Near-Field Dynamics of Optical Yagi-Uda Nanoantennas

We present near-field measurements of optical Yagi-Uda nanoantennas that are used in receiving mode. The eigenmode imaging of amplitude and phase by apertureless scanning near-field optical microscopy allows us to investigate the dynamics of the local out-of-plane electric field components and to vi...

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Bibliographic Details
Published in:Nano letters 2011-07, Vol.11 (7), p.2819-2824
Main Authors: Dorfmüller, Jens, Dregely, Daniel, Esslinger, Moritz, Khunsin, Worawut, Vogelgesang, Ralf, Kern, Klaus, Giessen, Harald
Format: Article
Language:English
Subjects:
Antennas
Applied sciences
Dynamic tests
Dynamics
Electronics
Evolution
Exact sciences and technology
Illumination
Microscopy, Electron, Scanning
Molecular electronics, nanoelectronics
Nanostructure
Nanostructures - chemistry
Nanotechnology
Particle Size
Receiving
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Simulation
Surface Properties
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Summary:We present near-field measurements of optical Yagi-Uda nanoantennas that are used in receiving mode. The eigenmode imaging of amplitude and phase by apertureless scanning near-field optical microscopy allows us to investigate the dynamics of the local out-of-plane electric field components and to visualize the temporal evolution of this time-harmonic reception process. The antenna directionality manifests itself by the dependence of the local field enhancement at the feed element on the illumination direction. Simulations taking into account the substrate confirm our observation of the directionality. Our work demonstrates the possibility to characterize multielement nanoantennas by electromagnetic antenna near-field scanners.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl201184n