spectrum, will show a sharp peak at the plasmon resonance. As the particle size increases, the peak will broaden and shift to longer wavelengths (for example, Lazarides AA and Schatz 2000, Rayford CE II et al 2005). Qualitatively, this occurs because as the particle size increases, higher order terms from the Mie solution contribute to the extinction. The change in the attenuation of light by the particles with the wavelength of light is a consequence of the change in refractive index with the wavelength. Scaffardi et al 2005 have exploited this property to develop a method for sizing metal nanoparticles.

See plasmon resonance tuning by changing the medium surrounding the particle(s), particle shape/structure/orientation, and other factors. See also plasmon resonance for additional references.

CITATION: Swanson N. L. 2008. Plasmon resonance tuning: Particle size (www.tpdsci.com/Tpc/PlasmResNptTunPtSz.php). In: Top. Part. Disp. Sci. (www.tpdsci.com).

HISTORY: Published: 25-Oct-2008 Modified: 19-Jun-2009 Peer-reviewed: PENDING

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