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Enhancement of bulk-type multipolar second-harmonic generation arising from surface morphology of metals

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Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalNew Journal of Physics
Publication statusPublished - 2010
Publication typeA1 Journal article-refereed


Gold films of 20 and 150 nm nominal thickness were characterized by two-beam second-harmonic generation to address their second-order nonlinear optical responses of surface (dipolar) and bulk (higher multipolar) origin. The surface response is enhanced by ~20% in the case of the 20 nm film, as expected due to its higher surface roughness. Surprisingly, the bulk-type response is enhanced to a greater extent, exceeding 80%, and this can be explained by effective quadrupolar nonlinearity arising from the field interaction with the local nonlinearity of nanoscale surface features.

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Field of science, Statistics Finland

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