According to foreign media reports, the invisibility cloak in "Harry Potter" left a deep impression on the audience. The development of this magical device has become the "Holy Grail" in the eyes of physicists. Invisible cloaks developed by many physicists can only temporarily let objects disappear or make the sound invisible.
The United States develops advanced invisibility cloaks that allow the entire event to be shaped
Now, a research team at Purdue University in the United States has developed an invisibility cloak that can shape the entire event. By hiding the event with a laser beam, the researchers let events, such as moving an object from one location to another, appear to enter a "time bubble" to achieve an invisible effect.
The stealth technology developed by Purdue University in the United States is called "time cloak", which uses laser and fiber to achieve invisible purposes. The findings were published in the Optics InfoBase Optical Journal. The researchers first split the frequency of the beams and then change their height.
After that, they let the beam pass through a cable. By delaying the photon velocity of a particular beam, the intensity of the light drops to zero, allowing the beam—behind or between the other beams—to be invisible.
In this way, the speed of the light moving in front of the beam is increased, and the speed of the tail is slowed down to form a gap. The physicist then uses this gap to insert hidden information. The hidden information moves at other frequencies and reaches the other end, which is out of sync with the surrounding photons.
The United States develops advanced invisibility cloaks that allow the entire event to be shaped
This theory was proposed by scientists at the Imperial College of London University in 2010. The research team at Purdue University turned this theory into reality in 2013. In 2013, these experts successfully hid the data, but failed to retrieve the data, and the hidden data was eventually erased.
After that, they developed this technology. Their latest design marks the first step on the road to using this invisible device in the real world.
Researchers have upgraded the theory put forward by Imperial College scientists and are not limited to transmitting data. They hope to use this technology to make people-oriented events invisible. If the gap between the beams is large enough, one can pass through the gap without being noticed and then appear in another place.
For example, if a pedestrian is allowed to cross a road without disturbing traffic, the speed of the car that has not yet reached the intersection needs to slow down, and the car passing through the intersection needs to be accelerated. A slow and fast formation of a gap allows the walker to pass through, but the observer in the distance sees only a steady flow of traffic. That is to say, a time bubble is formed.
The United States develops advanced invisibility cloaks that allow the entire event to be shaped
In order to develop a large invisibility cloak, scientists need to develop an advanced system for physically segmenting the light frequencies and then manipulating them. The research team at Purdue University proved that the idea was feasible. In theory, changing the speed of multiple beams can create a series of gaps for hiding multiple groups of data.
Research leader Joseph Rukens said: "The whole process gives the illusion that no signal is sent, which improves security, because this invisibility does not seem to be manipulated. The eavesdropper does not realize that the signal is invisible. Because the surface does not appear to send any signals."
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