Terahertz Detectors Could See Through Your Clothes From a Mile Away

"Someone may soon be able to tell what types material are in your pockets from tens, and possibly thousands, of feet away.

Using terahertz remote sensing, detectors could see through walls, clothing and packaging materials and immediately identify the unique terahertz waves of 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...