Journal
NANO LETTERS
Volume 15, Issue 2, Pages 1324-1330Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl5045428
Keywords
Plasmonic nanoantenna; Fabry-Perot; cathodoluminescence; dark-field spectroscopy; plasmon; hybridization frequency pulling; antinode drift
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Funding
- Robert A. Welch Foundation [C-1220, C-1222]
- National Security Science and Engineering Faculty Fellowship (NSSEFF) [N00244-09-1-0067]
- National Science Foundation (NSF) [ECCS-1040478]
- ONR [N00014-10-1-0989]
- Cyberinfrastructure for Computational Research - NFS [CNS-0821727]
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In a standing wave optical cavity, the coupling of cavity modes, for example, through a nonlinear medium, results in a rich variety of nonlinear dynamical phenomena, such as frequency pushing and pulling, mode-locking and pulsing, modal instabilities, even complex chaotic behavior. Metallic nanowires of finite length support a hierarchy of longitudinal surface plasmon modes with standing wave properties: the plasmonic analog of a FabryPerot cavity. Here we show that positioning the nanowire within the gap of a plasmonic nanoantenna introduces a passive, hybridization-based coupling of the standing-wave nanowire plasmon modes with the antenna structure, mediating an interaction between the nanowire plasmon modes themselves. Frequency pushing and pulling, and the enhancement and suppression of specific plasmon modes, can be controlled and manipulated by nanoantenna position and shape.
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