Professor Hua Yuan has developed the world's smallest semiconductor laser. US and Chinese scientists have jointly developed the world's smallest semiconductor laser. This research called "surface plasma laser technology" is a milestone in the field of laser physics. It was published in the "Nature" magazine on August 30. The research team led by Zhang Xiang, a Chinese professor at the University of California, Berkeley, Professor Dai Lun of Peking University and his PhD student Ma Renmin jointly completed it. Two years ago, Zhang Xiang ’s research team began to work with Professor Dai Lun to use cadmium sulfide nanowires developed by Dai Lun and others, which are a thousand times thinner than human hair. Zhang Xiang separated the nanowire from the silver metal, and there was only an insulating gap of five nanometers deep in the sub-wavelength. The laser exited in this space, which was 20 times smaller than the vacuum wavelength. The narrow gap in the metal greatly reduces the possibility of light loss. Professor Zhang Xiang, who was included in the top ten scientific discoveries in 2008 by Time magazine in the United States for the development of stealth technology, said in an interview with China News Service on the 31st that this research result has broken the traditional concept of laser limits. For the first time, humans can focus light to a range of only one ten thousandth of the hair and realize laser emission. For the first time, surface plasmon laser technology is realized. This size is only equivalent to the size of a single protein molecule, which is very close to the electronic wavelength. Photons and electrons can truly interact in the future. What impact will this technology have on humans? Zhang Xiang said that this technology will not only achieve a major breakthrough in basic scientific research, but also have a profound impact on applied sciences such as biomedicine, communications and computers. "In terms of biomedicine, scientists can detect DNA and cancer at the molecular size. And for communication and computer technology, it can help achieve higher density storage of optical or magnetic information." From this we can believe that in the near future In the future, a CD-ROM can store the volume of books in a library. Zhang Xiang completed his bachelor's and master's degrees in the Department of Physics of Nanjing University. He received his doctorate from the University of California, Berkeley in 1996. He taught at Pennsylvania State University and the University of California, Los Angeles, and returned to Berkeley in 2004. He is currently the lecturer professor of Ernster S? Kur and the director of the National Center for Nanoscience and Engineering Research. The research team led by him developed the stealth material technology in August last year, making it possible for people to make stealth clothes to realize the dream of true stealth.
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