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Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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Combined roughness and electric polarization for the local-field enhancement of the second harmonic response from a silver-electrolyte interface

El Harfouch, Y. and Benichou, E. and Russier-Antoine, I. and Bachelier, G. and Jonin, C. and Berlouis, L.E.A. and Brevet, P.F. (2009) Combined roughness and electric polarization for the local-field enhancement of the second harmonic response from a silver-electrolyte interface. Physical Review B, 79 (11). ISSN 1098-0121

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Abstract

A nanoscale rough silver film is electrodeposited from a silver cyanide aqueous solution and its growth is monitored by second harmonic generation (SHG). For growth by potential step into the diffusion controlled region, a maximum in the SHG intensity is always obtained for an equivalent silver film thickness of ∼60 nm, based on the charge consumed. The SH intensity decreases for thicker but smoother films. A study as a function of an applied static electric field for an already grown film shows that the combination of nanoscale roughness and electric polarization is able to yield large enhancement of SH signal intensities. From a microscopic analysis of the data, it is shown that the nonlinear surface current perpendicular to the interface exhibits a nonlinear dependence with the applied potential, owing to the combination of roughness and electric polarization.