| Title | Research Progress of Ultra-High Density Optical Storage |
|---|---|
| ID_Doc | 33489 |
| Authors | Hao, R; Qiao, H; Miao, Z |
| Title | Research Progress of Ultra-High Density Optical Storage |
| Year | 2024 |
| Published | Chinese Journal Of Lasers-Zhongguo Jiguang, 51.0, 11 |
| Abstract | Significance With the development of technologies such as artificial intelligence, the metaverse, the digital economy, and quantum computing, global data production is growing dramatically, and the amount of stored information has rapidly jumped from the PB level to the EB level or even the ZB level in extreme cases. According to statistics and predictions from the Statista, the total amount of data generated globally will grow at an annual rate of 27% from 2020 to 2025, and it is expected to reach 2142 ZB by 2035. But major storage devices, such as solid - state drives, hard drives, and magnetic tapes, generally face issues of high energy consumption and short operating lives. Additionally, costs increase sharply with time migration, and there is a risk of data loss. In comparison, optical storage technology is more durable, reliable, and energy - efficient, and it presents a promising green solution for long - term data storage. However, the density of traditional optical storage technology is limited by diffraction, making it difficult to meet the storage requirements of massive data. In order to improve storage density, methods commonly used are shortening the laser wavelength and increasing the numerical aperture (NA) of the objective lens to reduce the size of the recording spot, as demonstrated by the development from CD to BD. By using a recording wavelength of 405 nm and an objective lens with an NA of 0.85, a single BD can achieve a maximum capacity of 500 GB and a storage density of approximately 49.1 Gbit/inch(2) . Wavelengths below 400 nm result in high costs, while increasing NA reduces the working distance, which will easily damage the lens and optical disc. Therefore, it is necessary to develop new technologies to achieve ultra - high density optical storage. In recent decades, researchers have continuously explored innovative mechanisms for optical storage. By introducing parameters such as 3D space, polarization, and wavelength for multiple information reuse, storage space can be further utilized. In addition, with the development of nanotechnology, superresolution nanoscale optical storage can be achieved by breaking through the diffraction limit. Although significant progress has been made, there are still a series of challenges in practical application and industrialization. Therefore, it is important and necessary to summarize existing research in order to better prospect future development in the field of big data optical storage. Progress We review the research progress of ultra - high density optical storage over the past 20 years. First, the principle and the storage density enhancement ability of multiplexing optical storage in different dimensions are introduced, including 3D space, polarization, wavelength, and orbital angular momentum. Second, we summarize the existing superresolution optical storage technologies. Figure 5 shows that dual - beam superresolution optical storage technology has the potential for ultra - high capacity. Then, we discuss the problems faced by technology and ongoing research trends. In the end, we demonstrate the latest research progress of our research group in this field. Combining the dual - beam superresolution optical storage technology with the AIE effect, the equivalent capacity of a single disc is increased to 1 Pb. Conclusions and Prospects Multidimensional information multiplexing technology and superresolution optical storage technology have effectively improved storage density to provide green, cost - effective solutions for long - term information storage in the era of big data. With the continuous deepening and improvement of the light-matter interaction at the sub - wavelength scale, exploring the combination of the above two technologies will be a future direction. Furthermore, the realization of dual - beam superresolution optical storage technology with ultra - fast recording speed and ultra - high recording precision will offer new opportunities for the innovation of ultra - high density data storage systems. |
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