Smartphone imaging is pretty advanced these days. You can use the camera to takes videos, high-def photographs and even make panoramic images. One day you might be able to use your camera to see through walls.
That capability could come from a new kind of computer chip that operates in the part of the radio spectrum, known as the terahertz range. In this range, wavelengths of radiation are longer than infrared light and shorter than those of high-frequency radio.
Terahertz radiation can penetrate solids in a way similar to X rays, but because it doesn't carry as much energy, it won't damage tissue. Terahertz frequencies are also better than X rays at seeing inside less dense materials, such as water or flesh, and a terahertz scanner is able to detect whether an embedded object is made of metal or plastic. An X-ray machine can only reveal the shape.
Such devices have been making their way into law enforcement and security. But they are big and expensive to set up. Even the portable versions resemble a bulky professional TV camera.