Electrically tunable graphene-based metamaterials: A brief review

2019 ◽  
Vol 33 (33) ◽  
pp. 1950404 ◽  
Author(s):  
Tran Van Huynh ◽  
Bui Son Tung ◽  
Bui Xuan Khuyen ◽  
Nguyen Thanh Tung ◽  
Vu Dinh Lam
Keyword(s):  
Physical Properties ◽  
Electromagnetic Waves ◽  
Recent Progress ◽  
Electromagnetically Induced Transparency ◽  
Promising Candidate ◽  
Perfect Absorption ◽  
Fundamental Interest ◽  
Nonlinear Materials ◽  
Artificial Materials ◽  
Induced Transparency

Metamaterials (MMs) represent a group of exciting artificial materials that interact with electromagnetic waves in unnatural ways. The motivation behind MM research arises not only from fundamental interest in their unique physical properties but also from the desire of creating smarter materials for advanced technological applications. Despite an abundance of studies on numerous shapes, sizes and operating frequencies, the use of conventional metal-dielectric components makes the post-fabrication physical properties of MMs unalterable. Therefore, the integration of other nonlinear materials is necessary for exploring the functional limits of MMs. In this regard, a mono-layer of carbon, the so-called graphene, with its unique electrical conductivity is identified as a promising candidate. This review discusses the recent progress on tunable graphene-based THz MMs for perfect absorption and electromagnetically-induced transparency effects. A short overview of prospect challenges and tendencies is also given for future development of graphene-integrated MMs towards upcoming smart meta-devices.

scholarly journals Electromagnetically induced transparency in plasma

2001 ◽  
Vol 19 (2) ◽  
pp. 175-179 ◽  
Author(s):  
B. ERSFELD ◽  
D.A. JAROSZYNSKI
Keyword(s):  
Electromagnetic Waves ◽  
Plasma Frequency ◽  
Electromagnetically Induced Transparency ◽  
Plane Waves ◽  
Electron Mass ◽  
Number Density ◽  
Relativistic Fluid ◽  
Longitudinal Plasma ◽  
Induced Transparency ◽  
The Waves

The coupled propagation of two electromagnetic waves in plasma is studied to establish the conditions for induced transparency. Induced transparency refers to the situation where both waves propagate unattenuated, although the frequency of one (or both) of them is below the plasma frequency so that it could not propagate in the absence of the other. The effect is due to the interaction of the waves through their beat, which modulates both the electron mass and, by exciting longitudinal plasma oscillations, their number density, and thus the plasma frequency. Starting from a relativistic fluid description, a dispersion relation for plane waves of weakly relativistic intensities is derived, which takes into account the polarization of the waves and the nonlinearities with respect to both their amplitudes. This serves as a basis for the exploration of the conditions for induced transparency and the modes of propagation.

scholarly journals All-dielectric Metamaterial for Electromagnetically-induced Transparency in Optical Region

2020 ◽  
Vol 30 (2) ◽  
pp. 189
Author(s):  
Pham The Linh ◽  
Nguyen Thi Viet Ninh ◽  
Nguyen Dinh Quang ◽  
Tran Tien Lam ◽  
Nguyen Van Ngoc ◽  
...  
Keyword(s):  
Electromagnetic Waves ◽  
Group Delay ◽  
Electromagnetically Induced Transparency ◽  
Dielectric Materials ◽  
Factor Group ◽  
Ohmic Loss ◽  
Q Factor ◽  
Characteristic Parameters ◽  
Optical Region ◽  
Induced Transparency

Metamaterial (MM) is emerging as a promising approach to manipulate electromagnetic waves, spanning from radio frequency to the optical region. In this paper, we employ an effect called electromagnetically-induced transparency (EIT) in all-dielectric MM structures to create a narrow transparent window in opaque broadband of the optical region (580-670 nm). Using dielectric materials instead of metals can mitigate the large non-radiative ohmic loss on the metal surface. The unit-cell of MM consists of Silicon (Si) bars on Silicon dioxide (SiO\(_{2}\)) substrate, in which two bars are directed horizontally and one bar is directed vertically. By changing the relative position and dimension of the Si bars, the EIT effect could be achieved. The optical properties of the proposed MM are investigated numerically using the finite difference method with commercial software Computer Simulation Technology (CST). Then, characteristic parameters of MM exhibiting EIT effect (EIT-MM), including Q-factor, group delay, are calculated to evaluate the applicability of EIT-MM to sensing and light confinement.

scholarly journals Asymmetric excitation of surface plasmons by dark mode coupling

2016 ◽  
Vol 2 (2) ◽  
pp. e1501142 ◽  
Author(s):  
Xueqian Zhang ◽  
Quan Xu ◽  
Quan Li ◽  
Yuehong Xu ◽  
Jianqiang Gu ◽  
...  
Keyword(s):  
Surface Plasmons ◽  
Mode Coupling ◽  
Electromagnetic Waves ◽  
Electromagnetically Induced Transparency ◽  
Near Field ◽  
Coupling Mechanism ◽  
Dark Mode ◽  
Resolution Imaging ◽  
Experimental Findings ◽  
Induced Transparency

Control over surface plasmons (SPs) is essential in a variety of cutting-edge applications, such as highly integrated photonic signal processing systems, deep-subwavelength lasing, high-resolution imaging, and ultrasensitive biomedical detection. Recently, asymmetric excitation of SPs has attracted enormous interest. In free space, the analog of electromagnetically induced transparency (EIT) in metamaterials has been widely investigated to uniquely manipulate the electromagnetic waves. In the near field, we show that the dark mode coupling mechanism of the classical EIT effect enables an exotic and straightforward excitation of SPs in a metasurface system. This leads to not only resonant excitation of asymmetric SPs but also controllable exotic SP focusing by the use of the Huygens-Fresnel principle. Our experimental findings manifest the potential of developing plasmonic metadevices with unique functionalities.

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