DocumentCode :
1212310
Title :
Tunable Frequency Selective Surfaces and Negative-Zero-Positive Index Metamaterials Based on Liquid Crystals
Author :
Bossard, Jeremy A. ; Liang, Xiaotao ; Li, Ling ; Yun, Seokho ; Werner, Douglas H. ; Weiner, Brian ; Mayer, Theresa S. ; Cristman, Paul F. ; Diaz, Andres ; Khoo, I.C.
Author_Institution :
Dept. of Electr. Eng., Pennsylvania State Univ., University Park, PA
Volume :
56
Issue :
5
fYear :
2008
fDate :
5/1/2008 12:00:00 AM
Firstpage :
1308
Lastpage :
1320
Abstract :
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.
Keywords :
frequency selective surfaces; genetic algorithms; metamaterials; nematic liquid crystals; optical materials; broadband tunable filter; genetic algorithms; liquid crystals; mid-infrared wavelengths; negative-zero-positive index metamaterials; tunable frequency selective surfaces; Dielectric liquids; Dielectric substrates; Doping; Frequency selective surfaces; Genetic algorithms; Liquid crystals; Metamaterials; Optical filters; Optical switches; Submillimeter wave filters; Frequency selective surfaces (FSSs); genetic algorithms (GAs); liquid crystals (LCs); metamaterials; negative index materials (NIMs); terahertz; zero index materials (ZIMs);
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.2008.922174
Filename :
4512130
Link To Document :
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