期刊
SMALL
卷 10, 期 10, 页码 1959-1966出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201302926
关键词
optical magnetic field; near-field imaging; surface plasmon resonance; nanoantenna interactions; field superposition
类别
资金
- Flemish Government
- MP1201 COST Action
- F.W.O. (Flanders)
- Mandat d'Impulsion Scientifique of the F.R.S.-FNRS
The design of many promising, newly emerging classes of photonic metamaterials and subwavelength confinement structures requires detailed knowledge and understanding of the electromagnetic near-field interactions between their building blocks. While the electric field distributions and, respectively, the electric interactions of different nanostructures can be routinely measured, for example, by scattering near-field microscopy, only recently experimental methods for imaging the magnetic field distributions became available. In this paper, we provide direct experimental maps of the lateral magnetic near-field distributions of variously shaped plasmonic nanoantennas by using hollow-pyramid aperture scanning near-field optical microscopy (SNOM). We study both simple plasmonic nanoresonators, such as bars, disks, rings and more complex antennas. For the studied structures, the magnetic near-field distributions of the complex resonators have been found to be a superposition of the magnetic near-fields of the individual constituting elements. These experimental results, explained and validated by numerical simulations, open new possibilities for engineering and characterization of complex plasmonic antennas with increased functionality.
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