Magnetically coupled electromagnetically induced transparency analogy of dielectric metamaterial

Abstract

In this manuscript, we experimentally demonstrate magnetically coupled electromagnetically induced transparency (EIT) analogy effect inside dielectric metamaterial. In contrast to previous studies employed different metallic topological microstructures to introduce dissipation loss change, barium strontium titanate, and calcium titanate (CaTiO3) are chosen as the bright and dark EIT resonators, respectively, due to their different intrinsic dielectric loss. Under incident magnetic field excitation, dielectric metamaterial exhibits an EIT-type transparency window around 8.9 GHz, which is accompanied by abrupt change of transmission phase. Numerical calculations show good agreement with experiment spectra and reveal remarkably increased group index, indicating potential application in slow light.

Substrate-Mediated Broadband Tunability in Plasmonic Resonances of Metal Nanoantennas on Finite High-Permittivity Dielectric Substrate

“…Some extra space was added around the target nanostructure in the simulation model within the open boundaries to shows only contributions from scattering where absorption is negligible. The low energy peak λ 2 is attributed to dipolar resonance of interfering electric and magnetic modes [28][29][30], whereas the high energy peaks are due to higher order multipoles. For demonstration of the concept, here, we consider the sub-wavelength gold nanocube to have an edge length of L = 80 nm, which also sets the constraints on the minimal dimensions of the finite nanocuboid substrate suitable for the study.…”

Switching and extension of transmission response, based on bending metamaterials

“…The phenomena are obtained by the broken structural symmetry or by the near-field subwavelength-scale coupling 10–12 . The latter origin of EIT can be interpreted by the near-field coupling between a radiative bright resonator that couples strongly with the incident light, and a dark resonator that couples weakly with light 13, 14 . However, the EIT-like behavior also occurs without the dark-mode excitation, which is described by the interference between bright modes 15 .…”

Magnetic metamaterial analog of electromagnetically induced transparency and absorption

“…However, most proposed magnetic EIT metamaterials are three dimensional and difficult to fabricate. 14,18,19 Moreover, the magnetic interaction is much weaker than the electric interaction, and thus it is more difficult to realize EIT effects in magnetic metamaterials.…”

“…This phenomenon is well-known as the metamaterial-based EIT phenomenon. 14,19 To understand the physical nature of the magnetic EIT structure, the surface current distributions around resonant frequencies of EIT transmission window are displayed in Figs. 3(a)-3(c).…”