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Proceedings Paper

Monolithic nanoporous gold disks with large surface area and high-density plasmonic hot-spots
Author(s): Fusheng Zhao; Jianbo Zeng; Md Masud Parvez Arnob; Greggy M. Santos; Wei-Chuan Shih
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Paper Abstract

Plasmonic metal nanostructures have shown great potential in sensing, photovoltaics, imaging and biomedicine, principally due to enhancement of the local electric field by light-excited surface plasmons, the collective oscillation of conduction band electrons. Thin films of nanoporous gold have received a great deal of interest due to the unique 3- dimensional bicontinuous nanostructures with high specific surface area. However, in the form of semi-infinite thin films, nanoporous gold exhibits weak plasmonic extinction and little tunability in the plasmon resonance, because the pore size is much smaller than the wavelength of light. Here we show that by making nanoporous gold in the form of disks of sub-wavelength diameter and sub-100 nm thickness, these limitations can be overcome. Nanoporous gold disks (NPGDs) not only possess large specific surface area but also high-density, internal plasmonic “hot-spots” with impressive electric field enhancement, which greatly promotes plasmon-matter interaction as evidenced by spectral shifts in the surface plasmon resonance. In addition, the plasmonic resonance of NPGD can be easily tuned from 900 to 1850 nm by changing the disk diameter from 300 to 700 nm. The coupling between external and internal nanoarchitecture provides a potential design dimension for plasmonic engineering. The synergy of large specific surface area, high-density hot spots, and tunable plasmonics would profoundly impact applications where plasmonic nanoparticles and non-plasmonic mesoporous nanoparticles are currently employed, e.g., in in-vitro and in-vivo biosensing, molecular imaging, photothermal contrast agents, and molecular cargos.

Paper Details

Date Published: 11 March 2015
PDF: 7 pages
Proc. SPIE 9340, Plasmonics in Biology and Medicine XII, 93400B (11 March 2015); doi: 10.1117/12.2078527
Show Author Affiliations
Fusheng Zhao, Univ. of Houston (United States)
Jianbo Zeng, Univ. of Houston (United States)
Md Masud Parvez Arnob, Univ. of Houston (United States)
Greggy M. Santos, Univ. of Houston (United States)
Wei-Chuan Shih, Univ. of Houston (United States)

Published in SPIE Proceedings Vol. 9340:
Plasmonics in Biology and Medicine XII
Tuan Vo-Dinh; Joseph R. Lakowicz, Editor(s)

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