“Invisible Cloak” Or A Reality? Scientists Claim To Find Alternatives To Expensive Metamaterials


Invisible devices may soon cease to be part of science fiction. A new study published in De Gruyter magazine Nanophotonics by researchers Huanyang Chen and Qiaoliang Bao from Xiamen University in China shows that molybdenum trioxide (a-MoO3) materials can be used in emerging new optical device technologies. Replace expensive and difficult to produce metamaterials.

The idea of an invisible cloak may sound more like magic than science, but researchers are currently working to produce devices that can scatter and bend light in such a way to produce an invisible effect.

Up to now, these devices have relied on metamaterials–a specially designed material that has new properties that are not found in naturally occurring substances or individual particles of the material–but Chen and their research recommend using them. a-MoO3 to make these invisible devices.

This material with some unique properties can provide a good platform for controlling energy flow. The team’s simulation results show that when cylindrical or rolled a-MoO3 materials replace metamaterials, the simplified invisible concentrator can obtain electromagnetic invisibility and energy concentration effects, which will be shown by a nearly perfect invisible device. Effect.

Therefore, this study shows that hyperbolic materials such as a-MoO3 and vanadium pentoxide (V2O5) can be used as a new basis for transformation optics and provide the possibility for photonic devices other than invisible concentrators-including improved infrared imaging And detection system.

In recent decades, transformation optics has been a hot topic in physics, thanks to the discovery that the path of light in a continuous medium can be the same as its propagation in a curved space that has undergone a coordinate transformation.

The result of this is that when light passes through a material, its behavior can be manipulated, which can also lead to the creation of many new optical devices, such as invisible cloaks-a kind of light that can cover an object and make it around The camouflage material that bends so that it almost disappears–and other optical illusion devices.

“This is the first time that two-dimensional materials have been used in transformation optics. Normally, we need metamaterials, but this is much simpler,” Chen said. The researcher went on to explain that the first application of the results of this study may be a large-scale energy concentrator that can improve such devices.