• Magnetic response of split-ring resonator metamaterials: From effective medium dispersion to photonic band gaps

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      https://www.ias.ac.in/article/fulltext/pram/078/03/0483-0492

    • Keywords

       

      Metamaterials, split-ring resonators, magnetic resonance.

    • Abstract

       

      On systematically investigating the electromagnetic response of periodic split-ring resonator (SRR) metamaterials as a function of the size-to-wavelength ($a/\lambda$) ratio, we find that the stop bands due to the geometric resonances of the SRR weaken with increasing ($a/\lambda$) ratio, and are eventually replaced by stop bands due to Bragg scattering. Our study traces the behaviour of SRR-based metamaterials as the resonance frequency increases and the wavelength of the radiation finally becomes comparable to the size of the unit cell of the metamaterial. In the intermediate stages, the dispersion of the SRR metamaterial can still be described as due to a localized magnetic resonances while Bragg scattering finally becomes the dominant phenomenon as $a/\lambda \sim 1/2$.

    • Author Affiliations

       

      Sangeeta Chakrabarti1 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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