according to the daily telegraph, scientists have recently made a invisibility cloak from silk. Although this invisibility cloak can only work in the spectral range between radio waves and infrared rays outside the visible light, its researchers, scientists from Boston University and Tufts University believe that through the improvement, the invisibility cloak can only work in the spectral range between radio waves and infrared rays, 1t could work in a shorter range of light waves, even visible light
researchers hope that this material not only has medical application value, but also makes it possible for people or objects to be invisible. The “metamaterial” is made of silk covered with a layer of metal, and each tiny helix is a “split ring resonator.”. Split ring resonators have a unique effect on light: they can absorb or reflect light within a specific wavelength range, or bend light to make them bypass the surface of the object. There are 10000 split ring resonators per square centimeter of silk metamaterial
generally, terahertz wave can pass through silk without any influence. However, when THz waves come into contact with this new type of metal silk, the latter will produce resonance. Because silk has biocompatibility, it will not cause immune rejection after implanted into human body, so this kind of metal silk can be widely used in medical field. “This is a unique perspective for metamaterials, because silk has the ability to be compatible with the human body,” said fiorentz Omenetto, a researcher at Tufts University
the researchers said that the use of this material to make Harry Potter type invisibility cloak is only one aspect, and only when it is applied to the medical field can it give full play to its maximum value. Radiation researchers can use this material to cover the organ, so that they can better see the blocked part of the organ. Diabetics can also use it as a blood glucose sensor: when blood glucose levels change, the metamaterial changes accordingly. This change can be sent out in the form of radio waves, and it can be found by mobile phones
last year, researchers from the Royal College of the University of London and the University of Southampton received 4.9 million pounds (51.9838 million RMB) funding and permission to study the metamaterials and their applications in the fields of medicine, defense, security and communication