According to the British magazine "New Scientist", scientists have for the first time built artificial electromagnetic "black holes" that can absorb ambient light. The device can absorb solar energy and can be converted into heat or electricity used by people.
This artificial black hole works at microwave frequencies and will soon absorb visible light, a new way to harvest solar energy. Earlier this year, Evgenii Narimanov and Alexander Kildishev of Urdu University in India published a study in the media magazine on how to build a desktop that absorbs light. The theory of black holes. This artificial black hole simulates a black hole in the universe. Its strong gravity can bend the surrounding space and time, causing any matter or radiation around it to follow the distorted time and space, and the spiral is absorbed inward.
According to Narimanov and Kirdishevi, this artificial black hole allows light to be bent and absorbed into the center of the device. The artificial black hole they designed is a cylindrical structure consisting of a central column containing a coaxial ring shell. The key factor that causes the light to bend inward is the dielectric constant of the coaxial ring shell, which affects the electrical composition of the electromagnetic wave and increases the smoothness from the outside to the inner surface, which is similar to the curvature of time and space close to the black hole. When the coaxial ring shell is in contact with the center post, the dielectric constant of the coaxial ring must match the center post, so the light can be absorbed rather than reflected.
At present, Cui Tiejun and Chen Qiang, scientists at Southeast University in Nanjing, China, applied the theory of Naraymanovic and Kirdishevi to practice a "man-made black hole" with a microwave frequency. The device uses a "super material". Constructed as 60 coaxial rings, it is reported that super materials have been used to make stealth cloaks.
Each of the coaxial loops is formed in the form of a circuit board of a different structure, and the coaxial loops are connected to each other, so that the dielectric constant is very smooth. The outer 40 coaxial rings form the outer casing, and the inner 20 coaxial rings constitute the absorber. Cui Tiejun said: "When the incident electromagnetic wave hits the device, the electromagnetic wave will be induced into the inner coaxial ring and then absorbed. The coaxial ring will convert the absorbed light into heat."
Narimanova is very appreciative of the artificial black holes built by two Chinese scientists. He said: "I am very surprised that they can build artificial black holes so quickly!"
This artificial black hole is not easy to capture light waves in the same way, and the visible light wavelength is much smaller than the microwave radiation. This requires the coaxial ring to be constructed to be smaller accordingly. Cui Tiejun is full of confidence in the artificial black hole they built. He said: "I expect this optical black hole to be widely used at the end of 2009."
Artificial black holes like this can be used to collect solar energy, especially for solar mirrors that are too diffuse and difficult to collect on solar cells. Optical artificial black holes are able to completely absorb these light and directly convert the solar cells absorbed on the coaxial ring. Naraymanovic said: "If this equipment works effectively, then parabolic mirrors will no longer be needed to collect the sun's rays."
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