Abstract
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.
| Original language | English |
|---|---|
| Article number | 063009 |
| Journal | New Journal of Physics |
| Volume | 12 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2010 |
| MoE publication type | A1 Journal article-refereed |
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Wang, F. X., Rodriquez, F. J., Albers, W. M., & Kauranen, M. (2010). Enhancement of bulk-type multipolar second-harmonic generation arising from surface morphology of metals. New Journal of Physics, 12(6), [063009]. https://doi.org/10.1088/1367-2630/12/6/063009