Imperial physicists have recreated the famous double-slit experiment, which showed light behaving as particles and a wave, in time rather than space. In a groundbreaking development, Imperial College London physicists have recreated the historic double-slit experiment, which demonstrated light be
Imperial physicists have performed the double-slit experiment in time, using materials that can change optical properties in femtoseconds, providing insights into the nature of light and paving the way for advanced materials that can control light in both space and time.
The original double-slit experiment, performed in 1801 by Thomas Young at the Royal Institution, showed that light acts as a wave. Further experiments, however, showed that light actually behaves as both a wave and as particles – revealing its quantum nature. Lead researcher Professor Riccardo Sapienza, from the Department of Physics at Imperial, said: “Our experiment reveals more about the fundamental nature of light while serving as a stepping-stone to creating the ultimate materials that can minutely control light in both space and time.”Project member Romain Tirole adjusts the equipment used in the study at Imperial College London.
Light can also be parcelled up into ‘particles’ called photons, which can be recorded hitting the detector one at a time, gradually building up the striped interference pattern. Even when researchers fired just oneat a time, the interference pattern still emerged, as if the photon split in two and travelled through both slits.
The material is a metamaterial – one that is engineered to have properties not found in nature. Such fine control of light is one of the promises of, and when coupled with spatial control, could create new technologies and even analogues for studying fundamental physics phenomena like black holes.
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