• Observation of Fano resonance in silver nanocube–nanosphere dimer

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      https://www.ias.ac.in/article/fulltext/pram/094/0128

    • Keywords

       

      Fano resonance; nanocube–nanosphere dimer; plasmonic biosensor; figure of merit.

    • Abstract

       

      In this paper, we perform a theoretical investigation of the plasmon coupling in silver (Ag) nanocube–nanosphere dimer using finite difference time domain (FDTD) technique. Due to plasmonic Fano resonance, we observe a pronounced dip in the absorption spectrum, which is induced by the destructive interference between the bright dipole mode from the Ag nanocube and the dark quadrupole mode from the Ag nanosphere. We study the effects on the Fano resonance by varying the dimensions of the nanocube and nanosphere, as well as the intersurface gap distance between them. In addition, we vary the local dielectric environment surrounding the dimer and find a wide tuning in the Fano resonance line-shape. We calculate the localised surface plasmon resonance (LSPR) sensitivity of the nanocube–nanosphere dimer to the surrounding environment and find a high figure of merit (FOM) of 32.23, which indicates its promising potential as a plasmonic biosensor.

    • Author Affiliations

       

      AVIJIT DAS1 2 ARIK AHMED3 MD MEHEDI HASAN1

      1. Department of Electrical and Electronic Engineering, BRAC University, Dhaka, Bangladesh
      2. Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, USA
      3. Department of Mathematics and Natural Sciences, BRAC University, Dhaka, Bangladesh
    • Dates

       
  • Pramana – Journal of Physics | News

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