scholarly journals Variable group delay in a metamaterial with field-gradient-induced transparency

2012 ◽  
Vol 85 (7) ◽  
Author(s):  
Yasuhiro Tamayama ◽  
Toshihiro Nakanishi ◽  
Masao Kitano
Keyword(s):  
Field Gradient ◽  
Group Delay ◽  
Induced Transparency ◽  
Variable Group

scholarly journals Electromagnetic response of a metamaterial with field-gradient-induced transparency

2010 ◽  
Vol 82 (16) ◽  
Author(s):  
Yasuhiro Tamayama ◽  
Toshihiro Nakanishi ◽  
Yasuhiro Wakasa ◽  
Tetsuo Kanazawa ◽  
Kazuhiko Sugiyama ◽  
...  
Keyword(s):  
Field Gradient ◽  
Electromagnetic Response ◽  
Induced Transparency

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 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.

Tunable Terahertz Plasmon-Induced Transparency in Resonator-Coupled Dirac Semimetal Waveguides

2021 ◽  
Vol 36 (6) ◽  
pp. 676-683
Author(s):  
Daobin Wang ◽  
Jiahuan Yang ◽  
Wei Wang ◽  
Lihua Yuan ◽  
Xiaoxiao Li
Keyword(s):  
Optical Properties ◽  
Fermi Energy ◽  
Delay Time ◽  
Group Delay ◽  
The Finite Element Method ◽  
Group Delay Time ◽  
Dirac Semimetal ◽  
Induced Transparency ◽  
Maximum Group ◽  
Plasmon Induced Transparency

The bulk Dirac semimetal (BDS) is an interesting material, similar to graphene, which can dynamically adjust its optical properties via a variation in its Fermi energy or electrical voltage. In this work, a BDS-based plasmonic device, which enables tunable terahertz plasmon-induced transparency, was proposed and designed. By using the finite element method, the surface plasmon polariton and plasmon-induced transparency of this device were systematically investigated. The results demonstrate that the plasmon-induced transparency of such device can be dynamically tuned by varying its Fermi energy. When the Fermi energy changes from 55 meV to 95 meV, the maximum group delay time of the device increases from 13.2 ps to 21 ps. In the case of a cascading device, the maximum group delay time can be further pushed up to 44.57 ps. The influence of the ambient refractive index on the optical properties of the proposed device was also considered and investigated.

scholarly journals Power transmission and group delay in gain-assisted plasmon-induced transparency

AIP Advances ◽  
2013 ◽  
Vol 3 (3) ◽  
pp. 032138 ◽  
Author(s):  
Zi-Lan Deng ◽  
Jian-Wen Dong ◽  
He-Zhou Wang ◽  
S. H. Cheng ◽  
Jensen Li
Keyword(s):  
Group Delay ◽  
Power Transmission ◽  
Induced Transparency ◽  
Plasmon Induced Transparency
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