New research could create cellphones that see through walls

Researchers at the University of Texas, Dallas have designed an imager chip that could turn mobile phones into devices that can see through walls, wood, plastics, paper and other objects. The team’s research linked two scientific advances. One involves tapping into an unused range in the electromagnetic spectrum. The other is a new microchip technology. The electromagnetic spectrum characterizes wavelengths of energy. For example, radio waves for AM and FM signals or microwaves used for cell phones or the infrared wavelength that makes night vision devices possible. But the terahertz band of the electromagnetic spectrum, one of the wavelength ranges that falls between microwave and infrared, has not been accessible for most consumer devices.