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Chinese scholars have made progress in the multiplexing of multi-dimensional optical orbital angular momentum information

 Last Update: 2021-11-14
 Source: Internet
 Author: User

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conversion technology

frequency violet light

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With funding from the National Natural Science Foundation of China (approval numbers: 61522504, 91750110), etc.

, a joint research team composed of Professor Li Xiangping of Jinan University, Professor Xu Yi of Guangdong University of Technology, and Academician Gu Min of the University of Shanghai for Science and Technology Progress has been made in the reuse of momentum information

Compared with electrical signals, optical information technology using photons as information transmission carriers has the advantages of large bandwidth, low energy consumption, and high parallelism
.

By adjusting the polarization, amplitude, phase and frequency of light waves, the interaction between light waves and matter can be manipulated, providing more freedom for large-capacity information technology

Focusing on the above-mentioned problems, Professor Li Xiangping and his cooperative team have revealed the physical phenomenon of Helical Dichroism (HD) caused by the topological charge of the OAM light field to cause the difference in particle absorption
.

They found that under non-paraxial focusing conditions, OAM light produces polarization ellipses with different spatial orientations and distributions in the focal spot volume due to the depolarization effect

The research results show that, as a theoretically infinite physical dimension, OAM multiplexing can play an important role in the fields of nano-scale optical information multiplexing and regulation
.

This work opens up a new way to develop the OAM dimension of light to control the interaction between light and matter, and its mechanism can also be extended to other related optical systems, such as OAM-based high-dimensional quantum entanglement, large-capacity information storage, and optical encryption applications.

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