Dynamic 2D implementation of 3D diffractive optics

Author(s):

Haiyan Wang and Rafael Piestun

Abstract:

“Volumetric computer-generated diffractive optics offer advantages over planar 2D implementations, including the generation of space-variant functions and the multiplexing of information in space or frequency domains. Unfortunately, despite remarkable progress, fabrication of high volumetric space-bandwidth micro- and nanostructures
is still in its infancy. Furthermore, existing 3D diffractive optics implementations are static while programmable volumetric spatial light modulators (SLMs) are still years or decades away. In order to address these shortcomings, we propose the implementation of volumetric diffractive optics equivalent functionality via cascaded
planar elements. To illustrate the principle, we design 3D diffractive optics and implement a two-layer continuous phase-only design on a single SLM with a folded setup. The system provides dynamic and efficient multiplexing capability. Numerical and experimental results show this approach improves system performance such as diffraction
efficiency, spatial/spectral selectivity, and number of multiplexing functions relative to 2D devices while providing dynamic large space-bandwidth relative to current static volume diffractive optics. The limitations and capabilities of dynamic 3D diffractive optics are discussed.”

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Publication: Optica

Issue/Year/DOI: Optica Volume 5, Issues 10
DOI: doi.org/10.1364/OPTICA.5.001220

Compact design for optical-see-through holographic displays employing holographic optical elements

Author(s):

Pengcheng Zhou and Yan Li and Shuxin Liu and Yikai Su

Abstract:

“Holographic AR display is a promising technology for head-mounted display
devices. However, it usually has a complicated optical system and a large form factor, preventing it from widespread applications. In this work, we propose a flat-panel design to produce a compact holographic AR display, wh
ere traditional optical elements are replaced by two holographic optical elements (HOEs). Here, these two thin HOEs together perform the optical functions of a beam expander, an ocular lens, and an optical combiner. Without any bulky traditional optics, our design could achieve a compact form factor that is similar to a
pair of glasses. We also implemented a proof-of-concept prototype to verify its feasibility. Being compact, lightweight and free from accommodation-conve
rgence discrepancy, our design is promising for fatigue-free AR displays.”

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Publication: Optics Express

Issue/Year/DOI: Optics Express Volume 26, Issue 18
DOI: 10.1364/OE.26.022866

Accelerated generation of holographic videos of 3-D objects in rotational motion using a curved hologram-based rotational-motion compensation method

Author(s):

Hong-Kun Cao and Shu-Feng Lin and Eun-Soo KimAbstract:

“Abstract: A new curved hologram-based rotational-motion compensation (CH-RMC) method is proposed for accelerated generation of holographic videos of 3-D objects moving on the random path with many locally different arcs. All of those rotational motions of the object made on each arc can be compensated, just by rotating their local curved holograms along the curving surfaces matched with the object’s moving trajectory without any additional calculation process, which results in great enhancements of the computational speed of the conventional hologram-generation algorithms. Experiments with a test video scenario reveal that average numbers of calculated object points (ANCOPs) and average calculation times for one frame (ACTs) of the CH-RMC-based ray-tracing, wavefront-recording-plane and novel- look-up-table methods have been found to be reduced by 73.10%, 73.84%, 73.34%, and 68.75%, 50.82%, 66.59%, respectively, in comparison with those of their original methods. In addition, successful reconstructions of 3-D scenes from those holographic videos confirm the feasibility of the proposed system. ”

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Publication: Optics Express
Issue/Year/DOI: Optics Express Volume 26, Issue 16 pp. 21279-21300 (2018)
DOI: 10.1364/oe.26.021279

Spectrum and space resolved 4D imaging by coded aperture correlation holography (COACH) with diffractive objective lens

Author(s):

A. Vijayakumar and Joseph Rosen

Abstract:

“In this Letter, we present an advanced optical configuration of coded aperture correlation holography (COACH) with a diffractive objective lens. Four-dimensional imaging of objects at the three spatial dimensions and with an additional spectral dimension is demonstrated. A hologram of three-dimensional objects illuminated by different wavelengths was recorded by the interference of light diffracted from the objects with the light diffracted from the same objects, but through a random-like coded phase mask (CPM). A library of holograms denoted point spread function (PSF) holograms were prerecorded with the same CPM, and under identical conditions, using point objects along different axial locations and for the different illuminating wavelengths. The correlation of the object hologram with the PSF hologram recorded using a particular wavelength, and at a particular axial location, reconstructs only the object corresponding to the particular axial plane and to the specific wavelength. The reconstruction results are compared with regular imaging and with another well-established holographic technique called Fresnel incoherent correlation holography.”

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Publication:  Optics Letters

Issue/Year/DOI: Optics Letters Vol.42, Issue 5, pp. 947-950 (2017)
DOI: 10.1364/OL.42.000947

Three-dimensional holographic lithography by an iterative algorithm

Author(s): Joshua J. Cowling, Gavin L. Williams, Alan Purvis, Richard McWilliam, Jose J. Toriz-Garcia, Nicholas L. Seed, Florian B. Soulard, and Peter A. Ivey

Abstract:

“We have applied an iterative algorithm for hologram design with multiple output image planes arranged in close proximity to create continuous patterns within an imaging volume. These holograms have been designed for photolithography on three-dimensional surfaces. The influence of simulated image plane separation on the final image, and its suitability for lithography, is assessed. Results are presented and the most suitable case is demonstrated experimentally.”

