Tuning Localized Transverse Surface Plasmon Resonance in Electricity-Selected Single-Wall Carbon Nanotubes by Electrochemical Doping

Author(s)
Toru Igarashi, Hideki Kawai, Kazuhiro Yanagi, Nguyen Thanh Cuong, Susumu Okada, Thomas Pichler
Abstract

Localized surface-plasmon resonance affects the optical absorption and scattering of nanosized materials. The intensities and peak energies of the surface plasmons strongly depend on the carrier density; thus, the optical absorption peaks originating from the surface-plasmon resonance can be manipulated by the density of injected carriers. In single-wall carbon nanotubes (SWCNTs), the correct identification of surface-plasmon resonance modes is of great interest due to their emerging plasmonic and optoelectronic applications. Here, we demonstrate that high-carrier injection by electric double layers can induce a transverse surface-plasmon peak in aggregated, electricity-selected SWCNTs. In contrast to the well-discussed surface-plasmon resonance mode, whose polarization is parallel to the axis and whose resonance frequency is located in the THz region, our identified mode, which was normal to the axis, was located in the near-infrared range. In addition, our mode's peak position and intensities were tunable by carrier injections, indicating a route to control plasmonic optical processes by electric double-layer carrier injections using ionic liquid.

Organisation(s)
Electronic Properties of Materials
Journal
Physical Review Letters
Volume
114
No. of pages
5
ISSN
0031-9007
DOI
https://doi.org/10.1103/PhysRevLett.114.176807
Publication date
05-2015
Publication status
Published
Peer reviewed
Yes
Austrian Fields of Science 2012
103018 Materials physics
Keywords
ELECTRONIC-STRUCTURE, TERAHERTZ CONDUCTIVITY, FILMS
Portal url
https://ucris.univie.ac.at/portal/en/publications/tuning-localized-transverse-surface-plasmon-resonance-in-electricityselected-singlewall-carbon-nanotubes-by-electrochemical-doping(3c42fc0b-1b53-4398-823b-bb0e3077332d).html