Local excitation of surface plasmon polaritons at discontinuities of a metal film: Theoretical analysis and optical near-field measurements

Salomon, L.; Bassou, Ghaouti; Aourag, H.; Dufour, Jean-Paul; Fornel, Frédérique de; Carcenac, F.; Zayats, Anatoly V.

doi:10.1103/physrevb.65.125409

Cited by 66 publications

(44 citation statements)

References 20 publications

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“…Here, ( /(1 )) n = ℜ + ε ε is the real part of the effective refractive index of the SPP, with ε being the complex-valued dielectric function of gold [9,22]. Interpolating data from Ref.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

“…The polaritons can be detected by a variety of techniques, among them holographic recording [11], observation of SPP-induced stray light with a camera [7], two-photon photo-emission electron microscopy [8,12], and SNOM [9,10]. Recently, the s-SNOM technique [1,13,14] was also employed, in this case to investigate SPPs on a gold film with a nano-trench etched into it.…”

Section: Introductionmentioning

confidence: 99%

“…SPPs on conductive surfaces have usually been excited by illumination of edges, trenches, and other surface disruptions with electromagnetic radiation, which has a component of the electrical radiation field perpendicular to the respective boundary [7][8][9][10]. The polaritons can be detected by a variety of techniques, among them holographic recording [11], observation of SPP-induced stray light with a camera [7], two-photon photo-emission electron microscopy [8,12], and SNOM [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Anisotropic excitation of surface plasmon polaritons on a metal film by a scattering-type scanning near-field microscope with a non-rotationally-symmetric probe tip

et al. 2017

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Abstract:We investigated the excitation of surface plasmon polaritons on gold films with the metallized probe tip of a scattering-type scanning near-field optical microscope (s-SNOM). The emission of the polaritons from the tip, illuminated by near-infrared laser radiation, was found to be anisotropic and not circularly symmetric as expected on the basis of literature data. We furthermore identified an additional excitation channel via light that was reflected off the tip and excited the plasmon polaritons at the edge of the metal film. Our results, while obtained for a non-rotationally-symmetric type of probe tip and thus specific for this situation, indicate that when an s-SNOM is employed for the investigation of plasmonic structures, the unintentional excitation of surface waves and anisotropic surface wave propagation must be considered in order to correctly interpret the signatures of plasmon polariton generation and propagation.

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Section: Experimental Results and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Anisotropic excitation of surface plasmon polaritons on a metal film by a scattering-type scanning near-field microscope with a non-rotationally-symmetric probe tip

et al. 2017

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“…6 Among them are excitation using illumination through a probe of a scanning near-field optical microscope 7 by a highly focused laser beam 8,9 or by a radially polarized Bessel beam 10 and excitation at discontinuities of a metal film, 11 launching surface plasmons through an array of nanoholes, 12 through a subwavelength slit supplemented with a periodic set of grooves 13 or by a surface protrusion defect in form of a particle or a single ridge 14 as well as by a periodic set of those. 15 The efficiency of light-SPP coupling, defined as the ratio of SPP power to that of light, for some configurations has been evaluated both experimentally and numerically.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of local surface plasmon polariton excitation on ridges

et al. 2008

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The issue of efficient local coupling of light into surface plasmon polariton ͑SPP͒ modes is an important concern in miniaturization of plasmonic components. Here we present experimental and numerical investigations of efficiency of local SPP excitation on gold ridges of rectangular profile positioned on a gold film. The excitation is accomplished by illuminating the metal surface normally with a focused laser beam. Wavelength dependence and dependence of the efficiency on geometrical parameters of ridges are examined. Using leakage radiation microscopy, the efficiency of ϳ20% is demonstrated experimentally. Numerical simulations based on Green's tensor approach are in good agreement with the experiment and allow suggesting an optimization of parameters for improving the efficiency of SPP excitation.

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“…The excitation of SPPs is important since it can provide the coupling between different gammadions as well as the coupling between the branches of the same gammadion. The SPP excitation is non-resonant in this case due to the period of the structure but occurs due to diffraction on the grove edges [9]. The orientation of the polarization of the incident light with respect to the grooves determines the direction of the allowed SPP modes [10].…”

Section: Near-field Imaging Of Enantiomeric Chiral Structuresmentioning

confidence: 99%