‘Investigators funded by the Air Force Office of Scientific Research are conducting research under the name of “ghost-imaging,” where a visual image of an object is created by means of light that has never interacted with the object.
The new technology may result in a more versatile use of field sensors, and have space applications. [..]
Ghost-imaging is similar to taking a flash-lit photo of an object using a normal camera. The image forms from photons that come out of the flash, bounce off the object, and then are focused through the lens onto photo-reactive film or a charge-coupled array.
“But, in this case, the image is not formed from light that hits the object and bounces back,” Dr. Shih said. “The camera collects photons from the light sources that did not hit the object, but are paired through a quantum effect with others that did. An image of the toy begins to appear after approximately a thousand pairs of photons are recorded.’