Journal
ACS NANO
Volume 5, Issue 11, Pages 9161-9170Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn203406f
Keywords
infrared plasmonics; degenerate semiconductors; transparent conducting oxide; nanorod; sensing; field enhancement
Categories
Funding
- NSF-MRSEC [DMR-0520513]
- ANSER Center [DOE-DE-SC0001059]
- NSF [IGERT-DGE-0801685]
- NSF-NSEC
- Keck Foundation
- State of Illinois
- Northwestern University
- Northwestern University Information Technology (NUIT) unit [p20194]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1121262] Funding Source: National Science Foundation
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This article reports the study of infrared plasmonics with both random and periodic arrays of Indium tin-oxide (ITO) nanorods (NR). A description is given on the synthesis, patterning, and characterization of physical properties of the ITO NR arrays. A classical scattering model, along with a 34) finite-element-method and a 3-D finite-difference-time-domain numerical simulation method has been used to interpret the unique light scattering phenomena. It is also shown that the intrinsic plasma frequency can be varied through careful postsynthesis processing of the ITO NRs. Examples are given on how coupled plasmon resonances can be tuned through patterning of the ITO NR arrays. In addition, environment dielectric sensing has been demonstrated through the shift of the resonances as a result of index change surrounding the NRs. These initial results suggest potential for further Improvement and opportunities to develop a good understanding of infrared plasmonics using ITO and other transparent conducting oxide semiconducting materials.
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