According to the report of the British New Scientist website on October 16 (Beijing time), German scientists use some fiber optic rings, which seem to have a "negative mass" of light pulses, allowing laser pulses to self-accelerate around them. Scientists point out that the latest research appears to be inconsistent with Newton's third law, but it is only an illusion. Its significance is that researchers can use this to develop faster electronic devices and more reliable communications equipment. Newton's third law states that the force and reaction force between two objects are always on the same line at the same time, equal in size and opposite in direction. When two balls collide, they bounce back. But if the quality of a ball is negative, when they meet, they will accelerate in the same direction. This effect is very useful in "backdrivers." "Reverse drives" are devices that scientists conceived, in which positive and negative masses interact and then accelerate forever. In the 1990s, NASA tried to make such a driver to provide better boost for rocket launch. However, quantum mechanics claims that it is impossible for a substance to have negative mass, even if the mass of antimatter is also positive. Now Ulve Pescher and colleagues at the University of Nuremberg, Germany, use "equivalent quality" to create a "reverse drive." They explain that when photons travel at the speed of light, they do not have a resting mass, but if a light pulse shines on a laminated object such as a crystal, some of the photons will be reflected back by one layer of the crystal and then reflected back by the other layer. This will cause some of the pulses to be delayed, causing it to interfere with the rest of the pulses, and the speed through the material will therefore become slower. In this way, the light pulse seems to have a quality - "equivalent quality." Depending on the shape of the light wave and the structure of the crystal, the light pulse can have a negative equivalent mass. In order to get such a pulse to interact with a pulse of positive mass, a very long crystal is needed in order to absorb the light before the two pulses show a reverse thrust effect. For this reason, Pescher made a series of laser pulses in two fiber rings. These pulses will “participate†at some point between the two rings, and the light will move around each fiber ring in the same direction. The key is that one ring is slightly longer than the other, so the light moving around the longer ring is relatively delayed. When this pulse is reflected back and split at the connection point, it shares part of the photons with the pulse in the other ring. After such a few trips, the pulse develops an interference pattern that gives the pulse a negative mass. Pescher said that electrons in semiconductors can also have "equivalent quality". Therefore, these rings can be used to accelerate electrons and improve the processing power of computers. Moreover, in some optical fibers, the speed of the light pulse is equivalent to its wavelength, which means that this ring can be used to control the color of the light output from the fiber. This method is also expected to increase the bandwidth of photonic communications and help create display devices such as laser display screens. However, it is not easy to use this ring in real life. (Reporter Liu Xia)
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German scientists make reverse drive light pulses with "negative quality"