Sharp Fano resonances in THz metamaterials

被引：396

作者：

Singh, Ranjan ^{[1
,2
]}

Al-Naib, Ibraheem A. I. ^{[3
]}

Koch, Martin ^{[3
]}

Zhang, Weili ^{[1
]}

机构：

[1] Oklahoma State Univ, Sch Elect & Comp Engn, Stillwater, OK 74078 USA

[2] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Mat Phys & Applicat Div, Los Alamos, NM 87545 USA

[3] Univ Marburg, Dept Phys, D-35032 Marburg, Germany

来源：

OPTICS EXPRESS | 2011年 / 19卷 / 07期

基金：

美国国家科学基金会;

关键词：

PLANAR TERAHERTZ METAMATERIALS; SPLIT-RING RESONATORS; INDUCED TRANSPARENCY; LASING SPASER; DEVICES;

D O I：

10.1364/OE.19.006312

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report on the occurrence of sharp Fano resonances in planar terahertz metamaterials by introducing a weak asymmetry in a two gap split ring resonator. As the structural symmetry of the metamaterial is broken a Fano resonance evolves in the low-frequency flank of the symmetric fundamental dipole mode resonance. This Fano resonance can have much higher Q factors than that known from single gap split ring resonators. Supporting simulations indicate a Q factor of 50 for lowest degree of asymmetry. The Q factor decreases exponentially with increasing asymmetry. Hence, minute structural variations allow for a tuning of the Fano resonance. Such sharp resonances could be exploited for biochemical sensing. Besides, the strong current oscillations excited at the Fano resonance frequency could lead to the design of novel terahertz narrow band emitters. (C) 2011 Optical Society of America

引用

页码：6312 / 6319

页数：8

共 54 条

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