Electromagnetically induced transparency in terahertz metamaterial based on two-bright-mode resonator

2017 ◽  
Vol 13 (2) ◽  
pp. 95-99 ◽  
Author(s):  
Yan Liu ◽  
Sai Chen ◽  
Fei Fan ◽  
Meng Chen ◽  
Jin-jun Bai ◽  
...  
Keyword(s):  
Electromagnetically Induced Transparency ◽  
Induced Transparency ◽  
Bright Mode ◽  
Mode Resonator

scholarly journals Broadband Filter and Adjustable Extinction Ratio Modulator Based on Metal-Graphene Hybrid Metamaterials

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1359 ◽  
Author(s):  
Haoying Sun ◽  
Lin Zhao ◽  
Jinsong Dai ◽  
Yaoyao Liang ◽  
Jianping Guo ◽  
...  
Keyword(s):  
Electromagnetically Induced Transparency ◽  
Extinction Ratio ◽  
Optical Filters ◽  
Superior Performance ◽  
Dark Mode ◽  
Terahertz Communications ◽  
Transmission Window ◽  
Induced Transparency ◽  
Bright Mode ◽  
Mode Resonator

A novel multifunctional device based on a hybrid metal–graphene Electromagnetically induced transparency (EIT) metamaterial at the terahertz band is proposed. It is composed of a parallel cut wire pair (PCWP) that serves as a dark mode resonator, a vertical cut wire pair (VCWP) that serves as a bright mode resonator and a graphene ribbon that serves as a modulator. An ultra-broadband transmission window with 1.23 THz bandwidth can be obtained. The spectral extinction ratio can be tuned from 26% to 98% by changing the Fermi level of the graphene. Compared with previous work, our work has superior performance in the adjustable bandwidth of the transmission window without changing the structure of the dark and bright mode resonators, and has a high extinction ratio and dynamic adjustability. Besides, we present the specific application of the device in filters and optical modules. Therefore, we believe that such a metamaterial structure provides a new way to actively control EIT-like, which has promising applications in broadband optical filters and photoelectric intensity modulators in terahertz communications.

scholarly journals Tunable Plasmon-Induced Transparency through Bright Mode Resonator in a Metal–Graphene Terahertz Metamaterial

2020 ◽  
Vol 10 (16) ◽  
pp. 5550
Author(s):  
Guanqi Wang ◽  
Xianbin Zhang ◽  
Xuyan Wei
Keyword(s):  
Group Delay ◽  
Monolayer Graphene ◽  
Device Structure ◽  
Coupling Condition ◽  
Conductive Film ◽  
Induced Transparency ◽  
Bright Mode ◽  
Mode Resonator ◽  
The Ideal ◽  
Plasmon Induced Transparency

The combination of graphene and metamaterials is the ideal route to achieve active control of the electromagnetic wave in the terahertz (THz) regime. Here, the tunable plasmon-induced transparency (PIT) metamaterial, integrating metal resonators with tunable graphene, is numerically investigated at THz frequencies. By varying the Fermi energy of graphene, the reconfigurable coupling condition is actively modulated and continuous manipulation of the metamaterial resonance intensity is achieved. In this device structure, monolayer graphene operates as a tunable conductive film which yields actively controlled PIT behavior and the accompanied group delay. This device concept provides theoretical guidance to design compact terahertz modulation devices.

scholarly journals Experimental Demonstration of Electromagnetically Induced Transparency in a Conductively Coupled Flexible Metamaterial with Cheap Aluminum Foil

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Jie Hu ◽  
Tingting Lang ◽  
Weihang Xu ◽  
Jianjun Liu ◽  
Zhi Hong
Keyword(s):  
Electromagnetically Induced Transparency ◽  
Near Field ◽  
Surface Current ◽  
Aluminum Foil ◽  
Ring Resonators ◽  
Dark Mode ◽  
Field Coupling ◽  
New Ideas ◽  
Induced Transparency ◽  
Bright Mode

AbstractWe propose a conductively coupled terahertz metallic metamaterial exhibiting analog of electromagnetically induced transparency (EIT), in which the bright and dark mode antennae interact via surface currents rather than near-field coupling. Aluminum foil, which is very cheap and often used in food package, is used to fabricate our metamaterials. Thus, our metamaterials are also flexible metamaterials. In our design, aluminum bar resonators and aluminum split ring resonators (SRRs) are connected (rather than separated) in the form of a fork-shaped structure. We conduct a numerical simulation and an experiment to analyze the mechanism of the proposed metamaterial. The surface current due to LSP resonance (bright mode) flows along different paths, and a potential difference is generated at the split gaps of the SRRs. Thus, an LC resonance (dark mode) is induced, and the bright mode is suppressed, resulting in EIT. The EIT-like phenomenon exhibited by the metamaterial is induced by surface conducting currents, which may provide new ideas for the design of EIT metamaterials. Moreover, the process of fabricating microstructures on flexible substrates can provide a reference for producing flexible microstructures in the future.

scholarly journals Graphene plasmonically induced analogue of tunable electromagnetically induced transparency without structurally or spatially asymmetry

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Yuwen He ◽  
Jianfa Zhang ◽  
Wei Xu ◽  
Chucai Guo ◽  
Ken Liu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Fano Resonance ◽  
Electromagnetically Induced Transparency ◽  
Plasmon Coupling ◽  
Graphene Ribbon ◽  
Dark Mode ◽  
Physical Understanding ◽  
Coherent Coupling ◽  
Induced Transparency ◽  
Bright Mode

AbstractElectromagnetically induced transparency (EIT) arises from the coherent coupling and interference between a superradiant (bright) mode in one resonator and a subradiant (dark) mode in an adjacent resonator. Generally, the two adjacent resonators are structurally or spatially asymmetric. Here, by numerical simulation, we demonstrate that tunable EIT can be induced by graphene ribbon pairs without structurally or spatially asymmetry. The mechanism originates from the fact that the resonate frequencies of the bright mode and the dark mode supported by the symmetrical graphene ribbon pairs can be respectively tuned by electrical doping levels, and when they are tuned to be equal the graphene plasmon coupling and interference occurs. The EIT in symmetrical nanostructure which avoids deliberately breaking the element symmetry in shape as well as in size facilitates the design and fabrication of the structure. In addition, the work regarding to EIT in the structurally symmetric could provide a fresh contribution to a more comprehensive physical understanding of Fano resonance.

scholarly journals Electromagnetically induced transparency control in terahertz metasurfaces based on bright-bright mode coupling

2018 ◽  
Vol 97 (15) ◽  
Author(s):  
R. Yahiaoui ◽  
J. A. Burrow ◽  
S. M. Mekonen ◽  
A. Sarangan ◽  
J. Mathews ◽  
...  
Keyword(s):  
Mode Coupling ◽  
Electromagnetically Induced Transparency ◽  
Induced Transparency ◽  
Bright Mode

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

2019 ◽  
Vol 9 (1) ◽  
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.

scholarly journals Analogue of electromagnetically induced transparency with high-Q factor in metal-dielectric metamaterials based on bright-bright mode coupling

2019 ◽  
Vol 27 (26) ◽  
pp. 37590 ◽  
Author(s):  
Fengyan He ◽  
Bingxin Han ◽  
Xiangjun Li ◽  
Tingting Lang ◽  
Xufeng Jing ◽  
...  
Keyword(s):  
Mode Coupling ◽  
Electromagnetically Induced Transparency ◽  
Q Factor ◽  
High Q ◽  
Induced Transparency ◽  
Bright Mode
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