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Non-invasive imaging requires the ability to form sharp pictures even when an opaque material act as a screen between the object and the detector. We retrieve the image of an object hidden behind an opaque screen without any need to access the back nor any a-priori knowledge about either the object or the screen itself. We indirectly illuminate the object through the screen and measure its fluorescent signal from the front. We separate the information on the object from the random speckle of the illumination via a spatial autocorrelation of the measured signal. By means of an iterative inversion of the autocorrelation we obtain a faithful image of the hidden object.
© 2013 Optical Society of America
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