Journal ArticleDOI
Unidirectional Plasmon Propagation in Metallic Nanowires
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In this paper, the authors demonstrate the selective coupling of photons into the plasmon mode of a 20 nm diameter nanowire, which then propagates in a nonemissive fashion down the wire length before being emitted as an elastically scattered photon at distal end.Abstract:
We report the observation of unidirectional plasmon propagation in metallic nanowires over distances >10 μm. Through control of the incident excitation wavelength and rod composition, we demonstrate the selective coupling of photons into the plasmon mode of a 20 nm diameter nanowire. This mode then propagates in a nonemissive fashion down the wire length before being emitted as an elastically scattered photon at the distal end. As expected from previous studies of plasmon excitation in nanoparticles and thin films, we observe a strong wavelength and material dependence of this phenomenon. This metal-dependent plasmon propagation is exploited to produce a wire through which plasmons propagate unidirectionally. A bimetallic wire with a sharp Au/Ag heterojunction is shown to display both wavelength dependence and unidirectionality with respect to plasmon propagation across the heterojunction. It is expected that these results will contribute to the growing interest in optical energy transport in molecular-le...read more
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Plasmonics: Fundamentals and Applications
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References
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Journal ArticleDOI
Extraordinary optical transmission through sub-wavelength hole arrays
Thomas W. Ebbesen,Thomas W. Ebbesen,Henri J. Lezec,H. F. Ghaemi,Tineke Thio,Peter A. Wolff,Peter A. Wolff +6 more
TL;DR: In this article, the optical properties of submicrometre cylindrical cavities in metallic films were explored and it was shown that arrays of such holes display highly unusual zero-order transmission spectra at wavelengths larger than the array period, beyond which no diffraction occurs.
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Surface plasmons enhance optical transmission through subwavelength holes
TL;DR: In this article, it was shown that the minima are the collection of loci for Wood's anomaly, which occurs when a diffracted beam becomes tangent to the film, and that the maxima were the result of a resonant excitation of surface plasmons (SP's).
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Guiding of a one-dimensional optical beam with nanometer diameter
TL;DR: The concept of a one-dimensional optical wave and its waveguides are proposed for what is to the authors' knowledge the first time and the applications of the waveguide to optical devices in the nanometer range are discussed.
Journal ArticleDOI
Squeezing the Optical Near-Field Zone by Plasmon Coupling of Metallic Nanoparticles
Joachim R. Krenn,Alain Dereux,Jean-Claude Weeber,Eric Bourillot,Yvon Lacroute,J. P. Goudonnet,Gerburg Schider,W. Gotschy,Alfred Leitner,Franz R. Aussenegg,Christian Girard +10 more
TL;DR: In this article, the experimental observation of near-field optical effects close to Au nanoparticles using a photon scanning tunneling microscope (PSTM) allowed an unprecedented direct comparison with theoretical computations of the optical near field intensity.
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Local Excitation, Scattering, and Interference of Surface Plasmons.
TL;DR: The optical probe of a scanning near-field optical microscope is shown to act as a point source of surface plasmon (SP) polaritons on gold and silver films, which provide detailed information about SP scattering, reflection, and interference phenomena.