Impact of Substrate and Bright Resonances on Group Velocity in Metamaterial without Dark Resonator

被引：24

作者：

Hokmabadi, Mohammad Parvinnezhad ^{[1
]}

Kim, Jy-Hyung ^{[1
]}

Rivera, Elmer ^{[1
]}

Kung, Patrick ^{[1
]}

Kim, Seongsin M. ^{[1
]}

机构：

[1] Univ Alabama, Dept Elect & Comp Engn, Tuscaloosa, AL 35487 USA

来源：

SCIENTIFIC REPORTS | 2015年 / 5卷

基金：

美国国家科学基金会;

关键词：

ELECTROMAGNETICALLY INDUCED TRANSPARENCY; SLOW-LIGHT; ANALOG; INFORMATION; SPEED;

D O I：

10.1038/srep14373

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Manipulating the speed of light has never been more exciting since electromagnetic induced transparency and its classical analogs led to slow light. Here, we report the manipulation of light group velocity in a terahertz metamaterial without needing a dark resonator, but utilizing instead two concentric split-ring bright resonators (meta-atoms) exhibiting a bright Fano resonance in close vicinity of a bright Lorentzian resonance to create a narrowband transmittance. Unlike earlier reports, the bright Fano resonance does not stem from an asymmetry of meta-atoms or an interaction between them. Additionally, we develop a method to determine the metamaterial "effective thickness", which quantifies the influence of the substrate on the metamaterial response and has remained challenging to estimate so far. By doing so, very good agreement between simulated and measured group delays and velocities is accomplished. The proposed structure and method will be useful in designing optical buffers, delay lines, and ultra-sensitive sensors.

引用

页数：11

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