Real-Space Mapping of Fano Interference in Plasmonic Metamolecules

An unprecedented control of the spectral response of plasmonic nanoantennas has recently been achieved by designing structures that exhibit Fano resonances. This new insight is paving the way for a variety of applications, such as biochemical sensing and surface-enhanced Raman spectroscopy. Here we...

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Bibliographic Details
Published in:Nano letters 2011-09, Vol.11 (9), p.3922-3926
Main Authors: Alonso-Gonzalez, Pablo, Schnell, Martin, Sarriugarte, Paulo, Sobhani, Heidar, Wu, Chihhui, Arju, Nihal, Khanikaev, Alexander, Golmar, Federico, Albella, Pablo, Arzubiaga, Libe, Casanova, Felix, Hueso, Luis E, Nordlander, Peter, Shvets, Gennady, Hillenbrand, Rainer
Format: Article
Language:English
Subjects:
Applied sciences
Biochemistry
Biosensing Techniques
Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronics
Exact sciences and technology
Illumination
Infrared
Interference
Interferometry - methods
Materials Testing
Microscopy - methods
Molecular electronics, nanoelectronics
Nanostructure
Nanotechnology - methods
Optics and Photonics
Paving
Physics
Plasmonics
Raman spectroscopy
Scattering, Radiation
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Spectrum Analysis, Raman - methods
Surface and interface electron states
Surface Properties
Wavelengths
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Summary:An unprecedented control of the spectral response of plasmonic nanoantennas has recently been achieved by designing structures that exhibit Fano resonances. This new insight is paving the way for a variety of applications, such as biochemical sensing and surface-enhanced Raman spectroscopy. Here we use scattering-type near-field optical microscopy to map the spatial field distribution of Fano modes in infrared plasmonic systems. We observe in real space the interference of narrow (dark) and broad (bright) plasmonic resonances, yielding intensity and phase toggling between different portions of the plasmonic metamolecules when either their geometric sizes or the illumination wavelength is varied.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl2021366