## Abstract

We examine a new class of volumetric metamaterials based on two-dimensional (2D) transmission-line layers that exhibit a negative refractive index (NRI). The dispersion characteristics of a single 2D layer are revealed through a periodic analysis, and the effective-medium response of the volumetric layered topology is predicted by an intuitive equivalent circuit model. Dispersion and transmission characteristics are also obtained for various designs by using full-wave finite-element method (FEM) simulations, including one design meeting the requirements of Veselago’s slab lens in free space, and suggest an isotropic NRI over bandwidths anywhere from 25% to 45%. Finally, the potential to implement these metamaterials from terahertz to near-infrared and optical frequencies is discussed.

© 2006 Optical Society of America

Full Article | PDF Article**OSA Recommended Articles**

Ashwin K. Iyer, Peter C. Kremer, and George V. Eleftheriades

Opt. Express **11**(7) 696-708 (2003)

Andrea Vallecchi and Filippo Capolino

Opt. Express **17**(17) 15216-15227 (2009)

Koray Aydin, Zhaofeng Li, Levent Sahin, and Ekmel Ozbay

Opt. Express **16**(12) 8835-8844 (2008)