Scientists at Southeast University in Nanjing have developed a “nearly perfect” cloaking device for hiding DC current, a building block toward optical invisibility. The DC cloak is also ultrathin — only 1 cm thick, which is the absolute limit for thinness of this type of practical demonstration. It is a network of resistors, common parts of electrical circuits that are used to reduce voltage, which act in this case as a type of metamaterial, an artificial material that exhibits properties such as bending current or electromagnetic waves, including visible light.
The cloak in this case does not affect visible light, instead just hides the static fields produced by direct current and magnetic fields.
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