Journal
NANO LETTERS
Volume 11, Issue 6, Pages 2457-2463Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl200901w
Keywords
Active; plasmonic; nanoantenna; hybrid nanostructures; nanophotonics
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Funding
- EPSRC [EP/H019669/1]
- ETORTEK
- Basque Government
- Spanish Ministry of Innovation and Science [FIS2007-66711-001-01]
- EPSRC [EP/H019669/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H019669/1] Funding Source: researchfish
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We demonstrate experimentally picosecond all-optical control of a single plasmonic nanoantenna embedded in indium tin oxide (ITO). We identify a picosecond response of the antenna-ITO hybrid system, which is distinctly different from transient bleaching observed for gold antennas on a nonconducting SiO2 substrate. Our experimental results can be explained by the large free-carrier nonlinearity of ITO, which is enhanced by plasmon-induced hot-electron injection from the gold nanoantenna into the conductive oxide. The combination of tunable antenna-ITO hybrids with nanoscale plasmonic energy transfer mechanisms, as demonstrated here, opens a path for new ultrafast devices to produce nanoplasmonic switching and control.
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