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Schematic view of structure and dimensions for two FLs elliptical NIM: , , , and . Inset shows magnified elliptical hole with dimension (, ) in major/minor axis.
Scanning electron microscope images (top view) of elliptical NIMs with (a) one, (b) two, (c) three FLs. The orientation of polarization is displayed ( and denote electric and magnetic field, respectively). The increase in the ellipse dimensions with additional layers is clear.
Measured (top) and simulated (bottom) spectra. Transmission— and reflectance—, and with the specific polarization direction as shown in Fig. 2. The slight blueshift of the experimental reflectivity resonances is due to the off-normal (11°) measurement angle.
Effective parameters (refractive index, FOM, and permeability) for one to three FLs eNIMs. The color convention is that one FL, two FLs, and three FLs eNIMs are black, red, and blue, respectively. Real (imaginary) part of effective parameters in first and third column is displayed with solid lines (lines with unfilled square).
(lines with unfilled squares) and (solid lines) in two FLs eNIMs with SWA 0° (blue) and 13° (red). Solid (open) symbols represent of one and three FLs eNIMs with/without SWA. Color convention: gray (black): one FL eNIM with (without) SWA and three FL eNIMs light (dark) green: with (without) SWA.
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