Parallel writing of 5D optical data via shaped voxels

Area of Science:

• Optics and Photonics
• Materials Science
• Data Storage Technologies

Background:

• Multidimensional optical data storage is essential for managing the exponential growth of digital data.
• Conventional methods for optical data writing suffer from low data rates due to serial processing.
• Existing techniques often involve creating birefringent voxels (e.g., nanogratings) serially, limiting efficiency.

Purpose of the Study:

• To introduce a novel parallel five-dimensional (5D) optical data writing method.
• To overcome the speed limitations of conventional serial optical data writing approaches.
• To demonstrate a high-capacity and high-speed optical data storage solution.

Main Methods:

• Utilized a digital micromirror device (DMD) to project arrays of depth-resolved voxels with controlled shapes.
• Employed temporally focused femtosecond laser amplification for parallel voxel creation.
• Controlled the shapes of projected light spots to achieve parallel writing of voxels with different slow-axis azimuths.

Main Results:

• Successfully demonstrated parallel writing of 16x16 birefringent voxels with eight distinct slow-axis orientations.
• Achieved five-layer parallel data writing with 100% readout accuracy.
• Demonstrated a storage capacity of 1.5 terabytes per disc.

Conclusions:

• The developed parallel 5D optical data writing method offers a significant improvement over conventional serial approaches.
• This technology has the potential to achieve theoretical writing speeds of 7.5 megabytes per second with high-repetition-rate lasers.
• The method paves the way for practical high-speed and high-capacity optical data storage solutions.