According to the report of the physicist's organization on March 28th, researchers at the University of California, Santa Barbara, directed high- and low-frequency laser beams at semiconductors, causing electrons to escape from the core and accelerate, and then returned to collide with the core. Multiple frequency lights. The results of relevant studies are published in the latest issue of Nature.
When a high-frequency laser beam hits a semiconductor material such as a gallium arsenide nanostructure, it creates a pair of electron-hole (hole) complexes called excitons. When electrons get energy from the outside, they jump to A high energy level, but not stable, will soon release the energy obtained and return to the original energy level; but if the energy obtained by the electrons is high enough, they can get rid of the bondage of the nuclei into free electrons, and the electrons are free. The position is called hole, free electrons may lose energy due to friction or collision and other factors, and finally they are recombined by the attraction of holes.
The coauthor of the paper, a professor of physics at the school and Mark Shewin, director of the Terahertz Institute of Science and Technology, said: "High-frequency lasers generate electron-hole pairs. Strong low-frequency free electron laser beams separate and accelerate electrons from the hole. At this time, because the electron acceleration has excess energy, it will violently collide with holes, recombine electron-hole pairs, and emit new frequency photons. In a fairly regular path, the hybrid laser beam collides with one or two new Frequency, and we saw in experiments that all these different new frequencies can reach 11 at most, this phenomenon is really exciting.â€
Sherwin said that because the light of each frequency corresponds to different colors, the reason why they can achieve such a breakthrough is to rely on a special tool - a free electron laser. Its greatest feature is that it can detect the basic properties of the material, and will It can measure the color of different light before it is placed in the mixed beam, thereby finding light of various frequencies.
The paper's first author, Ph.D. student of the school's Physics Department, Ben Zax explained: "It's like a cable network. Its cable is a bundle of fibers, and you send a beam of about 1.5 micron wavelength along this line, but In this beam of light there are many frequencies separated like fine comb gaps, the information will move at a frequency, and the use of this technique can increase the frequency of many messages that can be transmitted without being too far apart from each other. ."
The research team established a machine that generates electron-hole collisions. In reality, it may not have practical applications. However, in theory, a transistor can be used to generate a strong terahertz field with a free electron laser, and it can also adjust adjacent infrared beams. The data shows that the instrument modulates near-infrared laser light at twice the terahertz frequency. When the speed of light modulation is increased, the information received from the cable will be transmitted faster.
The researchers said that applying the electron-hole recurrence phenomenon to the real world has the potential to significantly increase the data transmission and communication speed of the optical cable. The most likely application is a multiplexing technique that sends data over multiple channels; another one can modulate light at high speeds. (Hua Ling)
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