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URN:
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http://URN.fi/URN:NBN:fi:tty-201103311105
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Title:
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Enhancement of bulk-type multipolar second-harmonic generation arising from surface morphology of metals |
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Author:
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Wang, Fu Xiang; Rodriguez, Francisco J.; Albers, Willem M.; Kauranen, Martti |
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Publication type:
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Artikkeli - Article |
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Issue date:
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2010 |
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DOI:
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http://dx.doi.org/10.1088/1367-2630/12/6/063009
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Description:
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Creative Commons Attribution-NonCommercial-ShareAlike http://creativecommons.org/licenses/by-nc-sa/3.0/ |
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University:
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Tampereen teknillinen yliopisto |
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Faculty:
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Luonnontieteiden ja ympäristötekniikan tiedekunta - Faculty of Science and Environmental Engineering |
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Department:
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Fysiikan laitos - Department of Physics |
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Abstract:
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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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Copyright:
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This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. |