2007
DOI: 10.1364/ol.32.002535
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Surface plasmon interference excited by tightly focused laser beams

Abstract: We show that interfering surface plasmon polaritons can be excited with a focused laser beam at normal incidence to a plane metal film. No protrusions or holes are needed in this excitation scheme. Depending on the axial position of the focus, the intensity distribution on the metal surface is either dominated by interferences between counterpropagating plasmons or by a two-lobe pattern characteristic of localized surface plasmon excitation. Our experiments can be accurately explained by use of the angular spe… Show more

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Cited by 160 publications
(97 citation statements)
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“…the effect is relatively inefficient directly at the tip apex at the wavelength of our experiments; rather, the dominant source is the part of the illuminated area immediately in front of the apex. This is reminiscent of SPP generation on a continuous metal film by tightly focused laser light [27]. The role of the probe tip with regard to SPP generation seems to lie in the reflection/scattering of the laser light nearly vertically down.…”
Section: Anisotropy -Full-wave Simulationsmentioning
confidence: 97%
“…the effect is relatively inefficient directly at the tip apex at the wavelength of our experiments; rather, the dominant source is the part of the illuminated area immediately in front of the apex. This is reminiscent of SPP generation on a continuous metal film by tightly focused laser light [27]. The role of the probe tip with regard to SPP generation seems to lie in the reflection/scattering of the laser light nearly vertically down.…”
Section: Anisotropy -Full-wave Simulationsmentioning
confidence: 97%
“…Their applications range from particle trapping [86], subdiffraction limited tighter focusing [87] and plasmon excitation [88] to laser machining [89]. Laguerre-Gauss beams are well known examples of light beams possessing optical vortices forming a straight nodal line surrounded by light [90].…”
Section: Generating a 3d Dark Focus With Conical Refractionmentioning
confidence: 99%
“…With satisfying the boundary condition of the surface plasma wave ε low · ε High < 0 and ε low + ε high < 0, where ε high and ε low are the dielectric constants of the intermediate area plasma and the mimic plasma, the surface plasma wave will be formed. The formation and properties of the surface plasma wave have been studied extensively in previous studies [16][17][18]. Eq.…”
Section: Simulation Results and Discussionmentioning
confidence: 99%