Abstract：
:Mapping near-field profiles and dynamics of surface plasmon polaritons is crucial for understanding their fundamental optical properties and designing miniaturized photonic devices. This requires a spatial resolution on the sub-wavelength scale because the effective polariton wavelength is shorter than free-space excitation wavelengths. Here by combining total internal reflection excitation with surface-enhanced Raman scattering imaging, we mapped at the sub-wavelength scale the spatial distribution of the dominant perpendicular component of surface plasmon fields in a metal nanoparticle-film system through spectrally selective and polarization-resolved excitation of the vertical gap mode. The lateral field-extension at the junction, which is determined by the gap-mode volume, is small enough to distinguish a spot size ~0.355λ0 generated by a focused radially polarized beam with high reproducibility. The same excitation and imaging schemes are also used to trace near-field nano-focusing and interferences of surface plasmon polaritons created by a variety of plasmon lenses.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Du L,Lei DY,Yuan G,Fang H,Zhang X,Wang Q,Tang D,Min C,Maier SA,Yuan Xdoi
10.1038/srep03064subject
Has Abstractpub_date
2013-10-29 00:00:00pages
3064issn
2045-2322pii
srep03064journal_volume
3pub_type
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