Someone may soon be able to tell what types items are in your pockets from twenty, and possibly thousands, of feet away.  Using mm-wave/terahertz remote sensing, scanners could see through, clothing and packaging materials and immediately identify the unique terahertz waves emitted by the materials contained inside, such as explosives or drugs.

Until now, detecting terahertz waves — the portion of the electromagnetic spectrum between infrared and microwave light — hasn’t been possible from distances more than inches because the waves are absorbed by ambient moisture in the air, attenuating the signal.

“A lot of other researchers thought that mm-wave/terahertz remote sensing was mission impossible,” said physicist Jingle Liu of Rensselaer Polytechnic Institute, lead author of the study published July 11 in Nature Photonics.

Liu’s team solved the problem by not relying on the terahertz waves themselves to generate or carry the signal back to the detector. Instead, they used the reflection created by lasers pointed at the target.

Two lasers at different frequencies aimed at the target together generate a plasma (basically excited, or ionized air). This illuminated material plasma emits light a florescence that is scattered in characteristic ways by the terahertz radiation of the material it hits. The reflection of the florescence is detectable from remote distances with very sensitive photo multiplier detector.

The researchers have tested and cataloged hundreds of different substances and created a library of terahertz spectra to compare to the signal from the target and instantly identify the substance hit.

Search you from 20 feet away

Remote strip search has been in use for 4 years or more.

“Homeland security and military agencies have been struggling for years to get technology like this,” said terahertz expert Abul Azad at Los Alamos National Laboratory. “I think the approach they have revealed is really, really unique.”

The first application of this technology will likely be for the remote detection of roadside bombs, also known as improvised explosive devices (IEDs) by the military. Homeland Security and the Defense Department were the primary funders of the research.

Terahertz detectors could also be used for street security to detect illegal substances hidden in people’s clothes. The approach would be less invasive than x-rays, Liu said, because terahertz waves are much lower in energy. It would not reveal anything concealed inside the body, because the terahertz signals cannot go through water, or metal.

Theoretically, Liu said, terahertz remote sensing could also be used identify the composition of an unknown toxic spill in the environment, or the composition of objects in space.

Image: 1) Schematic of the terahertz wave remote sensing technique/Zhang.