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Design Optimisation of Plasmonic Metasurfaces for Mid-Infrared High-Sensitivity Chemical Sensing

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Abstract

In this paper, we report on a general method to optimise the optical characteristics of 2D-arrays of plasmonic gold nanoantennas performing as band-pass filter functionalised metasurfaces to be used as high-sensitivity mid-infrared spectroscopic sensors. We demonstrate that it is possible to increase their sensitivity in the detection of chemical and biological substances when the sensors are used in the surface-enhanced infrared absorption (SEIRA) technique. This technique allows revealing the presence of a substance adsorbed on the nanoantennas by measuring its optical absorption under the conditions for which the maximum value of the functionalised metasurface reflectivity occurs at the same wavelength of the substance maximum absorption peak. In particular, numerical simulations based on finite element method of the metasurface detection response demonstrate the possibility to increase the sensor sensitivity of more than four orders of magnitude with respect to that one achievable if the same amount of the substance is deposited on an unstructured planar metal surface. These results can be obtained by acting on the 2D-array periodicity, nanoantenna shape (i.e. rod and cross), size and thickness independently from the wavelength at which the substance absorption occurs. Moreover, in the case of cross-shaped nanoantennas, we report a complete numerical characterisation of the dependence of the metasurface maximum reflectivity and peak wavelength on the variation of the geometrical parameters of both the nanoantennas and the 2D-array.

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Authors and Affiliations

  1. Department of Industrial and Information Engineering and Economics, University of L’Aquila, L’Aquila, Italy

    A. De Marcellis, E. Palange & M. Janneh

  2. Department of Science and High Technology, University of Insubria, Como, Italy

    C. Rizza

  3. CNR-SPIN, National Council of Research, L’Aquila, Italy

    C. Rizza & A. Ciattoni

  4. Electro-Optics Research Centre, CREO Consortium, L’Aquila, Italy

    S. Mengali

Authors
  1. A. De Marcellis
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  2. E. Palange
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  3. M. Janneh
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  4. C. Rizza
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  5. A. Ciattoni
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  6. S. Mengali
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Correspondence to A. De Marcellis.

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De Marcellis, A., Palange, E., Janneh, M. et al. Design Optimisation of Plasmonic Metasurfaces for Mid-Infrared High-Sensitivity Chemical Sensing. Plasmonics 12, 293–298 (2017). https://doi.org/10.1007/s11468-016-0263-9

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  • DOI: https://doi.org/10.1007/s11468-016-0263-9

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