Figure 1

(a) A driven mechanical system—consisting of two damped mass-spring resonators with mass $m_1=m_2$ and spring constant $\kappa$ linearly coupled by a third spring ${\kappa }_{\mathrm{c}}$—that exhibits an EIT-like response in its power spectrum. (b) Its electrical analogue.Reuse & Permissions

Figure 2

(a) Design with electric coupling. The propagation direction of the incident wave and the directions of the electric and magnetic fields are shown. For this configuration, the resonance of the single-gap SRR is excited electrically by the incident wave, whereas the double-gap SRR is not coupled to the external field. The dimensions are $l_1=l_2=0.9\mu \mathrm{m}$, $w=0.1\mu \mathrm{m}$, $g=0.0035\mu \mathrm{m}$ for the left SRR, and $l_1^{\prime }=0.9\mu \mathrm{m}$, $l_2^{\prime }=0.47\mu \mathrm{m}$, $w^{\prime }=0.1\mu \mathrm{m}$, $g^{\prime }=0.01\mu \mathrm{m}$ for the right SRR. The distance between the two SRRs is chosen $d=0.08\mu \mathrm{m}$ and $d=0.8\mu \mathrm{m}$ in two different simulations. (b) Design with magnetic excitation of the resonance. The propagation direction of the incident wave is shown. For this propagation direction, only the left SRR is excited by the magnetic field of the incident radiation. The dimensions of the SRR are $l=0.9\mu \mathrm{m}$, $w_1=w_2=0.1\mu \mathrm{m}$, and $g=0.05\mu \mathrm{m}$. The dielectric constants are ${\epsilon }_1=10$ with loss tangent of $\tan {\delta }_1=0.01$ and ${\epsilon }_2=10$ with $\tan {\delta }_2=0.001$. The distance along the $H$ axis between the two SRRs is chosen $d=0.2\mu \mathrm{m}$ and $d=0.6\mu \mathrm{m}$. In both structures, the SRRs are taken to be perfect metals and the losses are coming form the dielectric filling in or below the gaps of the SRRs.Reuse & Permissions

Figure 3

(a) Transmission, and (b) Absorption spectra for the metamaterial design in Fig. 2a for two different separations, $d=0.08\mu \mathrm{m}$ (blue line, strong coupling) and $d=0.8\mu \mathrm{m}$ (red line, weak coupling). (c) The real (solid line) and imaginary part (dashed line) of $\epsilon (\omega )$ for the two coupling strengths.Reuse & Permissions

Figure 4

(a) Transmission, and (b) absorption spectra for the metamaterial design in Fig. 2b for two different separations, $d=0.2\mu \mathrm{m}$ (blue line, strong coupling) and $d=0.6\mu \mathrm{m}$ (red line, weak coupling). (c) The real (solid line) and imaginary part (dashed line) of $\mu (\omega )$ for the two coupling strengths.Reuse & Permissions

Figure 5

Real part of the group index (solid line) in comparison to the imaginary part of the index of refraction (dotted line, multiplied by a factor of 200) for the magnetic EIT system shown in Fig. 2b for weak coupling.Reuse & Permissions