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Photonics
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Computer Holography
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Computer Holography

A special issue of Photonics (ISSN 2304-6732).

Deadline for manuscript submissions: closed (31 October 2022) | Viewed by 16304

Special Issue Editor

Prof. Dr. Hao Zhang

E-Mail Website
Guest Editor
Department of Precision Instrument, Tsinghua University, Beijing 100084, China
Interests: computer holography; holographic display; diffractive optics

Special Issue Information

Dear Colleagues,

Computer holography has been in development for decades since the pioneering work of Prof. Lohmann. With the developments of computer science and wavefront modulation techniques, computer holography has been widely applied in many interesting fields, such as holographic display, metasurface holography, beam shaping, optical manipulation, optical computing, and many more. In addition, the rise of deep learning also brings new optimizing tools for computer holography, which may pave an efficient way for quality 3D reconstructions. This Special Issue focuses on developments in algorithms, devices, systems, and applications for computer holographic technologies.

Topics of interest include but are not limited to the following:

  • Computer-generated holography
  • Holographic display
  • Holographic techniques for AR and VR applications
  • 3D display
  • Metasurface holography
  • Holographic optical elements
  • Deep learning for holography
  • Spatial light modulators
  • Holographic signal processing

Prof. Dr. Hao Zhang
Guest Editor

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Published Papers (7 papers)

