Tunable Frequency Selective Surfaces and Negative-Zero-Positive Index Metamaterials Based on Liquid Crystals

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...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2008-05, Vol.56 (5), p.1308-1320
Main Authors: Bossard, J.A., Xiaotao Liang, Ling Li, Seokho Yun, Werner, D.H., Weiner, B., Mayer, T.S., Cristman, P.F., Diaz, A., Khoo, I.C.
Format: Article
Language:English
Subjects:
Antennas
Applied sciences
Dielectric liquids
Dielectric substrates
Diffraction, scattering, reflection
Doping
Exact sciences and technology
Frequency selective surfaces
Frequency selective surfaces (FSSs)
Genetic algorithms
genetic algorithms (GAs)
Infrared
Liquid crystals
liquid crystals (LCs)
Metamaterials
negative index materials (NIMs)
Optical filters
Optical switches
Optical switching
Radiocommunications
Radiowave propagation
Spectra
Submillimeter wave filters
Telecommunications
Telecommunications and information theory
terahertz
Wavelengths
zero index materials (ZIMs)
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2008.922174