Dynamically Tunable Electromagnetically Induced Transparency in Graphene-Based Coupled Micro-ring Resonators

The classical electromagnetically-induced transparency (EIT)-like switching in metamaterials was experimentally demonstrated in the microwave-frequency region. The metameterial unit cell consists of two identical split-ring resonators, which are arranged on both sides of a dielectric substrate with 90°-rotation asymmetry. In our scheme, the classical EIT-like switching can be achieved by changing the polarization of the incident electromagnetic wave.

Download Full-text

Electromagnetically induced transparency (EIT)-like transmission in side-coupled complementary split-ring resonators

Optics Express ◽

10.1364/oe.20.024348 ◽

2012 ◽

Vol 20 (22) ◽

pp. 24348 ◽

Cited By ~ 56

Author(s):

Yinghui Guo ◽

Lianshan Yan ◽

Wei Pan ◽

Bin Luo ◽

Kunhua Wen ◽

...

Keyword(s):

Electromagnetically Induced Transparency ◽

Ring Resonators ◽

Split Ring ◽

Split Ring Resonators ◽

Induced Transparency

Download Full-text

Tunable optical analog to electromagnetically induced transparency in graphene-ring resonators system

Scientific Reports ◽

10.1038/srep38891 ◽

2016 ◽

Vol 6 (1) ◽

Cited By ~ 12

Author(s):

Yonghua Wang ◽

Chenyang Xue ◽

Zengxing Zhang ◽

Hua Zheng ◽

Wendong Zhang ◽

...

Keyword(s):

Electromagnetically Induced Transparency ◽

Ring Resonators ◽

Optical Analog ◽

Induced Transparency

Download Full-text

Numerical analysis of effective refractive index bio-sensor based on graphene-embedded slot-based dual-micro-ring resonator

International Journal of Modern Physics B ◽

10.1142/s0217979220501453 ◽

2020 ◽

Vol 34 (17) ◽

pp. 2050145

Author(s):

C. Y. Zhao ◽

P. Y. Chen ◽

P. Y. Li ◽

C. M. Zhang

Keyword(s):

Electromagnetically Induced Transparency ◽

Extinction Ratio ◽

Fdtd Method ◽

Ring Resonators ◽

Compact Structure ◽

Coupled Mode ◽

Mode Field ◽

Sensor Structure ◽

On Chip ◽

Induced Transparency

We propose a novel bio-sensor structure composed of slot dual-micro-ring resonators and mono-layer graphene. Based on the electromagnetically induced transparency (EIT)-like phenomenon and the light-absorption characteristics of graphene, we present a theoretical analysis of transmission by using the coupled mode theory and Kubo formula. The results demonstrate the EIT-like spectrum with asymmetric line profile. The mode-field distributions of transmission spectrum are obtained from 3D simulations based on finite-difference time-domain (FDTD) method. Our bio-sensor exhibits theoretical sensitivity of 330 nm/RIU, a minimum detection limit of [Formula: see text] RIU, the maximum extinction ratio of 4.4 dB, the quality factor of [Formula: see text] and a compact structure of [Formula: see text]. Finally, the bio-sensor’s performance is simulated for glucose solution. Our proposed design provides a promising candidate for on-chip integration with other silicon photonic element.

Download Full-text

Ultra-Broadband Electromagnetically induced Transparency in Metamaterial Based on Conductive Coupling

10.21203/rs.3.rs-777775/v1 ◽

2021 ◽

Author(s):

Tiantian Zheng ◽

Zhongyin Xiao ◽

Mingming Chen ◽

Xiang Miao ◽

Xiaoyu Wang

Keyword(s):

Slow Light ◽

Electromagnetically Induced Transparency ◽

Type System ◽

Surface Current ◽

Wide Band ◽

Light Filter ◽

Ring Resonators ◽

Linear Optics ◽

Dark Mode ◽

Induced Transparency

Abstract In this paper, a structure comprising a horizontal metal strip resonator(SR) and four C-shape ring resonators(CRRs) is proposed, obtaining a broadband electromagnetically induced transparency-like(EIT-like) effect. The SR and CRRs are classified into bright mode and dark mode depending on whether they can be directly excited by the incident electromagnetic wave. The three-level Λ -type system and electric field are used to explain the mechanism of EIT-like effect. Meanwhile, by decreasing the distance between SR and CRRs, a transparency window of 1.4THz with relative bandwidth of 91.93% is observed. It is found that when the bright and dark mode are directly contacted, the EIT window increases rapidly via conductive coupling, which can be explained by the surface current. Our work provides a new method for wide band EIT-like effect, which has certain value in the field of slow light, filter and non-linear optics.

Download Full-text

Tunable electromagnetically induced transparency based on terahertz graphene metamaterial

RSC Advances ◽

10.1039/c7ra06770d ◽

2017 ◽

Vol 7 (64) ◽

pp. 40321-40326 ◽

Cited By ~ 18

Author(s):

Xunjun He ◽

Yiming Huang ◽

Xingyu Yang ◽

Lei Zhu ◽

Fengmin Wu ◽

...

