3-D Terahertz cloaking
Invisibility appears to be the next possible advance in the use of Terahertz radiation in medicine, security, and communications.
A research team from Northwestern and Oklahoma State universities claims to be first to cloak a three-dimensional object from view in a broad range of Terahertz frequency light, which lies between infrared and microwaves. The team's paper will be presented at this year's Conference on Lasers and Electro Optics (CLEO: 2011, May 1 - 6 in Baltimore).
In the teams paper, Cheng Sun of Northwestern describes how a rigid sponge-like cloaking structure less than 10 millimeters long on a side was built up in 220 layers, each precisely defined to vary the index of refraction and bend light to render invisible anything located beneath a shallow concave bump on the cloaks bottom surface. The group showed that both the physical geometry and the spectrographic signature of a chemical strip about the width of 10 human hairs disappeared when cloaked.
Despite its Harry Potter-like allure, concealing tiny objects from view is not the teams ultimate goal, Sun said. Rather, this latest demonstration shows that the new transformation optics principles and 3-D lithography techniques they used to make the cloak can also enable optical components for guiding, collimating, and focusing terahertz light in a variety of waysin new medical and scientific diagnostic tools, airport security scanners, and data communication devices.