A tailored ultra-broadband electromagnetically induced transparency metamaterial based on graphene

Abstract Based on graphene, an ultra-broadband electromagnetically induced transparency (EIT) window with dynamic tunability is realized in theory. Through altering the Fermi level of graphene that can be regulated by the external voltage, the EIT window and the EIT effect, especially the slow-wave effect, can be easily adjusted. Moreover, the bandwidth of the EIT window can be changed by the incidence angle, achieving the transformation from broadband to narrowband. At the same time, by discussing the polarization state and loss index, the characteristics of polarization insensitivity and low loss are proved. Additionally, the influences of other parameters are discussed, such as the relaxation time of graphene and coupling distance. These unique features enable the designed EIT metamaterial to be masterly applied to optical switches, optical modulators, and slow-light devices.

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Double Electromagnetically Induced Transparency and Its Slow Light Application Based on a Guided-Mode Resonance Grating Cascade Structure

Materials ◽

10.3390/ma13173710 ◽

2020 ◽

Vol 13 (17) ◽

pp. 3710

Author(s):

Guofeng Li ◽

Junbo Yang ◽

Zhaojian Zhang ◽

Yuyu Tao ◽

Lingjun Zhou ◽

...

Keyword(s):

Slow Light ◽

Electromagnetically Induced Transparency ◽

Wide Band ◽

Theoretical Explanation ◽

Low Loss ◽

Guided Mode ◽

Delay Times ◽

Cascade Structure ◽

Guided Mode Resonance ◽

Induced Transparency

In recent years, the achievement of the electromagnetically induced transparency (EIT) effect based on the guided-mode resonance (GMR) effect has attracted extensive attention. However, few works have achieved a double EIT-like effect using this method. In this paper, we numerically achieve a double EIT-like effect in a GMR system with a three-layer silicon nitride waveguide grating structure (WGS), using the multi-level atomic system model for theoretical explanation. In terms of slow light performance, the corresponding two delay times reach 22.59 ps and 8.43 ps, respectively. We also investigate the influence of wavelength detuning of different GMR modes on the transparent window and slow light performance. Furthermore, a wide-band flat-top transparent window was also achieved by appropriately adjusting the wavelength detuning between GMR modes. These results indicate that the EIT-like effect in the WGS has potential application prospects in low-loss slow optical devices, optical sensing, and optical communications.

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Analogue Electromagnetically Induced Transparency Based on Low-loss Metamaterial and its Application in Nanosensor and Slow-light Device

Plasmonics ◽

10.1007/s11468-016-0309-z ◽

2016 ◽

Vol 12 (3) ◽

pp. 641-647 ◽

Cited By ~ 32

Author(s):

Zhongchao Wei ◽

Xianping Li ◽

Nianfa Zhong ◽

Xiaopei Tan ◽

Xiaomeng Zhang ◽

...

Keyword(s):

Slow Light ◽

Electromagnetically Induced Transparency ◽

Low Loss ◽

Induced Transparency

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Probing Bloch oscillations using a slow-light sensor

Advanced Optical Technologies ◽

10.1515/aot-2020-0028 ◽

2020 ◽

Vol 9 (5) ◽

pp. 243-246

Author(s):

Pei-Chen Kuan ◽

Chang Huang ◽

Shau-Yu Lan

Keyword(s):

Phase Shift ◽

Optical Lattice ◽

Cold Atoms ◽

Slow Light ◽

Internal State ◽

Electromagnetically Induced Transparency ◽

Bloch Oscillations ◽

Bloch Oscillation ◽

Induced Transparency ◽

Transparency Condition

AbstractWe implement slow-light under electromagnetically induced transparency condition to measure the motion of cold atoms in an optical lattice undergoing Bloch oscillation. The motion of atoms is mapped out through the phase shift of light without perturbing the external and internal state of the atoms. Our results can be used to construct a continuous motional sensor of cold atoms.

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Enhanced slow light in superconducting electromagnetically induced transparency metamaterials

Superconductor Science and Technology ◽

10.1088/0953-2048/26/7/074004 ◽

2013 ◽

Vol 26 (7) ◽

pp. 074004 ◽

Cited By ~ 15

Author(s):

B B Jin ◽

J B Wu ◽

C H Zhang ◽

X Q Jia ◽

T Jia ◽

...

Keyword(s):

Slow Light ◽

Electromagnetically Induced Transparency ◽

Induced Transparency

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Dual-Tunable Polarization Insensitive Electromagnetically Induced Transparency in Metamaterials

Journal of Electronic Materials ◽

10.1007/s11664-020-08692-9 ◽

2021 ◽

Author(s):

Renxia Ning ◽

Zhiqiang Xiao ◽

Zhenhai Chen ◽

Wei Huang

Keyword(s):

Vanadium Dioxide ◽

Mode Coupling ◽

Slow Light ◽

Chemical Potential ◽

Electromagnetically Induced Transparency ◽

Dark Mode ◽

Potential Applications ◽

Polarization Insensitive ◽

Terahertz Devices ◽

Induced Transparency

AbstractA multilayer structure of a square ring of graphene with nesting vanadium dioxide (VO2) was investigated in this study. This structure exhibits electromagnetically induced transparency (EIT), which stems from a bright mode coupling with a dark mode. The permittivity values of graphene and VO2 can be modulated via chemical potential and temperature, respectively. The EIT effect can be tuned based on the chemical potential of graphene and temperature of VO2, resulting in a dual-tunable EIT effect. Simulation results confirmed that this dual-tunable EIT phenomenon is insensitive to polarization. These results may have potential applications in terahertz devices, such as slow light devices, switching devices, and sensors.

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