Opaque ghosts

The technique of taking pictures by pointing a digital camera at the light source shining on an object rather than the object itself, dubbed ghost imaging, extends to opaque objects. The method works by splitting a weak beam of light and using a photon counter to detect photons bouncing off of the object. Photons that are paired get split, with one of the pair going to the camera and the other the object. The detector signals the camera to record only photons that hit at that moment. The positions of the recorded photons correspond to the positions of photons that hit the object, allowing an image to form. Ghost imaging could lead to new forms of x-ray imaging.

Research paper:
Ghost-Imaging Experiment by Measuring Reflected Photons
Physical Review A, April 2008

Researcher's homepage:
Yanhua Shih

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