Illustration of electron refraction across a potential step. A change in potential causes an abrupt shift in the trajectory of the spin-polarised ballistic electrons, emulating the refraction of light ...
The focusing of ultrasound using topographic lenses, typically made of plates with step changes that cause an interaction between forward- and backward-propagating guided waves, has been widely ...
Scientists have demonstrated that negative refraction can be achieved using atomic arrays -- without the need for artificially manufactured metamaterials. Scientists have long sought to control light ...
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