Article
Optics
Xin Yang, Shuming Jiao, Qiang Song, Guo-Bin Ma, Weiwei Cai
Summary: This study demonstrated a phase-only color rainbow holographic near-eye display technology that achieves color holographic 3D display under white light illumination without the presence of conjugate light. It has potential applications in head-mounted 3D augmented reality displays without vergence-accommodation conflict.
Article
Chemistry, Multidisciplinary
Vladimir N. Borisov, Nikolay V. Muravyev, Mikhail V. Popov, Roman A. Okun, Aleksandr E. Angervaks, Gavril N. Vostrikov, Sergey A. Kozyukhin, Dmitry Yu. Terekhov, Petr I. Lazarenko, Ekaterina S. Musikhina, Sergei A. Ivanov
Summary: The holographic characteristics of chalcogenide film materials, with a typical thickness of 0.5-1.5 µm and composed of Ge-S and As-S compositions, were studied for potential use in augmented reality waveguide devices. It was demonstrated that the spectral and holographic properties of the materials can be controlled by varying their composition. Both volume and surface holographic elements were recorded and operated in the total internal reflection mode. Holograms with a diffraction efficiency of about 10% were achieved in the periscope mode. However, recording high-performance holographic elements on chalcogenide films currently requires significant values of exposure energy when recording in the near UV range (325-355 nm), which limits the effectiveness of holographic recording for creating such elements.
APPLIED SCIENCES-BASEL
(2022)
Article
Polymer Science
Muhammad Irfan, Suzanne Martin, Muhannad Ahmed Obeidi, Scott Miller, Frank Kuster, Dermot Brabazon, Izabela Naydenova
Summary: This study reports on holographic recording in novel magnetic nanocomposites and the observed temperature change in dry layers and liquid samples exposed to alternating magnetic field (AMF). The results reveal that the magnetic nanocomposite layers are suitable for recording holograms and can achieve local heating through magnetic induction.
Article
Chemistry, Multidisciplinary
Takayuki Takahashi, Tomoyoshi Shimobaba, Takashi Kakue, Tomoyoshi Ito
Summary: The paper introduces a time-division holographic projection method that corrects uneven brightness of holograms by controlling display time, and improves image quality through noise reduction methods. Simulation and optical reconstructions demonstrate a full-color reconstructed image with reduced noise and uneven brightness.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Rafal Kukolowicz, Maksymilian Chlipala, Juan Martinez-Carranza, Moncy Sajeev Idicula, Tomasz Kozacki
Summary: This work proposes an accurate and non-paraxial hologram update method for wide-angle CGHs that supports continuous viewpoint change around the scene. By reusing information from previous views and utilizing efficient algorithms, fast and accurate calculations are achieved for generating holographic information for the next viewpoint.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Multidisciplinary
Byung Gyu Chae
Summary: This study investigates the method of expanding the image space beyond the diffraction zone through numerical simulation and optical experiments. By restricting the angular view range to the diffraction angle, a uniform image without noise can be reconstructed within the primary viewing zone.
APPLIED SCIENCES-BASEL
(2022)
Article
Optics
Jiahao Wei, Chenxiao Wei, Haowen Ma, Dapu Pi, Haifeng Li, Xu Liu, Yongtian Wang, Juan Liu
Summary: In this paper, a method for accelerating computer-generated hologram computation is proposed, which achieves one-time high-quality fast generation of color holograms using dynamic convolution operation. The method compresses pre-calculated data, resamples the test object, and performs dynamic convolution operation to simplify the computation process. Numerical simulation and optical experimental results demonstrate that the proposed method achieves faster computation speed, higher reconstruction quality, and wider application compared to conventional methods.
Article
Optics
Marek Mach, Pavel Psota, Karel Zidek, Pavel Mokry
Summary: This paper presents a method of on-chip digital holographic interferometry for measuring the wavefront deformation of transparent samples. The setup consists of a compact on-chip interferometer based on a Mach-Zehnder arrangement with a waveguide in the reference arm. The experimental results demonstrate comparable accuracy to conventional methods while offering the advantages of high spatial resolution, simplicity, and compactness.
Article
Chemistry, Multidisciplinary
Eduard R. Muslimov, Airat Zh. Sakhabutdinov, Oleg G. Morozov, Nadezhda K. Pavlycheva, Damir M. Akhmetov, Danila Yu. Kharitonov
Summary: We propose a system and technique for measuring misalignments in a deployable telescope, and demonstrate its application on a specific telescope model. By utilizing laser point sources and interference patterns, the system can accurately measure the position of optical elements, allowing for the construction of a deployable telescope on a small satellite with sufficient alignment accuracy and increased collecting power.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Multidisciplinary
Philippe Gentet, Matteo Coffin, Yves Gentet, Seung-Hyun Lee
Summary: This study demonstrates how to record ultra-realistic, full-color, and full-parallax snapshot holographic portraits using a limited number of synchronized HD cameras and advanced image processing techniques. This new recording method enables the development and dissemination of holographic portraits to the public on a larger scale.
APPLIED SCIENCES-BASEL
(2023)
Article
Optics
Vivek Rastogi, Varun Kumar, Satish Kumar Dubey, Gufran Sayeed Khan, Chandra Shakher
Summary: The paper demonstrates the application of digital holography to measure the temperature of human hand skin and shows a good agreement with commercially available digital and infrared thermometers. The volume phase holographic optical element based DHI system accurately measures the surface temperature of human skin.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Nusrat Jabeen, A. K. Nirala
Summary: This study focuses on the use of renewable fuel alternatives in oil lamps and measures the temperature profiles of different oil lamps using digital holographic interferometry. The research finds that the thickness of the wick affects the flame temperature, and the oil lamp fueled by butter oil achieves the highest peak temperature.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Physics, Multidisciplinary
Leehwan Hwang, Seunghyun Lee
Summary: We propose a holographic printing-recording technology for near-eye display through volume holographic grating analysis. The use of holographic printing technology allows for modulation of different diffraction efficiencies, addressing the problem of disruption in image uniformity caused by initial recording conditions. This study demonstrates the fabrication and reconstruction of augmented reality images with higher diffraction efficiency using a digital HOE screen, simplifying design and facilitating mass production.
FRONTIERS IN PHYSICS
(2023)
Article
Optics
Subhash Utadiya, Vismay Trivedi, Gyanendra Sheoran, Atul Srivastava, Daniel Claus, Humberto Cabrera, Arun Anand
Summary: Thermal diffusion leads to spatiotemporally evolving temperature distribution and changes in local refractive index in material mediums. Digital holographic interferometry quantitatively images the refractive index variations in dielectric mediums caused by temperature changes. The phase retrieved from numerically processed digital holograms recorded at different time instances can be compared to obtain this information.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Polymer Science
Tina Sabel-Grau
Summary: This article presents detailed investigations of holographic recording in a new organic material, revealing the influence of material composition, processing, exposure conditions, and pre-exposure on the development and final characteristics of holographic gratings. Through time-resolved and spatially resolved analyses, the effects of pre-exposure on grating formation and refractive index contrast are determined. Unexpected effects are also observed.