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Publication: Optics Letters, (subscription required)

Issue/Year/DOI: Optics Letters, Vol. 36, Issue 13, pp. 2495-2497 (2011)
doi:10.1364/OL.36.002495

Nonlinear response studies and corrections for a liquid crystal spatial light modulator

Author(s): RAVINDER KUMAR BANYAL, B. RAGHAVENDRA PRASAD

Abstract:

“The nonlinear response of light transmission characteristics of a liquid crystal (LC) spatial light modulator (SLM) is studied. The results show that the device exhibits a wide range of variations with different control parameters and input settings. Experiments were performed to obtain intensity modulation that is best described by either power-law or sigmoidal functions. Based on the inverse transformation, an appropriate pre-processing scheme for electrically addressed input gray-scale images, particularly important in several optical processing and imaging applications, is suggested. Further, the necessity to compensate the SLM image nonlinearities in a volume holographic data storage and retrieval system is demonstrated.”

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Publication: PRAMANA Journal of Physics (free download)

Issue/Year/DOI: PRAMANA Journal of Physics, Vol. 74, No. 6, June 2010, pp. 961-971

Materials for an Updatable Holographic 3D Display

Author(s): Cory W. Christenson, Pierre-Alexandre Blanche, Savas Tay, Ram Voorakaranam, Tao Gu, Weiping Lin, Peng Wang, Michiharu Yamamoto, Jayan Thomas, Robert A. Norwood, and Nasser Peyghambarian

Abstract:

“Holography is a powerful technique for providing high-resolution, realistic three-dimensional (3D) images without the need for special eyewear. A material that takes full advantage of the potential of holography, including updatability, has not existed. Here, the first updatable holographic 3D display based on a photorefractive polymer is summarized. The performance characteristics of these materials are measured, and how they relate to the development of additional display enhancements such as pulsed writing, white light viewing, and large viewing angle, are discussed.”

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Publication: Journal of Display Technology – via IEEE Xplore (subscription required)

Issue/Year/DOI: Journal of Display Technology, Issue: 99, pp1-7, (2010)
DOI: 10.1109/JDT.2010.2046620

Digital Holographic Capture and Optoelectronic Reconstruction for 3D Displays

Author(s): Damien P. Kelly, David S. Monaghan, Nitesh Pandey, Tomasz Kozacki, Aneta Michałkiewicz, Grzegorz Finke, Bryan M. Hennelly, Malgorzata Kujawinska

Abstract:

“The application of digital holography as a viable solution to 3D capture and display technology is examined. A review of the current state of the field is presented in which some of the major challenges involved in a digital holographic solution are highlighted. These challenges include (i) the removal of the DC and conjugate image terms, which are features of the holographic recording process, (ii) the reduction of speckle noise, a characteristic of a coherent imaging process, (iii) increasing the angular range of perspective of digital holograms (iv) and replaying captured and/or processed digital holograms using spatial light modulators. Each of these challenges are examined theoretically and several solutions are put forward. Experimental results are presented that demonstrate the validity of the theoretical solutions.”

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Publication: International Journal of Digital Multimedia Broadcasting, (free download)

Issue/Year/DOI: International Journal of Digital Multimedia Broadcasting, Volume 2010 (2010), Article ID 759323
doi:10.1155/2010/759323

Microdisplays in holographic mastering applications

Author(s): Sven Plöger, Sven Krüger, Stefan Osten, Günther Wernicke

Abstract:

“We demonstrate implementation and performance of microdisplay systems based on liquid-crystal technology in a variety of applications in holographic mastering. These displays can encode 2D objects information in grey scale or address holographic patterns in amplitude or phase. The main advantage is here to address any content dynamically with typically 60 Hz. Furthermore they show a resolution up to 1920×1200 pixels with a pixel size as small as 6.4 microns. Therefore they are extremely suitable for a dynamic or multi-exposure mastering process, to incorporate image content, phase-encode objects or any holographic features. This technology is already being used in holographic security applications as well as in commercial and display holography. We report about a few applications/implementations and show experimental results and performance parameters.

Link to Publications Page

Publication: SPIE Proceedings, (subscription required)

Issue/Year/DOI: Proc. SPIE, Vol. 7358, 73581H (2009);
doi:10.1117/12.823474

A high-capacity storage device for communications and multimedia systems

Author(s): Z. Y. Chen, Po S. Chung

Abstract:

“This paper introduces a high-capacity storage device based on the holographic optical disc storage system and applied field. It details a novel configuration of a single beam holographic storage system. Through coding the object light and reference light in same optical beam with a spatial light modulator (SLM), we achieve the aim of interference storage. The experimental results indicated this configuration can be used commercially. This system has the advantages of huge memory capacity and high access speed, thus offering a very useful storage alternative in the internet areas of communications and multimedia systems.”

Link to Publications Page

Publication: SPIE Proceedings, (subscription required)

Issue/Year/DOI: Proc. SPIE, Vol. 6775, 67750S (2007);
DOI:10.1117/12.730495