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

    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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