Abstract
We apply numerical optimization methods in combination with full-field electromagnetic simulations to tailor the broadband spectral response of gold and silver split-ring resonator metamaterials. A derivative-free, nonlinear mesh adaptive search technique was used to drive finite-difference time-domain simulations. This algorithm allows the designer to independently vary the spectral position of the two resonant peaks and their relative reflection amplitudes throughout a wide range of the near infrared. An application of this method is then shown to design split-ring resonator “notch filters,” with narrow pass bands at 1310, 1550, and 1800 nm which have an ∼45% change in reflectivity at the pass band and corresponding linewidths of ∼90 meV.
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