Article
Polymer Science
Taihui Wu, Jianshe Ma, Chengchen Wang, Haibei Wang, Liangcai Cao, Ping Su
Summary: The study presents an optical encryption method based on computer-generated holograms printing of photopolymer. Experimental results show that large-size encrypted QR code and miniature keys can be printed in photopolymers, with advantages of high-density storage, high speed, large fault tolerance, and anti-peeping, suggesting good application prospects in optical encryption.
Article
Optics
YingYing Bai, ZhiYu Zhang, TianBao Chen, RuoQiu Wang, HongDa Wei, XueFeng Zeng, XueJun Zhang
Summary: The emergence of large-aperture telescopes has led to an increased demand for testing and alignment of large optical systems. Computer-generated holograms (CGHs) have proven to be an effective method for aspheric optical testing and alignment. However, the current lithography capability limits the maximum size of CGHs to 6 to 9 inches. Stitching technology shows promise for creating larger-sized CGHs.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Optics
Alejandro Velez-Zea, Roberto Torroba
Summary: Color holographic projection is demonstrated using a noniterative multiplane hologram generation technique and space division multiplexing. The technique allows for generation and reconstruction of color intensity distributions with multiple discrete planes and low computational cost even with three wavelengths. Experimental optical reconstruction of multiplane intensity distributions shows successful correction of chromatic aberration caused by space division multiplexing.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Optics
Liang Shi, Beichen Li, Wojciech Matusik
Summary: This paper introduces a deep learning-based method for synthesizing high-quality 3D holograms. With the proposed dataset and training protocol, real-time operation and correction of visual aberrations can be achieved, promising enhanced performance.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Review
Nanoscience & Nanotechnology
Jing Cheng Zhang, Yubin Fan, Jin Yao, Mu Ku Chen, Shirong Lin, Yao Liang, Borui Leng, Din Ping Tsai
Summary: This article provides an overview of recent advancements in the fundamentals and applications of programmable optical meta-holograms. It aims to provide readers with general knowledge and inspiration for applying these holograms in the metaverse, and discusses the challenges and prospects in these rapidly growing research areas.
Article
Chemistry, Multidisciplinary
Yingying Bai, Zhiyu Zhang, Ruoqiu Wang, Tianbao Chen, Xu Wang, Xuejun Zhang
Summary: The study investigates and experimentally verifies the measurement errors of DOCs with small-period CGHs, showing that imperfections of the scalar approximation in CGHs cannot be ignored. Developing rigorous evaluation methods to enhance the measurement accuracy of CGHs is of significant practical importance.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
M. Saad Bin-Alam, Joshua Baxter, Kashif M. Awan, Antti Kiviniemi, Yaryna Mamchur, Antonio Cala Lesina, Kosmas L. Tsakmakidis, Mikko J. Huttunen, Lora Ramunno, Ksenia Dolgaleva
Summary: Researchers have developed an RLC circuit model to estimate the nonlinear optical properties of meta-atoms, overcoming the current difficulty in determining their nonlinear optical properties. Results from different methods agree well, indicating that the RLC model can efficiently design nonlinear plasmonic metasurfaces.
Article
Optics
Ryo Higashida, Masato Miura, Yuta Yamaguchi, Nobuhiko Funabashi, Ken-ichi Aoshima, Kenji Machida, Masahiro Yamaguchi
Summary: This study proposes a technique for reconstructing computer-generated holograms and evaluating the quality of the reconstructed 3D images. The method mimics the lens of the eye, allowing adjustments of viewing position and eye focus. The angular resolution of the eye is used to output reconstructed images with the necessary resolution, and a reference object is used for image normalization. This enables numerical analysis of image quality. By comparing the reconstructed images with the original image under incoherent illumination, the image quality is quantitatively evaluated.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2023)
Article
Optics
Pavel A. Cheremkhin, Vitaly V. Krasnov, Vladislav G. Rodin, Rostislav S. Starikov
Summary: This paper proposes the use of amplitude holograms generated by the Hartley transform as filters in an incoherent correlator. The real computations using the HT are faster and less computationally intensive than the standard complex transforms. The performance of HT-based holograms is comparable to FT-based holograms in terms of diffraction efficiency, and shows better reconstruction quality in various metrics.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Optics
Jatin Abacousnac, David G. Grier
Summary: This paper introduces a dark trap created by superimposing Gaussian modes with different waist diameters, which is used to manipulate light-seeking and dark-seeking particles in the same system. The interference-based difference-of-Gaussians (DoG) trap can rigidly capture dark-seeking particles in three dimensions.
