Optical Imaging

Revealing the hidden movers

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Science  16 Jun 2017:
Vol. 356, Issue 6343, pp. 1135-1136
DOI: 10.1126/science.356.6343.1135-f

Radar and lidar use pulses of electromagnetic radiation (typically microwaves or laser light) to track and range stationary or moving objects. However, when the object is obscured or hidden from view within a scattering medium, these technologies are ineffective. Akhlaghi and Dogariou have devised an imaging process that can track a hidden target as it moves within a scattering medium. Illuminating one side of the scattering medium with coherent light creates a speckle pattern on the other side. By monitoring changes in the speckle pattern, they show that the spatial and temporal movement of the target can be reconstructed. The technique could find application in biomedical imaging and remote sensing, as well as being applicable to other areas such as acoustics and microwaves.

Optica 4, 447 (2017).

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