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Optical properties of nanosized gold particles

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Abstract

Gold particles smaller than 2 nm in diameter were grown in glass. Their optical absorption spectrum did not show the usual plasma absorption band for gold particles; this band was spread by the small particle size. The absorption spectrum was calculated from the bulk optical properties of gold, modified for the small particle size; there was good agreement between calculated and measured spectra. The smallest particles containing from 20 to 40 gold atoms showed a λ-4 dependence of absorption on wavelength l. This result implies that the absorption in these particles was entirely from free electrons at wavelengths above 0.3 μm.

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Authors and Affiliations

  1. Materials Engineering Department, Rensselaer Polytechnic Institute, Troy, New York, 12180-3590, United States

    Robert H. Doremus & Pratima Rao

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  1. Robert H. Doremus
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  2. Pratima Rao
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Doremus, R.H., Rao, P. Optical properties of nanosized gold particles. Journal of Materials Research 11, 2834–2840 (1996). https://doi.org/10.1557/JMR.1996.0358

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