New method for invisibility
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Pekka Alitalo, soon to be Doctor of Science from Helsinki University of Technology, has discovered a new way for making objects invisible. His dissertation for the degree has a complicated name (Microwave Transmission-Line Networks for Backward-Wave Media and Reduction of Scattering), but the basic idea sounds quite simple.
For objects to be visible to human eye, they are reflecting and scatteing the electromagnetic field that is all around us. Previously, an object could have been made transparent by directing that electromagnetic field towards the object so that they would bend around the object, and re-unit behind it. But, Dr Alitalo's invention makes it possible to direct thid electromagnetic radiation through an object, making the object totally invisible to our eyes.
For objects to be visible to human eye, they are reflecting and scatteing the electromagnetic field that is all around us. Previously, an object could have been made transparent by directing that electromagnetic field towards the object so that they would bend around the object, and re-unit behind it. But, Dr Alitalo's invention makes it possible to direct thid electromagnetic radiation through an object, making the object totally invisible to our eyes.
From the news release:
In his dissertation, Pekka Alitalo, M.Sc. (Eng.), developed a new method to make objects invisible. The method is based on transmission-line networks, which can transfer electromagnetic radiation through, for example, a metallic mesh-like object. There has been no previous research from this viewpoint on transparency, i.e. electromagnetic cloaking, as it is called. The idea can be applied to many different practical problems; when compared with other scientifically proved "invisibility techniques", this technique works in a comparatively wide frequency range and can be used with transmission-line structures that are easy to manufacture.
Unfortunately there wasn't any fancy photographs available from his study yet, but here are a couple of examples produced by the older method.
Example of cloaking, image from gnews, an older story not related to Dr. Alitalo's new method.
Another invisible cloaking example, image from spacemart, and older story not related to Dr. Alitalo's new method.
In his dissertation, Pekka Alitalo, M.Sc. (Eng.), developed a new method to make objects invisible. The method is based on transmission-line networks, which can transfer electromagnetic radiation through, for example, a metallic mesh-like object. There has been no previous research from this viewpoint on transparency, i.e. electromagnetic cloaking, as it is called. The idea can be applied to many different practical problems; when compared with other scientifically proved "invisibility techniques", this technique works in a comparatively wide frequency range and can be used with transmission-line structures that are easy to manufacture.
Unfortunately there wasn't any fancy photographs available from his study yet, but here are a couple of examples produced by the older method.
Example of cloaking, image from gnews, an older story not related to Dr. Alitalo's new method.
Another invisible cloaking example, image from spacemart, and older story not related to Dr. Alitalo's new method.
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