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(Color online) (a) AFM image of a closed ring nanoresonator sample. (b) Cross-section profile data measured along the straight line in (a). The linewidth , the unit ring size , the lattice constant , and the thickness , on thick freestanding membrane. (c) and (d) are simulated surface current distributions of an electric dipolar mode (E1) at and a magnetic dipolar mode (M1) at , respectively.
(Color online) Transmission and reflection spectra of the metamaterial in Fig. 1. Results from FDTD simulations are on the left, while the data points in the right panels are experimental results. The solid or dashed curves on the right are multioscillator fits to the data.
(Color online) Real and imaginary parts of the refractive index derived from the multioscillator fits to the experimental grazing angle reflection data shown in Fig. 2. The shaded spectral region indicates the region with negative refractive index. Real and imaginary parts of permittivity and permeability are shown in the inset.
(Color online) Transmission and reflection spectra of closed ring resonators with and . The data points are experimental measurements and the solid curves are multioscillator fits to the data. Inset: real and imaginary parts of the refractive index derived from the fit to the grazing angle reflection data.
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