Based on the cylindrical mirror grating, academicians of the Chinese Academy of Sciences demonstrate the "invisibility" realized by special materials.

Thanks to CTOnews.com netizen Xiao Zhan for the clue delivery! CTOnews.com news on October 30, during bilibili's "bilibili Super Science Night" held on October 28, Chu Junhao, academician of the Chinese Academy of Sciences, demonstrated "invisibility" realized by using special materials on the spot.

Academician Chu Junhao asked the staff to hold a seemingly transparent panel. At first, the lower body of the character could be seen through the panel, but after rotating the material 90 °, the lower body of Academician Chu Junhao "disappeared." and can clearly see the stage scene behind the character. (see 6:40 in the video for details)

Academician Chu Junhao said that there are many "invisibility techniques" in real life and the natural animal kingdom, but we can responsibly tell everyone that this is a scientific means rather than a "magic".

According to reports, the material to achieve the above "stealthy" effect is a cylindrical lens grating, which is composed of rows of tiny cylindrical convex lenses, each of which compresses the object behind it into a thin strip, so that the light can be refracted regularly. When there are enough lenses, the object will be broken down into countless identical strips, thus creating a visual "vanishing" effect.

In addition, Academician Chu Junhao also showed other ways of stealth, including the use of two substances with similar refractive index, plane mirror reflection imaging, and so on.

CTOnews.com Note: Chu Junhao is a researcher at the Shanghai Institute of Technical Physics, Chinese Academy of Sciences, president of the Institute of Optoelectronics of Fudan University, and an academician of the Chinese Academy of Sciences.