Lensless imaging due to back-scattering

Details Lensless imaging due to back-scattering Lensless imaging due to back-scattering

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.348..708r&link_type=abstract

Nature (ISSN 0028-0836), vol. 348, Dec. 27, 1990, p. 708-710.

Physics

Optics

3

Charge Coupled Devices, Image Processing, Lens Design, Light Scattering, Specular Reflection, Backscattering, Far Fields, Focusing, Image Analysis

Scientific paper

It is demonstrated that light scattered from a disordered medium or a roughened surface will form an image of the light source without the use of any focusing optics. The image is superimposed on a relatively uniform background of scattered light, which can be removed by suitably processing the output from a CCD detector. Images of several sources have been obtained using both laser and incandescent light sources. The imaging is interpreted as being caused by coherent backscattering, a phenomenon which has been invoked to explain a well-known intensity maximum in the far-field backscattered light from a random medium. This work amplifies and explains an earlier report of 'pseudoimaging' of a point source by 'retroreflection'.

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