Using a type of glass that does not conduct electricity, researchers at
Michigan Tech and Penn State report discovering a way to capture and
route rays of visible light around objects, rendering the objects
invisible.
Previous attempts to build an "invisibility cloak" have used metals and
wires. In the research by Michigan Tech engineer Elena Semouchkina and
colleagues, tiny glass metamaterials were arranged in a cylinder shape
that produced the magnetic resonance required to bend light waves
around an object. These resonators are artificial materials with
properties that do not exist in nature, born of the marriage between
materials science and electrical engineering.
The researchers are experimenting with other materials, such as ceramic
resonators, and with other frequencies, such as microwave. The goal is
to find applications that work at visible light frequencies, says
Semouchkina.
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