Gap-Plasmon Enhanced Gold Nanoparticle Photoluminescence

    Authors

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

    Comments

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    Abbreviated Journal Title

    ACS Photonics

    Keywords

    gap plasmon; gap mode; plasmon resonance; gold nanoparticle; gold; photoluminescence; photoluminescence enhancement; NOBLE-METALS; QUANTUM YIELD; NANORODS; LUMINESCENCE; EMISSION; ANTENNAS; NANOSTRUCTURES; SPECTROSCOPY; SURFACES; MIRROR; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Optics; Physics, Applied; Physics, Condensed Matter

    Abstract

    Gap-plasmon-enhanced gold nanoparticle photoluminescence is studied experimentally at the single-particle level. The photoluminescence spectra of gold nanoparticles on an Al2O3-coated gold film under both 532 and 633 run excitation show a clear peak near the measured gap-plasmon resonance wavelength. Comparing the collected emission spectrum with that from a gold reference film under 633 nm excitation, a peak photoluminescence enhancement factor of 28 000 is observed. The spectral shape and absolute magnitude of the enhancement factors for both excitation wavelengths are reproduced using numerical calculations without the use of any free parameters. The photoluminescence enhancement is explained in terms of a gap-mode-enhanced e h pair generation rate and a wavelength-dependent enhancement of the emission efficiency.

    Journal Title

    Acs Photonics

    Volume

    1

    Issue/Number

    11

    Publication Date

    1-1-2014

    Document Type

    Article

    Language

    English

    First Page

    1224

    Last Page

    1230

    WOS Identifier

    WOS:000345542400019

    ISSN

    2330-4022

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