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(a) The SRR configuration and the labeled SRR design dimensions: split width , the distance between the inner and outer rings , the metal width , and the outer radius . (b) The experimental setup: SRR is attached to the aperture with a diameter of . SRR is shifted by an amount of (in the direction) with respect to the aperture. (c) Measured transmission results for sample SRR A (solid black line), B (solid red line), C (solid green line), and the CRR (dashed blue line).
(a) Experimental and (b) simulation results of the transmission spectra: aperture only (solid black line), aperture with CRR (solid red line), and aperture with sample SRR A (solid green line).
(a) Experimental and (b) numerical analysis of the enhancement figures for three different samples. Sample SRR A (solid black line), B (solid red line), and C (solid green line). Sample SRR A with the losses (solid blue line). Sample SRR A is shifted −0.1 mm (solid light gray line) and 0.4 mm (solid gray line) in the direction with respect to origin of the aperture. The losses are also taken into account during the shifting procedure.
STE factor for various aperture radii, in the range of 2.4–7 mm. Numerical results (black dots), experimental results (blue triangles), and a polynomial fit curve for the numerical results (solid red curve). Inset: Calculated transmission enhancement frequencies corresponding to different aperture sizes.
(a) The induced surface currents on the aperture, (b) aperture with CRR, and (c) aperture with sample SRR A. The region around the aperture is magnified for each case for clarification.
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