At present, functional fabrics are very popular among consumers. When people mention this kind of fabric, the first thing that people think of is moisture absorption and quick drying. Maybe in the near future, functional fabrics will add a new feature: invisibility.
Sudden appearance and sudden disappearance may not be difficult to achieve in a movie with the help of special effects, but in reality, this kind of thing is unbelievable. Not long ago, the research results completed by the team of Professor Chen Hongsheng of the Department of Information and Telecommunications of Zhejiang University on “Invisibility of large objects in the visible light band – the mechanism of electromagnetic wave ‘invisibility cloak'” were published in the authoritative scientific journal “Nature Communications”.
Control the light path to achieve invisibility
The “invisibility cloak” developed by the team is currently a hexagonal column with each side about 5 centimeters, surrounded by ordinary organic glass, and the core “invisibility channel” is composed of special optical glass.
And this “invisibility cloak” is different from the invisibility principle of the invisible aircraft we are familiar with in reality. Dr. Zheng Bin told reporters that it can “control” the path of light – once it encounters a cloaking device, the light will naturally detour, and people will not be able to see objects in the device area.
Traditional stealth aircraft use special coatings and fuselage structures to prevent the reflection of radar waves to achieve the purpose of invisibility. The results of Chen Hongsheng’s team have greatly reduced the design and implementation difficulty of the invisibility cloak. This invisibility cloak can not only avoid being detected by radar Even if it is discovered, it can also escape the search of the naked eye.
Zheng Bin explained: “To be invisible, the light entering the invisibility cloak must run faster than the external light.”
In the experiment of this research group, a kitten squats in a hexagonal cloaking device. At a certain angle, the light can directly bypass the kitten and return to the original path, resulting in the kitten’s “invisibility”. “The effect. In order to explore the adaptability of the invisibility cloak to different life environments, the research team also developed a set of devices suitable for invisibility in water: when a goldfish swims into this “invisibility cloak”, the objects behind it can still be seen clearly.
“This means that the stealth device can not only hide large objects and creatures like cats and fish, but can also move with the stealth device, and the stealth effect will not be affected.” Chen Hongsheng said.
Chen Hongsheng said that to study “invisibility”, we must first understand why objects “appear”: when electromagnetic waves are irradiated onto an object, they will be scattered on the object. The scattered electromagnetic waves are received by “sensors” such as the human eye, and the presence of objects there can be identified.
Extended reading: https://www.yingjietex.com/product /1600D-Polyester-DOBBY-YARN-OXFORD-Fabric.html
Extended reading:https://www.yingjietex.com/product/Full-dull-Nylon-dobby-checked-taffeta-Fabric.html
Extended reading:https://www.yingjietex.com/product/300D-Polyester-OXFORD-Fabric.html
Extended reading:https://www.china-fire-retardant.com/post/9377.html
Extended reading: https://www.alltextile.cn/product/product-19 -640.htm
