Table of Contents
Physics Research International
Volume 2012 (2012), Article ID 206879, 9 pages
http://dx.doi.org/10.1155/2012/206879
Research Article

Design and Analysis of a THz Metamaterial Structure with High Refractive Index at Two Frequencies

1Electrical and Computer Engineering Department, University of Missouri, Columbia, MO 65201, USA
2MR: comp GmBH, Fuchs Pass 21, 46282 Gelsenkirchen, Germany

Received 25 April 2012; Accepted 11 July 2012

Academic Editor: Yasuo Tomita

Copyright © 2012 Zan Lu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The concept of a single frequency band, single high-refractive-index metamaterial has been extended and applied in the design of dual frequency band, dual high-refractive-index metamaterials in the THz regime. The structure design consists of twenty five unit cells with a surface area of 250 um by 250 um and a thickness of 5 um. Each cell has metallic structures embedded in a polyimide substrate. The return loss (S-parameter) analysis shows two strong electric responses at two frequency ranges, and the extracted constitutive parameters suggested high values of simultaneous dielectric constant and permeability at these frequencies. Results retrieved from the S-parameters also show high refractive index values. A first peak refractive index of 61.83 was observed at a resonant frequency of 0.384 THz, and another peak refractive index of 19.2 was observed at the resonant frequency 1.416 THz. Analysis show that higher refractive index at the second resonance frequency band is achievable through redesign of the structures, and modifications could lead to a single structure with multiple frequency, multiple high-refractive-index metamaterials that can be put to practical use.