Abstract
Random phase masks are important technical elements for realizing holographic memory systems that enable high density recording. However, the broadly distributed Fourier spectrum often presents a problem because wide recording spots result in reduced total storage capacity for a recording medium. In the present study, we propose modified random phase masks with phase modulation elements exhibiting Gaussian profiles to suppress the spread of the recording spot and keep it in a narrow area, based on the reduction of the high-frequency components in a random phase pattern. We confirm the effectiveness of the proposed random phase mask using simulations of a computer-generated binary hologram. However, issues still remain in terms of the fabrication of random phase masks with Gaussian profiles. Therefore, we evaluate the feasibility of fabricating the proposed random phase mask using molecular diffusion under photopolymerization. The results confirm the feasibility of this approach over a relatively wide area for actual fabrication.
Highlights
The global information society exhibits an expansion of data-centric management based on big data analysis
We have investigated the optimal configuration of phase modulation and apertures for Fourier hologram recording and reconstruction [26,27]
We propose a modified random phase mask with phase modulation elements exhibiting Gaussian profiles to restrict the distribution to a narrow area based on the reduction of high-frequency components in the random phase modulation pattern
Summary
The global information society exhibits an expansion of data-centric management based on big data analysis. Numerous related technologies have been studied for optical systems, including recording media [4,5,6,7,8,9,10,11,12,13] Among these technologies, an optical configuration for collinear holography has been proposed [14,15,16,17,18,19]. An optical configuration for collinear holography has been proposed [14,15,16,17,18,19] In this system, the signal beam with page data is co-axially surrounded by a ring-shaped reference beam. With the development of such robust optical systems, studies on various configurations have been reported such as phase modulation masks and apertures for practical
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