US and Chinese scientists have jointly developed the world's smallest semiconductor laser. The research, called Surface Plasma Laser Technology, is a milestone in the field of laser physics. It was published in Nature on August 30th. The research team led by Zhang Xiang, a Chinese professor at the University of California at Berkeley, Beijing. Professor Dalen University and his doctoral student Ma Renmin completed the project.
Two years ago, Zhang Xiang's research team began working with Professor Dylan to use cadmium sulfide nanowires developed by Dailun et al., which is 1,000 times thinner than human hair. Zhang Xiang separates the nanowires from the silver metal. There is only a deep sub-wavelength of 5 nanometers of insulation gap between them. In this space 20 times smaller than the vacuum wavelength, laser light is generated, because the laser is stored in large quantities in this non-metal. In the narrow gap, the possibility of light loss is greatly reduced.
Professor Zhang Xiang, who was once included in the 2008 Top Ten Scientific Discoveries by Time magazine in the United States, said that the research broke the traditional concept of laser limits. Once the light can be concentrated into the range of only one-tenth of the hair, laser radiation is achieved. 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 electron wavelength, photon and Electronics can truly interact in the future.
Zhang Xiang said that this technology will not only achieve major breakthroughs in basic scientific research, but also have a profound impact on applied sciences such as biomedicine, communications and computers. “In biomedical science, scientists can detect DNA and cancer in molecular size. For communication and computer technology, it can help achieve higher density optical or magnetic information storage.â€
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