Multi-band absorption induced by near-field coupling and defects in metamaterial

A metamaterial (MM), mimicking electromagnetically-induced transparency (EIT) in the GHz regime, was demonstrated numerically and experimentally by exploiting the near-field coupling of asymmetric split-ring and cut-wire resonators. By moving the resonators towards each other, the original resonance dip was transformed to a multi-band EIT. The phenomenon was explained clearly through the excitation of bright and dark modes. The dispersion characteristic of the proposed MM was also investigated, which showed a strongly-dispersive behavior, leading to a high group index and a time delay of the MM. Our work is expected to contribute a simple way to develop the potential devices based on the multi-band EIT effect.

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Multi-Band Absorption Properties and Near-Field Enhancement in Mid-Infrared Based on the Interference Theory

Chinese Physics Letters ◽

10.1088/0256-307x/31/5/054201 ◽

2014 ◽

Vol 31 (5) ◽

pp. 054201 ◽

Cited By ~ 1

Author(s):

Hang Heng ◽

Li Yang

Keyword(s):

Near Field ◽

Field Enhancement ◽

Interference Theory ◽

Absorption Properties ◽

Mid Infrared ◽

Band Absorption ◽

Multi Band

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Terahertz multi-band unidirectional reflectionless phenomenon in a MIM plasmonic waveguide system based on near-field coupling

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s0218863519500085 ◽

2019 ◽

Vol 28 (01) ◽

pp. 1950008 ◽

Cited By ~ 2

Author(s):

Tianyi Dai ◽

Fei Zhao ◽

Cong Zhang ◽

Xing Ri Jin ◽

Ying Qiao Zhang ◽

...

Keyword(s):

Near Field ◽

Plasmonic Waveguide ◽

Dual Band ◽

Metal Insulator ◽

Exceptional Points ◽

Field Coupling ◽

Metal Insulator Metal ◽

Waveguide System ◽

Multi Band

Dual-band unidirectional reflectionlessness is investigated in a system consisting of three stub resonators side-coupled to a metal-insulator-metal plasmonic waveguide based on near-field coupling in terahertz domain. Reflectivities of [Formula: see text] and [Formula: see text], respectively, at two exceptional points 4.11[Formula: see text]THz and 4.695[Formula: see text]THz are obtained for forward (backward) direction. More than that multi-band unidirectional reflectionlessness is demonstrated based on multi-stub resonators side-coupled to an MIM plasmonic waveguide.

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Independently tunable electromagnetically induced transparency effect and dispersion in a multi-band terahertz metamaterial

Scientific Reports ◽

10.1038/s41598-019-54414-5 ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 8

Author(s):

Rakesh Sarkar ◽

Dipa Ghindani ◽

Koijam Monika Devi ◽

S. S. Prabhu ◽

Amir Ahmad ◽

...

Keyword(s):

Slow Light ◽

Electromagnetically Induced Transparency ◽

Near Field ◽

The Other ◽

Transmission Spectra ◽

Field Coupling ◽

Induced Transparency ◽

Coupled Harmonic Oscillator ◽

Bright Mode ◽

Multi Band

AbstractIn this article, we experimentally and numerically investigate a planar terahertz metamaterial (MM) geometry capable of exhibiting independently tunable multi-band electromagnetically induced transparency effect (EIT). The MM structure exhibits multi-band EIT effect due to the strong near field coupling between the bright mode of the cut-wire (CW) and dark modes of pair of asymmetric double C resonators (DCRs). The configuration allows us to independently tune the transparency windows which is challenging task in multiband EIT effect. The independent modulation is achieved by displacing one DCR with respect to the CW, while keeping the other asymmetric DCR fixed. We further examine steep dispersive behavior of the transmission spectra within the transparency windows and analyze slow light properties. A coupled harmonic oscillator based theoretical model is employed to elucidate as well as understand the experimental and numerical observations. The study can be highly significant in the development of multi-band slow light devices, buffers and modulators.

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Multi-band and broadband metamaterial perfect absorber based on conductive polymer and near-field coupling

International Journal of Modern Physics B ◽

10.1142/s0217979219503648 ◽

2019 ◽

Vol 33 (30) ◽

pp. 1950364

Author(s):

Le Dac Tuyen ◽

Pham The Linh ◽

Dang Hong Luu ◽

Le Danh Phuong ◽

Tong Ba Tuan ◽

...

Keyword(s):

Structural Design ◽

Near Field ◽

Conductive Polymer ◽

Perfect Absorber ◽

Simple Method ◽

Field Coupling ◽

Disk Resonators ◽

Polarization Independent ◽

Metamaterial Perfect Absorber ◽

Multi Band

We present a simple method for enhancing the bandwidth and absorptivity of metamaterial perfect absorber (MPA)-formed disk resonators. Utilizing low-conductivity polymer and near-field coupling of multi-band resonances, a 6.8 GHz broadband MPA is achieved with absorption over 90%. The proposed MPA also shows polarization-independent absorption behavior. Furthermore, the structural design is useful for making broadband MPA and can be applied to higher frequencies with a simple configuration.

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