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Curved Gratings as Plasmonic Lenses for Linearly Polarised Light

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Abstract

The ability of curved gratings as sectors of concentric circular gratings to couple linearly polarised light into focused surface plasmons is investigated by theory, simulation, and experiment. The experimental and simulation results show that increasing the sector angle of the curved gratings decreases the width of the lateral distribution of surface plasmons resulting in focusing of surface plasmons, which is analogous to the behaviour of classical optical lenses. We also show that two faced curved gratings, with their groove radius mismatched by half of the plasmon wavelength (asymmetric configuration), can couple linearly polarised light into a single focal spot of concentrated surface plasmons with smaller depth of focus and higher intensity in comparison to single curved gratings. The major advantage of these structures is the coupling of linearly polarised light into focused surface plasmons with access to, and control of, the plasmon focal spot, which facilitate their potential applications in sensing, detection, and nonlinear plasmonics.

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Acknowledgments

This research was supported by the Australian Research Council Centre of Excellence for Ultra-high bandwidth Devices for Optical Systems (project number CE110001018) and Macquarie University. We also acknowledge CSIRO for the FIB facilities and thank Steven Moody for FIB operation.

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Authors and Affiliations

  1. ARC Centre of Excellence CUDOS, Macquarie University, Sydney, NSW 2109, Australia

    Alireza Maleki, Thanh Phong Vo, Antoine Hautin, David W Coutts & Judith M Dawes

  2. MQ Photonics Research Centre, Department of Physics and Astronomy, Macquarie University, Sydney, NSW 2109, Australia

    Alireza Maleki, Thanh Phong Vo, Antoine Hautin, James E Downes, David W Coutts & Judith M Dawes

  3. Ecole Centrale de Lyon, 36 Avenue Guy de Collongue, 69134, Ecully Cedex, France

    Antoine Hautin

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  1. Alireza Maleki
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  2. Thanh Phong Vo
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Correspondence to Alireza Maleki.

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Maleki, A., Vo, T.P., Hautin, A. et al. Curved Gratings as Plasmonic Lenses for Linearly Polarised Light. Plasmonics 11, 365–372 (2016). https://doi.org/10.1007/s11468-015-0031-2

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  • DOI: https://doi.org/10.1007/s11468-015-0031-2

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