Title

Effect of surface roughness on substrate-tuned gold nanoparticle gap plasmon resonances

Authors

Authors

C. Lumdee; B. F. Yun;P. G. Kik

Comments

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Abbreviated Journal Title

Nanoscale

Keywords

SILVER NANOPARTICLES; RAMAN-SCATTERING; ENHANCEMENT; EXCITATION; ANTENNAS; MIRROR; MODES; OXIDE; SHAPE; SIZE; Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials; Science, Multidisciplinary; Physics, Applied

Abstract

The effect of nanoscale surface roughness on the gap plasmon resonance of gold nanoparticles on thermally evaporated gold films is investigated experimentally and numerically. Single-particle scattering spectra obtained from 80 nm diameter gold particles on a gold film show significant particle-to-particle variation of the peak scattering wavelength of +/- 28 nm. The experimental results are compared with numerical simulations of gold nanoparticles positioned on representative rough gold surfaces, modeled based on atomic force microscopy measurements. The predicted spectral variation and average resonance wavelength show good agreement with the measured data. The study shows that nanometer scale surface roughness can significantly affect the performance of gap plasmon-based devices.

Journal Title

Nanoscale

Volume

7

Issue/Number

9

Publication Date

1-1-2015

Document Type

Article

Language

English

First Page

4250

Last Page

4255

WOS Identifier

WOS:000350143700052

ISSN

2040-3364

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