# Multiplexing Perfect Optical Vortex for Holographic Data Storage
## 5 Conclusions  
In conclusion, we have presented a novel approach for holographic data storage using the multiplexing of perfect optical vortex (POV). In our proposed method, the topological charge (\(\ell\)) of the POV serves as the label for different point-data pages, while the intensity levels of individual points within the data pages are utilized for data storage.  
Through our proof-of-principle experiments, we have demonstrated the successful reconstruction of point-data pages from the POV-multiplexing hologram when illuminated by the corresponding POV reading beam. The reconstructed images exhibit accurate representation of the stored data, and the information contained within can be easily extracted by setting appropriate intensity thresholds. One of the key advantages of our approach is the high storage density offered by POV. Compared to traditional optical vortex methods, POV enables the design of more storage cells within the same storage area. This results in improved storage capacity and allows for the storage of larger volumes of data in a single hologram. We have also conducted investigations into the impact of two important parameters, namely, axicon periods and multiplexing numbers, on the storage performance. The selection of these parameters plays a crucial role in achieving a balance between storage density and bit error rate (BER). By carefully optimizing these  
Figure 7: (**a**) The effect of varying the multiplexing number on the quality of the reconstructed data. (**b**) The effect of varying the multiplexing number on the storage capacity.  
parameters, we can achieve the desired storage density while minimizing data retrieval errors. Furthermore, our proposed method offers enhanced data security in holographic data storage. The selective nature of the POV reading beam, which is specific to the helical mode indexes, enhances the security of stored data and prevents unauthorized access.  
Our proposed multiplexing approach utilizing perfect optical vortex beams offers a valuable and practical solution for achieving high-density and secure holographic data storage systems. The increased storage density, coupled with the potential for improved data retrieval accuracy through parameter optimization, opens up new possibilities for advanced holographic data storage technologies. With further advancements and optimizations, the multiplexing of perfect optical vortex beams holds great promise for the development of next-generation holographic data storage systems.  
Conceptualization, J.Z. and F.Z.; methodology, J.Z. and L.W.; software, J.Z. and L.W.; validation, L.W.; writing--original draft preparation, J.Z.and F.Z.; writing--review and editing, J.Z., X.L., and S.Z.; supervision, X.L. and S.Z. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the National Natural Science Foundation of China (NSFC) (61871234, 62001249), the Natural Science Foundation of Suqian (K202209), the Aba Teachers University Project (AS-PYYB2023-02), the Open Research Fund of National Laboratory of Solid State Microstructures under Grant (36055), and the Natural Science Foundation of Jiangsu Province under Grant (BK20221411).  
Not applicable.  
The data related to the paper are available from the corresponding authors upon reasonable request.  
The authors declare no conflicts of interest.