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Sökning: L773:1094 4087 > Örebro universitet

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1.
  • Miljkovic, Vladimir D., et al. (författare)
  • Mode-specific directional emission from hybridized particle-on-a-film plasmons
  • 2011
  • Ingår i: Optics Express. - 1094-4087. ; 19:14, s. 12856-12864
  • Tidskriftsartikel (refereegranskat)abstract
    • We investigate the electromagnetic interaction between a gold nanoparticle and a thin gold film on a glass substrate. The coupling between the particle plasmons and the surface plasmon polaritons of the film leads to the formation of two localized hybrid modes, one low-energy. film-like. plasmon and one high-energy plasmon dominated by the nanoparticle. We find that the two modes have completely different directional scattering patterns on the glass side of the film. The high-energy mode displays a characteristic dipole emission pattern while the low-energy mode sends out a substantial part of its radiation in directions parallel to the particle dipole moment. The relative strength of the two radiation patterns vary strongly with the distance between the particle and the film, as determined by the degree of particle-film hybridization. (C) 2011 Optical Society of America
2.
  • Miljkovic, Vladimir D., 1982-, et al. (författare)
  • Simulating light scattering from supported plasmonic nanowires
  • 2012
  • Ingår i: Optics Express. - 1094-4087. ; 20:10, s. 10816-10826
  • Tidskriftsartikel (refereegranskat)abstract
    • We present a method for calculating the differential scattering cross sections from nanostructures close to an interface separating two semi-infinitive dielectric media. The method combines a fast finite element software (Comsol multiphysics), used for calculations of the fields around and inside the structure, and the Green's functions method, which is used to find the far field distribution from the calculated total fields inside the nanostructure. We apply the method to calculations of scattering spectra from silver nanowires supported by an air-glass interface, a system that is of high current interest in relation to various nanophotonics applications. The results are analyzed in relation to analytical models and compared to experimentally measured spectra, to which we find a good agreement. 
3.
  • Sepulveda, Borja, et al. (författare)
  • Shape effects in the localized surface plasmon resonance of single nanoholes in thin metal films
  • 2008
  • Ingår i: Optics Express. - Washington, DC : Optical Society of America. - 1094-4087. ; 16:8, s. 5609-5616
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on the polarization-dependent optical response of elongated nanoholes in optically thin gold films. We measured elastic scattering spectra of spatially isolated ellipsoidal nanoholes with varying aspect ratio and compared the results to electrodynamic simulations. Both experiments and theory show that the plasmon mode that is polarized parallel to the short axis of the ellipsoidal hole red-shifts with increasing aspect ratio. This behavior is completely opposite to the case of elongated metal particles. We present a simple analytical model that qualitatively explains the observations in terms of the different orientations of the induced dipole moments in holes and particles.
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