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Generation of orbital angular momentum hologram using a modified U-net |
| Zhi-Gang Zheng(郑志刚)1, Fei-Fei Han(韩菲菲)1, Le Wang(王乐)1, and Sheng-Mei Zhao(赵生妹)1,2,3,† |
1 Institute of Signal Processing and Transmission, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;
2 Key Laboratory of Broadband Wireless Communication and Sensor Network Technology (Ministry of Education), Nanjing University of Posts and Telecommunications, Nanjing 210003, China;
3 National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China |
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Abstract Orbital angular momentum (OAM) holography has become a promising technique in information encryption, data storage and opto-electronic computing, owing to the infinite topological charge of one single OAM mode and the orthogonality of different OAM modes. In this paper, we propose a novel OAM hologram generation method based on a densely connected U-net (DCU), where the densely connected convolution blocks (DCB) replace the convolution blocks of the U-net. Importantly, the reconstruction process of the OAM hologram is integrated into DCU as its output layer, so as to eliminate the requirement to prepare training data for the OAM hologram, which is required by conventional neural networks through an iterative algorithm. The experimental and simulation results show that the OAM hologram can rapidly be generated with the well-trained DCU, and the reconstructed image's quality from the generated OAM hologram is significantly improved in comparison with those from the Gerchberg-Saxton generation method, the Gerchberg-Saxton based generation method and the U-net method. In addition, a 10-bit OAM multiplexing hologram scheme is numerically demonstrated to have a high capacity with OAM hologram.
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Received: 29 October 2023
Revised: 04 December 2023
Accepted manuscript online: 06 December 2023
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PACS:
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42.40.-i
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(Holography)
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42.50.Tx
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(Optical angular momentum and its quantum aspects)
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42.79.Sz
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(Optical communication systems, multiplexers, and demultiplexers?)
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84.35.+i
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(Neural networks)
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| Fund: This work was supported by the National Natural Science Foundation of China (Grant Nos. 62375140 and 61871234) and the Open Research Fund of National Laboratory of Solid State Microstructures (Grant No. M36055). |
Corresponding Authors:
Sheng-Mei Zhao
E-mail: zhaosm@njupt.edu.cn
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Cite this article:
Zhi-Gang Zheng(郑志刚), Fei-Fei Han(韩菲菲), Le Wang(王乐), and Sheng-Mei Zhao(赵生妹) Generation of orbital angular momentum hologram using a modified U-net 2024 Chin. Phys. B 33 034207
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