Arago Spot With Matter Waves
Recently, the Arago spot experiment has been demonstrated with a supersonic expansion beam of deuterium molecules, so-called neutral matter waves. Material particles behave like waves as is known from quantum mechanics. The wave-nature of particles actually dates back to de Broglie's hypothesis as well as Davisson and Germer's experiments. An Arago spot of electrons, which also constitute matter waves, can be observed in transmission electron microscopes when examining circular structures of a certain size. The observation of an Arago spot with large molecules, and thus proving their wave-nature is a topic of current research.
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