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Proceedings Paper

New plasmonic materials in visible spectrum through electrical charging
Author(s): Jiangrong Cao; Rajesh Balachandran; Manish Keswani; Krishna Muralidharan; Slimane Laref; Richard Ziolkowski; Keith Runge; Pierre Deymier; Srini Raghavan; Mamoru Miyawaki
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Paper Abstract

Due to their negative permittivity, plasmonic materials have found increasing number of applications in advanced photonic devices and metamaterials, ranging from visible wavelength through microwave spectrum. In terms of intrinsic loss and permittivity dispersion, however, limitations on available plasmonic materials remain a serious bottleneck preventing practical applications of a few novel nano-photonic device and metamaterial concepts in visible and nearinfrared spectra. To overcome this obstacle, efforts have been made and reported in literature to engineer new plasmonic materials exploring metal alloys, superconductors, graphene, and heavily doped oxide semiconductors. Though promising progress in heavily doped oxide semiconductors was shown in the near-infrared spectrum, there is still no clear path to engineer new plasmonic materials in the visible spectrum that can outperform existing choices noble metals, e.g. gold and silver, due to extremely high free electron density required for high frequency plasma response. This study demonstrates a path to engineer new plasmonic materials in the visible spectrum by significantly altering the electronic properties in existing noble metals through high density charging/discharging and its associated strong local bias effects. A density functional theory model revealed that the optical properties of thin gold films (up to 7 nm thick) can be altered significantly in the visible, in terms of both plasma frequency (up to 12%) and optical permittivity (more than 50%). These corresponding effects were observed in our experiments on surface plasmon resonance of a gold film electrically charged via a high density double layer capacitor induced by a chemically non-reacting electrolyte.

Paper Details

Date Published: 21 February 2013
PDF: 7 pages
Proc. SPIE 8632, Photonic and Phononic Properties of Engineered Nanostructures III, 86321I (21 February 2013); doi: 10.1117/12.2002883
Show Author Affiliations
Jiangrong Cao, Canon U.S.A., Inc. (United States)
Rajesh Balachandran, The Univ. of Arizona (United States)
Manish Keswani, The Univ. of Arizona (United States)
Krishna Muralidharan, The Univ. of Arizona (United States)
Slimane Laref, The Univ. of Arizona (United States)
Richard Ziolkowski, The Univ. of Arizona (United States)
Keith Runge, The Univ. of Arizona (United States)
Pierre Deymier, The Univ. of Arizona (United States)
Srini Raghavan, The Univ. of Arizona (United States)
Mamoru Miyawaki, Canon U.S.A., Inc. (United States)


Published in SPIE Proceedings Vol. 8632:
Photonic and Phononic Properties of Engineered Nanostructures III
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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