The reason why human eyes can see things is mainly due to the reflection of light. Objects of different colors and densities have different absorption wavelengths of light. In human eyes, they have become various objects. Even transparent water or glass is not completely invisible, but the refractive index is relatively close to the air. So theoretically, as long as people can be completely transparent and have the same refractive index as the surrounding medium to light, they can achieve invisibility.
As early as 2004, a professor at the University of Tokyo in Japan invented a "invisible coat". As long as people wear this "invisible coat", passers-by will find it difficult to identify where the real person is. Of course, this is not Invisibility in the true sense can only be said to be the realization of visual disguise. The reason is to apply retroreflective substances on the clothes and install them on the camera. In 2013, professors from Zhejiang University in China also invented a device with invisibility. The professor put a pencil into the device. As a result, something magical happened. People found that the part in the middle of the pencil was missing, which is also Invisibility in a certain sense.
In 2006, scientists invented a two-dimensional stealth cloak . The material of this cloak is mainly metal, ceramic and fiber synthetics. After these special circuit board materials are mixed, they can absorb some specific bands of the wave Optical fiber, using the optical principle to realize the illusion of "invisibility".
Hyperstealth Biotechnology corp. developed this space suit in 2012, which is said to use high-tech "quantum camouflage fabric". Let's take a look at the magic of this quantum stealth server, as shown in the figure below.
What is the mechanism behind such a stunning stealth effect? Unfortunately, the company's CEO Guy. Cramer declined to disclose any details on the grounds of confidentiality, but said both the U.S. and Canadian military were interested in the product and expressed the possibility of in-depth cooperation with them.
Now, seven years have passed. Generally speaking, the quantum stealth cloak has been developed for so long, and the related technologies should be very mature, and the corresponding products should have been on the market long ago. It turns out that there is still no news about this magical product, so while we can't absolutely treat Canada's quantum stealth cape as a scam, we can definitely question its authenticity based on existing facts. However, just last year, there was rumor that a Chinese research unit successfully developed a quantum stealth cloak.
A big man with a smile disappeared like that. Very high-tech. Unfortunately, the clever netizen quickly saw through the trick because there was some subtle flash of light on the man's "invisible cloth" that was obviously used as a positioning point for post-production. This technology is commonly known as " green screen ". This technology is used in the production of many movies, giving the audience a realistic image through post-composition.
It is worth mentioning that the questioned research unit also issued a statement saying that this kind of thing does not exist, so the quantum invisible clothing must be fake. The fundamental reason why we can see an object is that the object blocks the light, causing light to reflect , scatter, diffraction, etc. so that we can detect them. If we can let light bypass our bodies, it is invisibility.
We have evidence to observe that when light passes through the strong gravitational field , it will be noticeably bent. According to this principle, if we can create a strong enough force field, we can distort the light close to our body, thus bypassing our body, thereby achieving invisibility. However, the material that can produce such a force field (and, the key is, it is light enough to wear like a clothing) cannot provide at all.
can achieve a certain degree of invisibility by using a medium that can cause light to produce a specific refractive effect, but the disadvantage of this method is that it can only be achieved under specific conditions.Light is actually an electromagnetic wave , so our idea is to change the refractive index of a specific material surface at the microscopic level so that it neither reflects nor absorbs light, thereby achieving the purpose of stealth. Scientists have now made materials that are "invisible" to certain electromagnetic wavelengths. But researchers say there is still a long way to go from invisible light...
