Holographic data storage is expected to realize capacity of terabytes as well as fast data-transfer rate of Gbits/sec on a disk format. This kind of performance will be a potential solution for next-generation storage of big data in diversities of applications such as cloud servers and ultra-high definition systems. In this work, we analyze and optimize the axial response of the holographic data storage, aiming at maximizing storage density while suppressing the inter-page crosstalk on the reconstructed data pages. The optical model of the three dimensional hologram recorded in the medium is presented. Based on the reconstructed data page model, inter-layer crosstalk is also analyzed by use of orthogonal reference patterns. The signal to noise ratio and bit error rate of the reconstructed data page are improved. Experiments are conducted to obtain the axial shift selectivity curves and verify the predicted storage density and capacity of a holographic optical disk.
Partially coherent light source has been used in holographic display due to less speckle noise and lower cost. Different from laser, it has a low temporal and spatial coherence. The reconstructed image would be blurred by the illumination properties such as size, wavelength bandwidth and divergence angle range of partially coherent light source. However, due to the limitation of the pupil diameter and the human eye’s sensitive wavelength, the blur of the reconstructed image cannot be recognized within a confined limit. The mathematical model of diffraction intensity distribution for holographic display is derived. The relationship between the illumination properties of partially coherent light source and the reconstruction results is simulated. The results suggest a criterion for the maximum size, wavelength bandwidth and divergence angle range.
Stereo depth is the most important factor for the 3D experience when viewing an autostereoscopic display. In this paper, we investigate the influence of viewing distance and viewing angle on stereo depth. First, we build the ideal stereo depth model based on the physiological limitation. Second, we establish a wave aberration model based on diffraction theory. The simulation and experimental results agree with the theoretical analyses. The model is of significant importance for giving a guidance on display system designing.
Gold nanorod has generated great research interests due to its tunable surface plasmon resonance (SPR). The mechanism of the SPR effect on the enhancements of optical performance for the volume holographic polymer is investigated. The resonance wavelength is dependent on the aspect ratio of the nanorod. Theoretical model for the localized surface plasmon resonance effect are developed and simulated for the interactions between the photopolymer components and nanorods in the gold nanorod doped volume holographic photopolymer. The experimental evaluation of the material suggests a novel candidate for potential applications in high-density optical data storage and high-resolution holographic display.