Visible light band biological invisible device introduction

With cloaks, one can walk freely without being noticed. This is how much pleasure it is. A cat and a goldfish "enjoy" a cloak in advance of humans. Recently, Prof. Chen Hongsheng of the Institute of International Electromagnetics, Zhejiang University announced the latest developments. They cooperated with the research team of Nanyang Technological University, Professor Zhang Baile and other researchers, and used glass to manufacture visible invisible light devices.

Experiments have shown that a kitten lying in a hexagonal stealth device, at a certain angle, can directly bypass the kitten and return to the original path.

In order to explore the adaptability of the invisibility cloak to different life environments, the research group has also developed a set of devices suitable for underwater invisibility: goldfish swim into this “invisibility cloak” and objects behind it are still in view. "This means that stealth devices can not only hide large objects like cats and fish, but creatures can also work with stealth devices, and the stealth effect will not be affected," said Chen Hongsheng.

In 2012, Chen Hongsheng's research group developed a cylindrical stealth device using a birefringent crystal that exists in nature to achieve the invisibility of a thick object. "But the scale of this material is very small, and it can only be invisible to a polarized light, and it cannot be prepared on a large scale. We need to further study the materials and methods that are applicable to large-scale devices." Sheng Bin said.

In 2013, through further theoretical analysis, the research team optimized the parameters of the stealth device and selected a glass that can be prepared on a large scale in the industry as a material for invisibility clothing, and expanded the "size" of the invisibility clothing to the diameter. More than meters, and can be hidden in any polarized natural light. Experiments have shown that a kitten lying in a hexagonal stealth device, at a certain angle, can directly bypass the kitten and return to the original path. In order to explore the adaptability of the invisibility cloak to different life environments, the research group has also developed a set of devices suitable for underwater invisibility: goldfish swim into this “invisibility cloak” and objects behind it are still in view. "This means that stealth devices can not only hide objects such as cats and fish, but creatures can also work with stealth devices, and the stealth effect will not be affected," said Chen Hongsheng.

Up to now, this visible light band stealth device can only achieve an ideal stealth effect at a specific angle, such as the hexagonal stealth device has a good effect on the angle of six corners, and only two polygonal stealth device Angle can achieve stealth. Chen Hongsheng said that this stealth device will be expected to play a role in security, entertainment and surveillance applications. In the next step, the team will focus on improving stealth performance, such as increasing the stealth angle and reducing the weight of the device.

Chen Hongsheng said that this stealth device will be expected to play a role in security, entertainment and surveillance applications. In the next step, the team will focus on improving stealth performance, such as increasing the stealth angle and reducing the weight of the device. According to reports, the current progress in experimental research on stealth devices can be mainly classified into two categories: one is a carpet-based stealth device; the other is a Harry Potter-type invisibility cloak that is generally understood by people and can be moved off the ground. Such stealth clothing Requires light to bypass the middle invisible area, the parameters are more demanding. The work of Professor Chen Hongsheng belongs to the above-mentioned second type of stealth device.