Optical Imaging

Stealthy spying on a moving target

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Science  25 Jul 2014:
Vol. 345, Issue 6195, pp. 414
DOI: 10.1126/science.345.6195.414-b

Ghost imaging can create an image of a moving target without the target ever knowing that it is being watched. The traditional way to observe an object, either stationary or in motion, is to illuminate it and use the light that it reflects or scatters to create an image on a detector such as a camera. However, the observation of the object can itself be detected, which compromises the stealth of the process. Ghost imaging, a technique that forms an image with photons that have never even come into contact with the object, has been used to detect objects at rest, and now Li et al. show that it also can be used to reconstruct the image of moving targets, such as the small wafer that they use in their demonstration.

Appl. Phys. Lett. 104, 251120 (2014).

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