Highly-dispersive transparency at optical frequencies in planar metamaterials based on two-bright-mode coupling

Abstract

Using a planar metamaterial, which consists of two silver strips, we theoretically demonstrate the plasmonic electromagnetically-induced transparency (EIT)-like spectral response at optical frequencies. The two silver strips serve as the bright modes, and are excited strongly by the incident wave. Based on the weak hybridization between the two bright modes, a highly-dispersive plasmonic EIT-like spectral response appears in our scheme. Moreover, the group index is higher than that of another scheme which utilizes the strong coupling between the bright and dark modes.

Design of Metaparticles as Sharp Frequency-Selective Obscurant Aerosols

“…As the SRRs get closer to each other, the transparency window becomes wider and stronger in amplitude due to strong coupling. This coupling is similar to the phenomena of electrically induced transparency (EIT) [21]. The surface current distribution at the low and high energy modes are shown in Figure 6, for which a separation distance of d = 3 mm is chosen.…”

“…The fractional bandwidth calculated at −3 dB transmission is 6.4% for the loss-free substrate. Figure 8(b) shows the corresponding phase of the S 21 parameter.…”

Electromagnetically Induced Absorption in Metamaterials in the Infrared Frequency

“…DISCUSSION Figure 7 shows the transmission spectra of the EIT and EIA structures as a function of the symmetry parameter s, we see that the narrow transmission/absorption window becomes more pronounced and shifted to lower frequencies for the EIA structure as the s parameter increases. For s = 0 the EIT and EIA disappear as breaking symmetry is a requirement for both the EIT and EIA effect [8][9][10][11][12][13][14].…”

“…A bright mode element couples strongly with the incident excitation field while the dark element does not couple with the incident field but couples with the magnetic field induced by the bright element. Several EIT metamaterial structures have been employed and reported in the microwave, terahertz and optical frequency regions [8][9][10][11][12][13][14].…”

Electromagnetically induced transparency in nano-structures made from metallic nanorod and split-ring-resonator

“…Here, compared to conventional structure, we propose a stacked structure with novel property, that is EIT phenomenon of excitation which can be controlled by LCP or RCP. Firstly, through analyzing the electric field distributions, we demonstrate that the constructive interference strengthens the coupling between the bright and bright resonators [21,24], which results in the transparent window in a broad frequency region. Then by changing the value of the geometrical parameters s, the exotic chirality can be introduced in the structure.…”