(a) shows a schematic of the SRR structure that was optimized in Sec. II. The electric field intensity at 1500 nm, which corresponds to the resonance of the bar, is plotted in (b) and the electric field intensity at 2500 nm, which corresponds to the resonance of the SRR, is plotted in (c). The specific geometry in (b) and (c) corresponds to the optimized spectrum in Fig. 2(c) and Table I.
SRR spectrum optimization using NOMAD with FDTD. Simulations using gold are shown on the left and simulations using silver are shown on the right. The top row corresponds to simulations using the first starting point in Table I and the bottom row corresponds to simulations using the second starting point.
Optimized reflection spectra for arrays of SRRs on sapphire substrates. The array was designed to act as a notch filter at three target wavelengths of , 1550 nm, and 1800 nm, respectively. The dimensions that produced each spectrum are given in Table II.
Starting and optimized dimensions (in nanometers) for the SRR structures tested in Sec. II A. The variables correspond to those listed in Fig. 1. Boundary conditions for were linearly constrained so that: for all optimizations.
Starting and optimized dimensions (in nanometers) for the SRR structures in Sec. II B designed to act as a notch filter at , 1550, and 1800 nm.
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