Coupling effect of spiral-shaped terahertz metamaterials for tunable electromagnetic response

被引：15

作者：

Wang, Dacheng ^{[1
]}

Qiu, Chengwei ^{[1
]}

Hong, Minghui ^{[1
]}

机构：

[1] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117576, Singapore

来源：

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2014年 / 115卷 / 01期

关键词：

Microlenses - Capacitance - Terahertz spectroscopy - Electric fields - Metamaterials;

D O I：

10.1007/s00339-013-7928-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Coupling effect in spiral-shaped metamaterials composed of four half rings at different sizes is investigated to achieve tunability in THz range. This novel spiral-shaped structure was fabricated on flexible substrate with laser micro-lens array (MLA) lithography and measured by THz time domain spectroscopy (THz-TDS). The experimental results suggest that mutual capacitance and inductance coupling in the spiral-shaped structure would result in frequency shifts of the four resonances. The observed shifting trends of the four resonant frequencies are in good agreement with simulation and are further explained by the electric field distribution. By varying the gap sizes among the half rings, four resonant frequencies can be tuned flexibly. Such a spiral-shaped design has potential applications in multi-band tunable THz MEMS devices.

引用

页码：25 / 29

页数：5

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