Two-dimensional simulation of holographic data storage medium for multiplexed recording

Area of Science:

• Holography
• Photopolymerization Dynamics
• Optical Materials

Background:

• Photopolymer recording processes are crucial for holographic data storage.
• Accurate simulation of refractive index modulation is essential for predicting hologram performance.
• Multiplexed holograms present challenges in maintaining diffraction efficiency.

Purpose of the Study:

• To develop a new analysis model for photopolymer recording processes.
• To calculate the two-dimensional refractive index distribution of multiplexed holograms.
• To understand the time response and diffraction efficiency degradation in multiplexed hologram recording.

Main Methods:

• Simultaneous calculation of monomer diffusion and polymerization in the photopolymer medium.
• Evaluation of the refractive index pattern on each layer.
• Utilizing the beam propagation method (BPM) to read out diffraction beams.

Main Results:

• The model successfully calculates the 2D refractive index distribution in a simulated photopolymer.
• It determines the diffraction beams from multiplexed holograms.
• Analysis of time response and estimation of diffraction efficiency degradation were performed.

Conclusions:

• This is the first model to determine diffraction beams from multiplexed holograms in a simulated photopolymer medium.
• The model provides insights into the dynamics of hologram recording and multiplexing.
• This work contributes to a better understanding of photopolymer hologram recording processes.