Keyword(s):

Relaxation Time ◽

Fermi Energy ◽

Electromagnetically Induced Transparency ◽

Ring Resonators ◽

Split Ring ◽

Split Ring Resonators ◽

Induced Transparency

The terahertz EIT graphene metamaterial, consisting of two coupled split ring resonators placed in orthogonally twisted fashion, was proposed by patterning graphene. An actively controlled EIT peak can be obtained by changing relaxation time or Fermi energy of graphene.

Download Full-text

Tunable Metamaterial with Gold and Graphene Split-Ring Resonators and Plasmonically Induced Transparency

Nanomaterials ◽

10.3390/nano9010007 ◽

2018 ◽

Vol 9 (1) ◽

pp. 7 ◽

Cited By ~ 3

Author(s):

Qichang Ma ◽

Youwei Zhan ◽

Weiyi Hong

Keyword(s):

Electromagnetically Induced Transparency ◽

Transparency Window ◽

Ring Resonators ◽

Metamaterial Structure ◽

Split Ring ◽

Split Ring Resonators ◽

Electrostatic Gating ◽

Tunable Metamaterial ◽

Induced Transparency ◽

Plasmonically Induced Transparency

In this paper, we propose a metamaterial structure for realizing the electromagnetically induced transparency effect in the MIR region, which consists of a gold split-ring and a graphene split-ring. The simulated results indicate that a single tunable transparency window can be realized in the structure due to the hybridization between the two rings. The transparency window can be tuned individually by the coupling distance and/or the Fermi level of the graphene split-ring via electrostatic gating. These results could find significant applications in nanoscale light control and functional devices operating such as sensors and modulators.

Download Full-text

Wideband and multiband electromagnetically induced transparency in graphene metamaterials

International Journal of Modern Physics B ◽

10.1142/s0217979219500681 ◽

2019 ◽

Vol 33 (09) ◽

pp. 1950068 ◽

Cited By ~ 1

Author(s):

Renxia Ning ◽

Xiang Gao ◽

Zhenhai Chen

Keyword(s):

Communication Technology ◽

Slow Light ◽

Electromagnetically Induced Transparency ◽

Microwave Frequency ◽

Ring Resonators ◽

Group Index ◽

Frequency Range ◽

Split Ring ◽

Structure Lead ◽

Induced Transparency

A multiband tunable electromagnetic induced transparency (EIT) effect in metamaterial at microwave frequency range is investigated. The sandwich structure contains silicon dioxide and gold layers. The metamaterial structure has multiband EIT phenomenon due to coupling with U-Shaped split-ring resonators (SRRs) and cut wire (CW). Two different modes can be obtained in CW and a single band EIT effects in SRRs. Results show that the different resonances in the structure lead to multiband EIT. By adding the finding of the graphene layer on top of the structures, EIT window can be changed obviously. It is shown that the graphene can adjust EIT phenomenon. The group index is calculated to exhibit the slow light effect. The demonstrated phenomenon can provide valuable variety of important applications, including microwave communication technology, microwave devices, slow light and switch devices.

Download Full-text

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

Nanoscale Research Letters ◽

10.1186/s11671-019-3180-y ◽

2019 ◽

Vol 14 (1) ◽

Cited By ~ 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.

Download Full-text

Electrical Manipulation of Electromagnetically Induced Transparency for Slow Light Purpose Based on Metal-Graphene Hybrid Metamaterial

Applied Sciences ◽

10.3390/app8122672 ◽

2018 ◽

Vol 8 (12) ◽

pp. 2672 ◽

Cited By ~ 4

Author(s):

Chenxi Liu ◽

Song Zha ◽

Peiguo Liu ◽

Cheng Yang ◽

Qihui Zhou

Keyword(s):

Slow Light ◽

Electromagnetically Induced Transparency ◽

Critical Index ◽

Hybrid Structure ◽

Strip Width ◽

Ring Resonators ◽

Dark Mode ◽

Surface Distribution ◽

Induced Transparency ◽

Hybrid Metamaterial

A terahertz metamaterial is presented and numerically investigated to achieve tunable electromagnetically induced transparency (EIT) for slow light. The unit cell consists of cut-wire pairs and U-shaped ring resonators with graphene strips placed between the metal film and the SiO2/Si substrate. Through bright-dark mode coupling, the radiative resonance induced by the U-shaped ring is suppressed, and then the typical EIT effect is realized. The transparency window and the accompanied group delay can be electrically manipulated with different Fermi energy of the graphene. By analyzing the surface distribution, the underlying tuning mechanism of this hybrid metamaterial is investigated in detail. Moreover, the transparency peak decreases slightly with the increasing strip width of the graphene layer but completely vanishes as the strip width exceeds the length of the covered U-shaped ring. The influence of the critical index of graphene quality, i.e., carrier mobility on the EIT effect, is considered. The results of this study may provide valuable guidance in designing and analyzing tunable EIT structures based on a metal-graphene hybrid structure for slow light purposes.

Download Full-text