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Coupling Efficiency of Surface Plasmon Polaritons: Far- and Near-Field Analyses

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Abstract

The excitation of surface plasmon polaritons (SPPs) through one-dimentional (1D) metallic (Au) grating on higher refractive index -GaP substrate is investigated. Such grating devices find potential applications in real world, only if the coupling efficiency (η) of a free-space transverse-magnetic plane-wave into a SPPs mode is maximum. A simple and robust technique is used to estimate the η, by simply measuring the transmission through the grating while varying slit width (a) but period (Λ) and the thickness (t) remain fixed. When the wave vector (k 0 ) of the incident light is matched to that of SPP, highest η is achieved. It is found that Λ/3 < a < Λ/2 yields a maximum η where the intermediate scattering couples more incident energy to SPPs. These gratings are designed in such a way that they support only the fundamental plasmonic mode yielding higher η. Scanning near-field optical measurements also confirm and corroborate the observations of far-field and near-field modeling (COMSOL multiphysics) results.

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Acknowledgments

Dr Tahir Iqbal greatly acknowledge all concern quarters for their technical and financial help to complete this research work.

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Authors and Affiliations

  1. Department of Physics, Faculty of Science, University of Gujrat, Hafiz Hayat Campus, Gujrat, 50700, Pakistan

    Tahir Iqbal

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  1. Tahir Iqbal
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Correspondence to Tahir Iqbal.

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Iqbal, T. Coupling Efficiency of Surface Plasmon Polaritons: Far- and Near-Field Analyses. Plasmonics 12, 215–221 (2017). https://doi.org/10.1007/s11468-016-0252-z

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