Mr. WenLiang Zhu Profile

WenLiang Zhu

at Anhui Univ

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Proceedings Article | 24 October 2017 Paper

A fast point-cloud computing method based on spatial symmetry of Fresnel field

Xiangxiang Wang, Kai Zhang, Chuan Shen, Wenliang Zhu, Sui Wei

Proceedings Volume 10461, 104611H (2017) https://doi.org/10.1117/12.2285501

KEYWORDS: Computer generated holography

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Aiming at the great challenge for Computer Generated Hologram (CGH) duo to the production of high spatial-bandwidth product (SBP) is required in the real-time holographic video display systems. The paper is based on point-cloud method and it takes advantage of the propagating reversibility of Fresnel diffraction in the propagating direction and the fringe pattern of a point source, known as Gabor zone plate has spatial symmetry, so it can be used as a basis for fast calculation of diffraction field in CGH. A fast Fresnel CGH method based on the novel look-up table (N-LUT) method is proposed, the principle fringe patterns (PFPs) at the virtual plane is pre-calculated by the acceleration algorithm and be stored. Secondly, the Fresnel diffraction fringe pattern at dummy plane can be obtained. Finally, the Fresnel propagation from dummy plan to hologram plane. The simulation experiments and optical experiments based on Liquid Crystal On Silicon (LCOS) is setup to demonstrate the validity of the proposed method under the premise of ensuring the quality of 3D reconstruction，the method proposed in the paper can be applied to shorten the computational time and improve computational efficiency.

Proceedings Article | 24 October 2017 Paper

Architectural design of deep metallic sub-wavelength grating for practical holography display

WenLiang Zhu, Chuan Shen, MingHua Zhang, Sui Wei, XiangXiang Wang, Ye Wang

Proceedings Volume 10460, 104601E (2017) https://doi.org/10.1117/12.2285193

KEYWORDS: Optical design, Holography, Fabry–Perot interferometers, Surface plasmons

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Spatial light modulator (SLM) is the core device of holographic display, which requires a large space-bandwidth product (SBP), especially needing a wide viewing angle. According to the grating theory, the scale of the holographic display unit should be close to the wavelength of light. The transmission resonances of deep metallic sub-wavelength grating structure, which is produced by the surface plasmon and Fabry-Perot (FP) resonance based on metal grating phenomenon of Wood's anomaly, especially the metal-insulator-metal (MIM) structure provides a theoretical and effective technique for enhancing the reflection resonances and can be used for implementing the holographic display unit technology. In this paper, we replace the top electrode layer of the LCOS with a metallic deep sub-wavelength grating structure and change the grating period, slit width and spacer thickness. The simulation results by aid of CST software are given, which demonstrate that the improved device with dielectric medium parameter within liquid crystal refractive rate range (1.4~1.7) can reach 0 to 2π phase modulation in the visible wavelength range. Moreover, it also decrease the difficulty of device processing.

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