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      https://www.ias.ac.in/article/fulltext/pram/083/06/1025-1033

    • Keywords

       

      Plasmon; dark-field; fluorescence.

    • Abstract

       

      Anodization of aluminium surfaces containing linearly oriented scratches leads to the formation of nanoporous anodic alumina (NAA) with the nanopores arranged preferentially along the scratch marks. NAA, when coated with a thin gold film, support plasmonic resonances. Dark-field spectroscopy revealed that gold-coated NAA with such linearly arranged pores shows a polarization-dependent scattering, that is larger when the incident light is polarized parallel to the scratch direction than when polarized perpendicular to the scratch direction. Fluorescence studies from rhodamine-6G (R6G) molecules dissolved in polymethylmethacrylate (PMMA) and deposited on these NAA templates showed that fluorescence can be strongly enhanced with the bare NAA due to multiple light scattering in the NAA, while fluorescence from the molecules deposited on gold-coated NAA is strongly quenched due to the strong plasmonic coupling.

    • Author Affiliations

       

      Dheeraj Pratap1 P Mandal1 S Anantha Ramakrishna1

      1. Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208 016, India
    • Dates

       
  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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