Three-dimensional magnetic terahertz metamaterials using a multilayer electroplating technique
Journal Article

Published: Thursday, March 15, 2012
Citation: Journal of Micromechanics and Microengineering, Volume 22, Number 4, Pages 045011

Authors (1 total): A. C. Strikwerda


At the moment, I am undable to add other authors to this work here. The full author list is: Kebin Fan1, Andrew C Strikwerda2, Richard D Averitt2 and Xin Zhang1

In the last decade, the development of metamaterials has led to exotic phenomena not shown in nature, including negative refractive index, invisibility cloaking and perfect absorption. To achieve these effects requires creating magnetically resonant subwavelength structures, since naturally occurring magnetism typically occurs at relatively low frequencies. In the far-infrared, or terahertz (THz), region of the electromagnetic spectrum, it is difficult to obtain a strong magnetic response from planar metamaterials at normal incidence. In this paper, multilayer electroplating is used to fabricate three-dimensional (3D) split-ring resonators that stand up out of plane. This enables the maximum coupling to the magnetic response at normal incidence. Characterization using THz time-domain spectroscopy indicates a strong magnetic resonance, and parameter extraction reveals a negative permeability from 1 to 1.3 THz with the minimal value of −2. The successful design, fabrication and characterization of 3D metamaterials provide opportunities to achieve different electromagnetic properties and novel devices in the THz range.