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Research

12 pages, 51510 KiB  
Communication
Tailoring Large Asymmetric Laguerre–Gaussian Beam Array Using Computer-Generated Holography
by Sumit Kumar Singh, Yoshikazu Adachi, Kenji Kinashi, Naoto Tsutsumi, Wataru Sakai and Boaz Jessie Jackin
Photonics 2023, 10(3), 247; https://doi.org/10.3390/photonics10030247 - 24 Feb 2023
Cited by 4 | Viewed by 2367
Abstract
Laguerre–Gaussian beams are structured light beams with a donut-shaped symmetric intensity profile and a helical phase profile. The beam profile is defined by a quantized parameter known as the mode number which extends to infinity. The availability of unbounded modes makes these beams [...] Read more.
Laguerre–Gaussian beams are structured light beams with a donut-shaped symmetric intensity profile and a helical phase profile. The beam profile is defined by a quantized parameter known as the mode number which extends to infinity. The availability of unbounded modes makes these beams a promising candidate for next-generation optical computing, and optical communication technologies. The symmetric intensity profile of a Laguerre–Gaussian beam can be made asymmetric through certain techniques and these beams are known by the term ‘asymmetric Laguerre–Gaussian beams’. Here, the asymmetricity adds another degree of freedom to the beam (apart from its mode number) which helps in encoding more information compared to a symmetric beam. However, in order to harness the benefits of all the available degrees of freedom, it is required to generate a large number of such beams in a multiplexed fashion. Here, we report the generation of such a large array of asymmetric Laguerre–Gaussian beams for the first time. Computer-generated holography and spatial multiplexing techniques were employed to generate a large array comprising of 12 × 16 = 192 asymmetric Laguerre–Gaussian beams with an arbitrary mode index and asymmetricity. Full article
(This article belongs to the Special Issue Computer Holography)
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11 pages, 9438 KiB  
Article
Diffraction Characteristics of a Digital Micromirror Device for Computer Holography Based on an Accurate Three-Dimensional Phase Model
by Xiaoyu Wang and Hao Zhang
Photonics 2023, 10(2), 130; https://doi.org/10.3390/photonics10020130 - 27 Jan 2023
Cited by 2 | Viewed by 2290
Abstract
A digital micromirror device (DMD) has a wide range of applications in holographic display, light field manipulation, etc., due to its high-speed refresh rates. In order to precisely control the wavefront, the influence of the micromirror array structure of the DMD requires careful [...] Read more.
A digital micromirror device (DMD) has a wide range of applications in holographic display, light field manipulation, etc., due to its high-speed refresh rates. In order to precisely control the wavefront, the influence of the micromirror array structure of the DMD requires careful analysis. Based on an accurate three-dimensional phase model of DMD, we analyzed the diffraction characteristics of DMD. The model was established by accurately describing the phase distribution along each micromirror surface direction, and the distance between the point on the micromirror and the diffraction plane. The results showed that the orders of the DMD are the results of two groups of micromirrors interfering with each other, and a slight offset occurs when the incidence angle is twice the micromirror tilt angle, which can be removed by adjusting the incidence angle. The phase distribution results showed the main order of the DMD with all micromirrors in the on state can be approximated as a plane wave, which means that the hologram can be normally loaded on the DMD without worrying about phase disturbance from the micromirror array structure. This provides great convenience for computer holography based on DMD. Numerical simulations and experiments demonstrated the effectiveness of the work. Full article
(This article belongs to the Special Issue Computer Holography)
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10 pages, 4978 KiB  
Article
Speckle Noise-Free Interconnective Holographic Projection
by Hosung Jeon and Joonku Hahn
Photonics 2022, 9(12), 899; https://doi.org/10.3390/photonics9120899 - 24 Nov 2022
Cited by 1 | Viewed by 1663
Abstract
Generally, speckle noise is regarded as unavoidable in holographic projection, and it results from unexpected high spatial frequency components of diffracted light at the sharp edge of pixel openings in a spatial light modulator. Speckle noise typically reduces image contrast and degrades the [...] Read more.
Generally, speckle noise is regarded as unavoidable in holographic projection, and it results from unexpected high spatial frequency components of diffracted light at the sharp edge of pixel openings in a spatial light modulator. Speckle noise typically reduces image contrast and degrades the image quality of the holographic projection. In this study, we propose a novel holographic optical interconnection method free of speckle noise in holographic projection. This optical interconnection is achieved by using a holographic optical element (HOE). The HOE is designed to reconstruct Gaussian beams with low divergence. These Gaussian beams become points which form target images at desired depths. Since the Gaussian beam from the HOE does not share the same position with other Gaussian beams, there is no interference at the projection image. Therefore, the image is composed of the points from the Gaussian beams and there is no reason for unexpected high spatial frequency noise to appear on the image. In this paper, we fabricate the HOE, produced with our specially manufactured hologram printer, where the directions of two Gaussian beams with low divergence are controlled by goniometers. We experimentally demonstrated a speckle noise-free interconnective holographic projection. Two images are successfully formed at different depths by optically connecting two points in pairs. Full article
(This article belongs to the Special Issue Computer Holography)
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9 pages, 4714 KiB  
Communication
Parametric Generation of Variable Spot Arrays Based on Multi-Level Phase Modulation
by Yi Lei, Xi Zhang, Haining Yang and Daping Chu
Photonics 2022, 9(9), 633; https://doi.org/10.3390/photonics9090633 - 2 Sep 2022
Viewed by 2649
Abstract
