Three-dimensional supercritical resolved light-induced magnetic holography.

Area of Science:

• Optics and Photonics
• Materials Science
• Data Storage Technologies

Background:

• Two-dimensional (2D) magnetic storage technologies face capacity limitations due to data growth.
• 3D volumetric all-optical magnetic holography offers a path to high-density storage but faces challenges.
• Existing methods struggle with magnetization purity, spot resolution, and reversal control.

Purpose of the Study:

• To propose and theoretically demonstrate a novel 3D light-induced magnetic holography system.
• To overcome limitations of current light-induced magnetization techniques.
• To achieve high-density 3D data storage with precise magnetic control.

Main Methods:

• Utilized a supercritical design with multibeam combination in a 4π microscopic system.
• Focused six coherent circularly polarized beams using opposing high numerical aperture objectives.
• Employed phase filters for controlling spot number and location, and light helicity for reversal.

Main Results:

• Demonstrated a 3D deep super-resolved purely longitudinal magnetization spot.
• Achieved a volumetric storage density of up to 1872 terabit per cubic inch.
• Showcased controllable magnetization arrays and flexible magnetization reversals.

Conclusions:

• The proposed 3D magnetic holography overcomes key challenges in light-induced magnetization.
• This technology enables unprecedented volumetric storage densities.
• Potential applications include data storage and information security, such as magnetic stripe identity verification.