"T-Hz: Metamaterial plumbs terahertz region"
Metamaterial experts have bridged the terahertz-gap by demonstrating a magnetic sensor based on split-ring resonators. SRRs function as artificial atoms in a metamaterial, but are actually constructed from concentric planar copper rings. By shrinking a microwave (millimeter wavelengths) SRR from 5 millimeters to 50 microns, researchers said they demonstrated a magnetic response that bridges the terahertz gap (micron wavelengths), thereby opening the door to solid-state sensors that can see through some solid objects.
Audio Interview / Text: http://www.eetimes.com/story/OEG20040305S0023