Design of Broadband Plasmon‐Induced Transparency Hybrid Metamaterial Based on the Interaction of the Metal and Dielectric Resonances

Abstract

In this paper, a broadband plasmon-induced transparency (PIT) hybrid metamaterial system (HMS) is realized and numerically demonstrated via the interference between different resonance modes of metal and dielectric resonators. The employed PIT HMS supports a strong near-fired coupling between unit cells consisting of eight TiO 2 nested split rings (dark plasmonic resonators) surrounded by four metal cut wires (bright plasmonic resonators) embedded in the intermediate dielectric layer, and a broad transparency window which is higher than 0.9 is obtained from 0.61 to 0.76 THz with a relative bandwidth of 21.9%. In the transparent window, the drastic change of phase leads to high group delay, and the remarkable slow light phenomenon can be clearly observed. The maximum of the group delay and group index can reach 528 ps and 2880, respectively. The localization distributions of the electromagnetic field intuitively exhibit the generation and action process of destructive interference. The theoretical investigation of the two-oscillator model further confirms the effectiveness and consistency of the simulation results. In addition, the fourfold symmetric of the proposed PIT HMS supports the liberation from the dependence of incident polarization form. Such an implementation opens a new path for the designing of filtering, switching, and data storing devices.

Dielectric‐Based Electromagnetically Induced Transparency Metamaterial in the Microwave Band

“…The atoms absorb the energy and jump from | 1 > to | 3 > when a strong pumping beam is supplied, creating a transition channel. [32] Similarly, when a probing light is provided, a transition channel is generated from the metastable energy level | 2 > to the excited energy level | 3 > . The EIT phenomenon is caused by the destructive interference between the two transition channels.…”

Broadband Plasmon‐Induced Transparency to a Electromagnetically Induced Absorption Conversion Metastructure Based on Germanium

“…[41] As seen in Figure 1b, the dielectric spacer between the top CRFS and the middle layer CPR is transparent material PMMA (relative permittivity 𝛿 PMMA = 2.5, loss tangent tan𝛿 PMMA = 0) [42] with a thickness of h 3 = 10 μm, which is introduced to facilitate the light to change the working state of the CPR. The remaining two layers are quartz substrates (𝛿 quartz = 3.793, tan𝛿 quartz = 0.0008) [23] with intermediate layer thickness h 2 =6 μm and bottom layer thickness h 1 =32 μm. As shown in Figure 1c-f, the four C-shaped dielectric rings as dark plasma resonators are composed of Titanium dioxide (TiO 2 , 𝛿 TiO2 = 114, tan𝛿 TiO2 = 0.00027).…”

“…In recent years, the rise of the so-called metastructures, [5] that is, metamaterials and metasurfaces, have broken the bottleneck of EIT development. As subwavelength artificial periodic composites, metastructures have unique and exotic physical properties, such as negative refraction [19,20] and electromagnetic polarization manipulation, [21][22][23] which have become the "favorites" of many laboratories. To further miniaturize EIT-related devices, plasmon-induced transparency (PIT) has been proposed.…”