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

Fu Xiang Wang; Francisco J. Rodriquez; Willem M. Albers; Martti Kauranen

doi:10.1088/1367-2630/12/6/063009

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

Fu Xiang Wang, Francisco J. Rodriquez, Willem M. Albers, Martti Kauranen

VTT Technical Research Centre of Finland

Research output: Contribution to journal › Article › Scientific › peer-review

15 Citations (Scopus)

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	https://doi.org/10.1088/1367-2630/12/6/063009
Publication status	Published - 2010
MoE publication type	A1 Journal article-refereed

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title = "Enhancement of bulk-type multipolar second-harmonic generation arising from surface morphology of metals",

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.",

author = "Wang, {Fu Xiang} and Rodriquez, {Francisco J.} and Albers, {Willem M.} and Martti Kauranen",

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AU - Rodriquez, Francisco J.

AU - Albers, Willem M.

AU - Kauranen, Martti

PY - 2010

Y1 - 2010

N2 - 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.

AB - 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.

U2 - 10.1088/1367-2630/12/6/063009

DO - 10.1088/1367-2630/12/6/063009

M3 - Article

VL - 12

JO - New Journal of Physics

JF - New Journal of Physics

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