Article
Computer Science, Hardware & Architecture
Yang Wu, Xiangli Lei, Jun Wang, Ni Chen
Summary: Holographic display is an ideal method for 3D display, providing a realistic stereo perception for augmented reality prototypes without complex optical devices. However, generating high-quality holographic reconstructed images quickly and accurately has been a challenge. This study proposes a first-order optimization algorithm using the conjugate gradient direction to update phase parameters, which outperforms the widely used stochastic gradient method and the wirtinger holography method in terms of faster optimization with the same quality metrics.
Article
Computer Science, Hardware & Architecture
Andreas Georgiou, Joel Kollin, Charlie Hewitt, Praneeth Chakravarthula, Brian Guenter
Summary: This study investigates the use of Computer Generated Holograms (CGHs) to overcome the limitations of display image quality, particularly high-frequency noise in phase-only holograms. User studies are lacking in the existing literature on holographic systems that project dynamic two-dimensional images. In this experiment, participants compared three groups of images on a conventional monitor: the original image, simulated holographic reconstruction, and foveated reconstruction based on pupil position. The results suggest that foveation is crucial in the design and construction of commercial holographic displays.
Article
Chemistry, Multidisciplinary
Chen Chen, Shenglun Gao, Wange Song, Hanmeng Li, Shi-Ning Zhu, Tao Li
Summary: Manipulating spin light using metasurfaces with controlled geometric phase has been successful, especially with the introduction of local phase manipulation technique with planar chiral meta-atoms, which enhances the flexibility and functionality of spin light control in metasurface designs.
Article
Chemistry, Multidisciplinary
Tomoyoshi Shimobaba, Shuhei Katsuyama, Takashi Nishitsuji, Ikuo Hoshi, Harutaka Shiomi, Fan Wang, Takashi Kakue, Naoki Takada, Tomoyoshi Ito
Summary: This study proposes a method to generate holograms with different motion parallax from existing ones without re-rendering 3D scenes and re-calculating holograms, using Fourier band-pass filtering and trigonometric functions to simplify computational processes.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Multidisciplinary
Yunxuan Wei, Tie Hu, Xing Feng, Ming Zhao, Zhenyu Yang
Summary: Multiplexed planar printings are essential for high capacity display, information storage, and encryption. This study proposes an angle multiplexing framework that combines holograms and printings, resulting in multiplexed printings with hundreds of channels. The method allows for generating printings combining various holographic methods and enables flexible angle-dependent printing display and massively multiplexed encryption systems.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Optics
Shinho Lee, Min-Kyo Seo
Summary: This study introduces a full three-dimensional wavelength-scale plasmomechanical resonator that allows for precise detection of picometer-scale longitudinal mechanical oscillation and investigates the tunability and thermoelastic effect of mechanical resonance.
Article
Nanoscience & Nanotechnology
Wongi Park, Jongmin Lee, Moon Jong Han, Joanna Wolska, Damian Pociecha, Ewa Gorecka, Min-Kyo Seo, Yun-Seok Choi, Dong Ki Yoon
Summary: A photonic lattice is an efficient platform for exploring quantum phenomena, but traditional fabrication methods using conventional materials are costly and complex. This study demonstrates a simple and cost-effective fabrication method for a reconfigurable chiral photonic lattice using helical nanofilament liquid crystal phase and diffraction grating.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Geonhyeong Park, Ahram Suh, Hanqing Zhao, Changjae Lee, Yun-Seok Choi, Ivan I. Smalyukh, Dong Ki Yoon
Summary: Topological solitons are continuous field configurations embedded in a uniform background and occur in various fields. However, observing their real-time morphogenesis and dynamics is challenging due to their large or small size and timescale. Researchers have found a new method to observe the generation and transformation of topological solitons using cholesteric liquid crystals confined in patterned substrates. The experimental demonstration shows the formation of topologically protected structures through the transformation of topological defects.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Dongha Kim, Arthur Baucour, Yun-Seok Choi, Jonghwa Shin, Min-Kyo Seo
Summary: The article introduces a platform that allows for the spontaneous generation and active manipulation of an optical vortex-antivortex pair using an external field. By utilizing an aluminum/silicon dioxide/nickel/silicon dioxide multilayer structure, a gradient-thickness optical cavity is created, where the magneto-optic effects of the nickel layer affect the transition between different topological phases. The vortex-antivortex pairs in the reflected light by the device are generated through mathematical singularities in the generalized parameter space of the silicon dioxide layers and exhibit polarization-dependent and topology-dependent dynamics driven by external magnetic fields.
