Numerical estimation of storage capacity in reflection-type holographic disk memory with three-dimensional...

Area of Science:

• Optics and Photonics
• Data Storage Technologies
• Computational Physics

Background:

• Holographic data storage offers high density potential.
• Speckle shift multiplexing is a method to increase storage capacity.
• Understanding factors limiting storage capacity is crucial for practical applications.

Purpose of the Study:

• To numerically investigate the maximum storage capacity of reflection-type holographic memory using three-dimensional speckle shift multiplexing.
• To derive an explicit expression for storage capacity based on interpage crosstalk noise.
• To evaluate the performance of holographic data storage through simulation.

Main Methods:

• Fabrication of a simulator for reflection-type holographic data storage.
• Calculation of wave propagation, hologram recording, and reconstruction using scalar diffraction.
• Analysis of diffraction efficiency and noise at the first null in speckle-shift multiplexing.

Main Results:

• Storage capacity is proportional to the numerical aperture (NA) to the fourth power.
• Storage capacity is proportional to the recording medium's volume.
• Storage capacity is inversely proportional to the wavelength (λ) to the third power (Capacity ∝ NA⁴ * Volume / λ³).

Conclusions:

• The derived expression provides a theoretical basis for optimizing holographic memory design.
• Numerical simulations confirm the scaling laws for storage capacity.
• The findings guide the development of high-capacity holographic data storage systems.