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Defeating diffraction – Physics World

Defeating diffraction – Physics World
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Novel scattering-invariant light mode probes opaque materials

Novel ‘scattering-invariant’ light mode probes opaque materials 15 Apr 2021 Researchers at Utrecht and TU Vienna develop new form of light waves that travel through opaque materials. Big Dipper: a beam passes undisturbed through a disordered medium. Click for info.Researchers at Utrecht University, The Netherlands, and at TU Wien (Vienna, Austria) have created a special type of lightwaves that can penetrate opaque materials and pass through – as if the material were not obstructing or interrupting them. The scientists say that, for any specific disordered medium, the tailor-made light beams can be constructed that are practically not changed by the medium, but only attenuated.

The indestructible light beam

 E-Mail IMAGE: A scattering-invariant mode of light is generated by sending a laser beam onto a judiciously configured spatial light modulator (see quadratic pixel array on the left). This modulated beam then. view more  Credit: Allard Mosk/Matthias Kühmayer Why is sugar not transparent? Because light that penetrates a piece of sugar is scattered, altered and deflected in a highly complicated way. However, as a research team from TU Wien (Vienna) and Utrecht University (Netherlands) has now been able to show, there is a class of very special light waves for which this does not apply: for any specific disordered medium such as the sugar cube you may just have put in your coffee tailor-made light beams can be constructed that are practically not changed by this medium, but only attenuated. The light beam penetrates the medium, and a light pattern arrives on the other side that has the same shape as if the medium were not there at all.

Optimale Information über das Unsichtbare

Optimale Information über das Unsichtbare
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