Holographic generation of beam spot array with high uniformity have been extensively investigated while existing methods cannot combine high quality and tunability. This paper demonstrated a method to generate beam spot array by using phase-only liquid crystal on silicon (LCOS) device. The proposed [...] Read more.
Holographic generation of beam spot array with high uniformity have been extensively investigated while existing methods cannot combine high quality and tunability. This paper demonstrated a method to generate beam spot array by using phase-only liquid crystal on silicon (LCOS) device. The proposed method is highly flexible and tolerant to the defects within the LCOS device. The uniformity deviation of the speckle array can be limited to within ±5% in the numerical simulation and the experimental results agreed well with the simulation results. Full article
(This article belongs to the Special Issue Computer Holography)
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10 pages, 5098 KiB  
Article
Binary Computer-Generated Holograms by Simulated-Annealing Binary Search
by Jung-Ping Liu and Chen-Ming Tsai
Photonics 2022, 9(8), 581; https://doi.org/10.3390/photonics9080581 - 18 Aug 2022
Cited by 5 | Viewed by 2013
Abstract
The binary computer-generated hologram (BCGH) has attracted much attention recently because it can address the high-speed binary spatial light modulator (SLM), such as a digital micromirror device (DMD) SLM. In this paper, our concern is the development of an algorithm to produce high-quality [...] Read more.
The binary computer-generated hologram (BCGH) has attracted much attention recently because it can address the high-speed binary spatial light modulator (SLM), such as a digital micromirror device (DMD) SLM. In this paper, our concern is the development of an algorithm to produce high-quality BCGHs. In particular, simulated annealing (SA) is an efficient algorithm used to produce a phase-only computer-generated hologram. In the study of SA for the production of a BCGH, we found some inherent shortcomings of SA, and the quality of the produced BCGHs is limited. Accordingly, we have modified SA and propose the simulated-annealing binary search (SABS) algorithm. We have also proposed a method to quickly determine the parameters for SABS. In the comparison with SA, the mean square error of the SABS BCGHs decreases by 32% on average. Therefore, the SABS is a promising technique for a high-quality holographic display by DMD. Full article
(This article belongs to the Special Issue Computer Holography)
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11 pages, 3828 KiB  
Article
Combination Compensation Method to Improve the Tolerance of Recording Medium Shrinkage in Collinear Holographic Storage
by Xianying Qiu, Kun Wang, Xiao Lin, Jianying Hao, Dakui Lin, Qijing Zheng, Ruixian Chen, Suping Wang and Xiaodi Tan
Photonics 2022, 9(3), 149; https://doi.org/10.3390/photonics9030149 - 3 Mar 2022
Cited by 3 | Viewed by 1917
Abstract
Holographic optical storage has great potential for enormous data storage, although the recording medium can cause dimensional change, which can deteriorate the quality of the reconstructed hologram. Compensation in traditional off-axial holographic storage systems is sensitive to vibration and requires high precision. In [...] Read more.
Holographic optical storage has great potential for enormous data storage, although the recording medium can cause dimensional change, which can deteriorate the quality of the reconstructed hologram. Compensation in traditional off-axial holographic storage systems is sensitive to vibration and requires high precision. In contrast, a collinear system is more compact with better stability, and its compensation would be different. In this paper, the combination compensation method for compensating for the dimensional change of the recording medium by simultaneously adjusting the reading light wavelength and the focal length of the objective lens is established, which was implemented in a collinear system for a high dimension-change-rate (σ) of the medium condition. Its compensation effects for the lateral dimension change and the vertical dimension change were compared as well. The results show that the bit error ratio of the reconstructed hologram could be decreased to 0 for both of the dimensional change conditions with a large adjustment scope under σ = 1.5%. Compared with the compensation method, in which only the focal length or the wavelength are adjusted, this combination compensation method can enlarge the compensation scope and improve the tolerance of the recording medium shrinkage in a collinear holographic storage system. Full article
(This article belongs to the Special Issue Computer Holography)
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12 pages, 3933 KiB  
Article
Accelerated Generation of a Pinhole-Type Holographic Stereogram Based on Human Eye Characteristics in Near-Eye Displays
by Xu Zhang, Tao Chen, Yujian Pang, Kefeng Tu, Piao Dai, Guoqiang Lv, Zi Wang and Qibin Feng
Photonics 2022, 9(2), 95; https://doi.org/10.3390/photonics9020095 - 7 Feb 2022
Cited by 3 | Viewed by 2189
Abstract
In near-eye displays (NEDs), issues such as weight, heat, and power consumption mean that the rendering and computing power is usually insufficient. Due to this limitation, algorithms need to be further improved for the rapid generation of holograms. In this paper, we propose [...] Read more.
In near-eye displays (NEDs), issues such as weight, heat, and power consumption mean that the rendering and computing power is usually insufficient. Due to this limitation, algorithms need to be further improved for the rapid generation of holograms. In this paper, we propose two methods based on the characteristics of the human eye in NEDs to accelerate the generation of the pinhole-type holographic stereogram (HS). In the first method, we consider the relatively fixed position of the human eye in NEDs. The number of visible pixels from each elemental image is very small due to the limited pupil size of an observing eye, and the calculated amount can be dramatically reduced. In the second method, the foveated region rendering method is adopted to further enhance the calculation speed. When the two methods are adopted at the same time, the calculation speed can be increased dozens of times. Simulations demonstrate that the proposed method can obviously enhance the generation speed of a pinhole-type HS. Full article
(This article belongs to the Special Issue Computer Holography)
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