New theory could reduce number of sensors required for
high-resolution imaging systems.
Terahertz imaging, which is already familiar from airport
security checkpoints, has a number of other promising applications — from
explosives detection to collision avoidance in cars. Like sonar or radar,
terahertz imaging produces an image by comparing measurements across an array
of sensors. Those arrays have to be very dense, since the distance between
sensors is proportional to wavelength.