Recently, the research team led by Gu Min, academician of the Australian Academy of Science and the Australian Academy of Technical Sciences and Engineering, first used optical chips to realize the manipulation of photon angular momentum at the nanoscale. This is a major breakthrough in the field of optical information technology. The new photonic angular momentum coding technology is expected to be applied in various fields such as ultra-fast optical communication, ultra-high definition display, ultra-secure information encryption, ultra-efficient quantum communication and quantum computing. Relevant results online published in "science". Photons can carry angular momentum, including the angular momentum associated with circularly polarized light and the angular momentum of the orbit associated with the phase of the spiral. Due to the theoretically unlimited amount of photonic orbital angular momentum, it has drawn much attention in recent years in the fields of quantum communication and optical communication. However, information encoding and decoding photonic angular momentum at nanoscale has been a worldwide problem. Using specially designed nano-grooves and nanorings, the team pioneered new techniques for encoding, transmitting and decoding photon angular momentum modes at the nanoscale. "For the first time, manipulating a helical beam on a chip is achieved by the ingenious design of nanostructures on photonic chips." Gu Min said the chip converts photon angular momentum into surface plasmons by designing nano-grooves in the metal surface Angular momentum field distribution, and then use the annulus structure of the latter angular momentum mode to identify and selectively transmitted. The team introduced a specially designed optical chip that accurately transmits different photon angular momentum signals to different nanorings and lets them out, so the information is not lost. In addition, this invention can also increase the optical communication processing speed by an order of magnitude.
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Optical information technology has a major breakthrough