New plasmonic materials in visible spectrum through electrical charging

Jiangrong Cao, Rajesh Balachandran, Manish Keswani, Krishna Muralidharan, Slimane Laref, Richard Ziolkowski, Keith Runge, Pierre Deymier, Srini Raghavan, Mamoru Miyawaki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

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.

Original languageEnglish (US)
Title of host publicationPhotonic and Phononic Properties of Engineered Nanostructures III
DOIs
StatePublished - 2013
EventPhotonic and Phononic Properties of Engineered Nanostructures III - San Francisco, CA, United States
Duration: Feb 3 2013Feb 7 2013

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8632
ISSN (Print)0277-786X

Other

OtherPhotonic and Phononic Properties of Engineered Nanostructures III
CountryUnited States
CitySan Francisco, CA
Period2/3/132/7/13

Keywords

  • Electrochemistry double layer capacity
  • Optical permittivity
  • Plasmonic metal

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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