Tunable frequency selective surfaces and negative-zero-positive index metamaterials based on liquid crystals

被引：155

作者：

Bossard, Jeremy A. ^{[1
]}

Liang, Xiaotao ^{[1
]}

Li, Ling ^{[1
]}

Yun, Seokho ^{[1
]}

Werner, Douglas H. ^{[1
]}

Weiner, Brian ^{[2
]}

Mayer, Theresa S. ^{[1
]}

Cristman, Paul F. ^{[1
]}

Diaz, Andres ^{[1
]}

Khoo, I. C. ^{[1
]}

机构：

[1] Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USA

[2] Penn State Univ, Dept Phys, Du Bois, PA 15801 USA

来源：

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION | 2008年 / 56卷 / 05期

关键词：

frequency selective surfaces (FSSs); genetic algorithms (GAs); liquid crystals (LCs); metamaterials; negative index materials (NIMs); terahertz; zero index materials (ZIMs);

D O I：

10.1109/TAP.2008.922174

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We utilize the properties of aligned nematic liquid crystal (LC) cells in the design of: (i) a new type of metamaterial whose index of refraction is tunable from negative, through zero, to positive values and (ii) micron-scale metallodielectric and all-dielectric tunable frequency selective surfaces (FSSs). The metamaterial is constructed by randomly doping a liquid crystal substrate with coated dielectric (non-magnetic) spheres and can be utilized over a large spectral range. FSSs with a liquid crystal superstrate are synthesized using conventional and genetic algorithm methods to exhibit broadband tunable filter characteristics at mid-infrared (mid-IR) wavelengths. These LC tunable FSS structures can be used to develop a new class of infrared/optical switches for terahertz applications.

引用

页码：1308 / 1320

页数：13

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