Article
Optics
Hyeon Hwang, Hyungjun Heo, Kiyoung Ko, Mohamad Reza Nurrahman, Kiwon Moon, Jung Jin Ju, Sang-Wook Han, Hojoong Jung, Hansuek Lee, Min-Kyo Seo
Summary: This study demonstrates a two-point coupled lithium niobate racetrack micro-resonator that allows for electro-optical modulation between the zero- and critical-coupling conditions with minimal disturbance to the intrinsic properties of the resonant mode.
Article
Multidisciplinary Sciences
Changjae Lee, Soon Mo Park, Soobin Kim, Yun-Seok Choi, Geonhyeong Park, Yun Chan Kang, Chong Min Koo, Seon Joon Kim, Dong Ki Yoon
Summary: In this study, the authors demonstrated reversible vertical alignment of Ti3C2Tx MXene sheets by applying an in-plane electric field. They also showed that the vertical alignment induced by the electric field can be reversed in the absence of a field. Additionally, they achieved uniaxially aligned MXene nanosheets on interdigitated electrodes and observed anisotropic electrical conductivity in the aligned MXene nanosheet film.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Wongi Park, Hyewon Park, Yun-Seok Choi, Dong Ki Yoon
Summary: This study proposes an optical rotation-based color tuning method, which provides a wide range of color tunability using a controlled cholesteric liquid crystal and two polarizers. The color range can be manipulated by engineering the optical rotation of the liquid crystal film, resulting in the attenuation of unexpected light sources and improved visibility.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Geonhyeong Park, Yun-Seok Choi, S. Joon Kwon, Dong Ki Yoon
Summary: The planar spin glass pattern, known for its randomness due to geometrical frustration, holds potential as a physical unclonable function (PUF) for advanced security systems in the digitalized society. Traditional magnetic spin glass patterns face obstacles in detection, posing challenges for authentication in security systems. A solution is introduced using a topologically protected maze pattern in chiral liquid crystals, exhibiting comparable randomness to magnetic spin glass. The maze can be identified through optical microscopy and machine learning-based object detection, offering a next-generation security system through microscopically controlled structures.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Sanghyeok Park, Dongha Kim, Yun-Seok Choi, Arthur Baucour, Donghyeong Kim, Sangho Yoon, Kenji Watanabe, Takashi Taniguchi, Jonghwa Shin, Jonghwan Kim, Min-Kyo Seo
Summary: Researchers developed a meta-mirror platform to customize the radiative decay rate and polarization correlation of excitons in TMDCs. By altering the optical layout, the radiative decay rate could be reduced by two orders of magnitude and a statistical correlation between emission intensity and spectral line width was observed. This platform shows great potential for tailoring the two-dimensional distributions of lifetime, density, diffusion, and polarization of TMDC excitons in advanced opto-excitonic applications.
Article
Optics
Mohamad Reza Nurrahman, Dongha Kim, Kwang-Yong Jeong, Kyoung-Ho Kim, Chun-Ho Lee, Min-Kyo Seo
Summary: By using the truncated nano-cone resonator and employing the base angle as a structural degree of freedom, the Q-BIC resonance with a high Q-factor of >150 over a wide wavelength range of > 100 nm can be achieved. Our approach is expected to boost the utilization of Q-BIC resonance in various applications requiring broadband spectral tuning.
Article
Nanoscience & Nanotechnology
Jung-Hwan Song, Philippe Lalanne, Min-Kyo Seo, Mark L. L. Brongersma
Summary: Mean-field theory-based models are commonly used for designing optical metamaterials. However, for applications involving layered device architectures, the dispersive properties and interfacial boundary conditions of the metamaterials need to be considered. In this study, we propose a method to calculate the optical transfer function for one-dimensional optical metamaterials, taking into account the dispersive properties of the effective index and the effective interfacial impedance.
Article
Chemistry, Multidisciplinary
Juri Kim, Yun-Seok Choi, Geonhyeong Park, Mingeun Kim, Jin Suk Myung, Woo Jin Choi, Soon Mo Park, Dong Ki Yoon
Summary: This article introduces a method for fabricating anisotropic DNA hydrogels and demonstrates the potential of directionally controlled DNA hydrogels as smart materials.