Abstract
We calculate the nonlinear optical properties of small metallic spheres using electromagnetic theory and assuming that the local response of the conduction electrons is the same as for a plane surface. Electromagnetic Mie-resonances cause a strong increase of the second and higher harmonics in the reflected light. Detailed results are given for the second and third harmonic generation, its dependence on the frequency and polarization of the incident light, and on the cluster size. An enhancement of the second harmonic generation by a factor of about 5000 is obtained for small spherical metallic clusters. This is in good agreement with experiments on artificially roughened metal surfaces.
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Östling, D., Stampfli, P. & Bennemann, K.H. Theory of nonlinear optical properties of small metallic spheres. Z Phys D - Atoms, Molecules and Clusters 28, 169–175 (1993). https://doi.org/10.1007/BF01436985
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DOI: https://doi.org/10.1007/BF01436985