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Fano Resonances in Compositional Clusters of Aluminum Nanodisks at the UV Spectrum: a Route to Design Efficient and Precise Biochemical Sensors

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Abstract

In this study, we have investigated the plasmon resonance coupling between proximal compositional Al nanoparticles that are organized in a closely spaced molecular orientation as nanoclusters. Plasmon hybridization model is employed as a theoretical model to study the spectral response of the proposed nanostructures. The optical properties of trimer, heptamer, and octamer clusters based on Al/Al2O3 nanodisks are evaluated using finite-difference time-domain (FDTD) model numerically. We have proved that a constructive and weak interference between subradiant dark and superradiant bright modes as the plasmon resonance modes causes the appearance of strong Fano resonances at the spectral response of the heptamer and octamer clusters at the UV spectrum. The effects and results of the structural and chemical modifications in the proposed nanoclusters have been discussed and determined. Finally, illuminating an octamer cluster composed of Al/Al2O3 nanoparticles and simultaneous modifications in the refractive index of the dielectric environment lead to dramatic changes in the position and quality of the Fano dip. Plotting a linear figure of merit (FoM) for the proposed octamer and quantifying this parameter for the structure as 7.72, we have verified that the structure has a strong potential to be used in designing precise localized surface plasmon resonance (LSPR) sensors that are able to sense minor environmental perturbations with high accuracy. Proposed clusters composed of Al/Al2O3 provide an opportunity to design and fabricate low-cost, high responsivity, tunable, and CMOS-compatible devices and efficient biochemical sensors.

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Authors and Affiliations

  1. School of Engineering-Emerging Technologies, University of Tabriz, Tabriz, 5166614761, Iran

    Saeed Golmohammadi

  2. Young Researchers and Elite Club, Ahar Branch, Islamic Azad University, Ahar, Iran

    Arash Ahmadivand

Authors
  1. Saeed Golmohammadi
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  2. Arash Ahmadivand
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Correspondence to Arash Ahmadivand.

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Golmohammadi, S., Ahmadivand, A. Fano Resonances in Compositional Clusters of Aluminum Nanodisks at the UV Spectrum: a Route to Design Efficient and Precise Biochemical Sensors. Plasmonics 9, 1447–1456 (2014). https://doi.org/10.1007/s11468-014-9762-8

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  • DOI: https://doi.org/10.1007/s11468-014-9762-8

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