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Optical Properties of Small Metal Spheres: Surface Effects



David R. Penn, S Apell


It has been assumed that the optical properties of small spheres can be understood by means of a Drude dielectric function that incorporates a boundary scattering rate 1 / τs~=vF / R, where vF is the Fermi velocity and R is the sphere radius. An effective scattering rate 1 / τs=fvF / R is calculated and f is evaluated as a function of photon frequency. The largest contribution to f is due to the electron density profile of the sphere rather than the boundary scattering that is reduced an order of magnitude by electron screening.
Physical Review Letters


Penn, D. and Apell, S. (1983), Optical Properties of Small Metal Spheres: Surface Effects, Physical Review Letters (Accessed April 19, 2024)
Created April 25, 1983, Updated February 19, 2017