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

Jeremy A. Bossard, Xiaotao Liang, Ling Li, Seokho Yun, Douglas H. Werner, Brian Weiner, Theresa S. Mayer, Paul F. Cristman, Andres Diaz, I. C. Khoo

Research output: Contribution to journalArticle

121 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)1308-1320
Number of pages13
JournalIEEE Transactions on Antennas and Propagation
Volume56
Issue number5
DOIs
StatePublished - May 2008

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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