Article
Ophthalmology
Yusuke Seki, Takushi Kawamorita, Naoki Yamamoto, Takashi Tanigawa, Norihiro Mita, Natsuko Hatsusaka, Eri Kubo, Hiroshi Sasaki
Summary: This study investigated the impact of the size and location of waterclefts (WC), a subtype of cataract, on visual function using optical simulation analysis. The results showed that increasing WC size increased refraction and higher-order aberrations (HOA), while decreasing the modulation transfer function (MTF). WC located below the posterior subcapsule had a greater impact on visual function compared to those below the anterior subcapsule. Larger WC demonstrated a significant hyperopic shift and increased HOA. The MTF slightly decreased at a spatial frequency of 20 cycles/mm and notably decreased at 60 cycles/mm. In conclusion, the impact on visual function increased with increasing WC size.
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
(2022)
Article
Optics
Cuiling Zhang, Bei Zhang
Summary: This study investigates the refractive-index-mismatch issues of t-SIL, elaborating on two typical cases and proving the feasibility and tolerance of t-SIL when the refractive indices of three parts are not strictly matched. Solutions and suggestions for aberration compensation and practical operations are provided.
OPTICS COMMUNICATIONS
(2022)
Article
Medicine, General & Internal
Luis Salva, Scott Garcia, Salvador Garcia-Delpech, Anabel Martinez-Espert, Vicente Ferrando
Summary: The aim of this study was to evaluate the impact of different spherical aberration values on the optical performance of the FEMTIS Comfort intraocular lens. The results showed that increasingly negative spherical aberration values made the lens more bifocal, moderating its extended-depth-of-focus characteristic. Conversely, higher positive spherical aberration values shifted the through-focus modulation transfer function curve towards positive vergences, leading to worsened distance vision in the +1.00 to +2.00 D range, but improved vision in the +0.50 D to +1.00 D range. Therefore, assessing spherical aberration in patients before implanting asymmetric intraocular lenses is necessary for predicting outcomes and making informed decisions based on patients' visual requirements.
JOURNAL OF CLINICAL MEDICINE
(2023)
Article
Geochemistry & Geophysics
John Summerfield, Dayalan Kasilingam, Andrew Gatesman
Summary: The project aims to describe the spatially variant imaging performance of bistatic SAR using a localized spatially invariant approximation, and deals with spatial variations by segmenting the scene for accuracy improvement.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Optics
Clemens Bilsing, Hannes Radner, Sebastian Burgmann, Juergen Czarske, Lars Buettner
Summary: This paper presents a novel measurement system for 3D imaging with one camera and aberration correction of light propagation through a boundary. The system utilizes a Double-Helix Point Spread Function (DH-PSF) for 3D imaging and measures and corrects aberrations using a Fresnel Guide Star (FGS) and a deformable mirror. A demonstration measurement showed a significant reduction in uncertainty using adaptive optics. The technique can be used to measure complex three-dimensional flows and has potential applications in fuel cell optimization.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Guang-Yan Liu, Wei-Lun Hsu, Jui-Wen Pan, Chih-Ming Wang
Summary: This paper demonstrates a refractive-meta hybrid system using a ball lens and a meta-corrector to improve efficiency for metalenses with large numerical apertures. The system significantly reduces the spatial frequency requirement of the meta-device while effectively reducing the focal spot size.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Microscopy
Aoi Gohma, Naoya Adachi, Yasuo Yonemaru, Daiki Horiba, Kaori Higuchi, Daisuke Nishiwaki, Eiji Yokoi, Yoshihiro Ue, Atsushi Miyawaki, Hiromu Monai
Summary: This paper introduces the Deep-C microscope system, which achieves aberration-free imaging by using a motorized correction collar and contrast-based calculations. Current contrast-maximization techniques inadequately assess specific frequency bands, and existing methods like Peak-C are limited in terms of neighbor selection and noise susceptibility. The proposed Peak-F method addresses these limitations, emphasizing the importance of a broad spatial frequency range for accurate spherical aberration correction.
Article
Optics
Bahram Javidi, Artur Carnicer, Arun Anand, George Barbastathis, Wen Chen, Pietro Ferraro, J. W. Goodman, Ryoichi Horisaki, Kedar Khare, Malgorzata Kujawinska, Rainer A. Leitgeb, Pierre Marquet, Takanori Nomura, Aydogan Ozcan, YongKeun Park, Giancarlo Pedrini, Pascal Picart, Joseph Rosen, Genaro Saavedra, Natan T. Shaked, Adrian Stern, Enrique Tajahuerce, Lei Tian, Gordon Wetzstein, Masahiro Yamaguchi
Summary: This Roadmap article provides an overview of research activities in the field of digital holography, with sections covering sensing, 3D imaging, displays, virtual and augmented reality, microscopy, cell identification, tomography, label-free live cell imaging, and other applications. Each section represents the author's vision of the significant progress, potential impact, important developments, and challenging issues in the field of digital holography.
Article
Optics
Salkapuram Vidya Rani, Padamuttum Anitha, Nampally Sabitha, Dasari Karuna Sagar
Summary: The presence of optical aberrations can degrade the performance of an optical system. This study investigates the use of suitable amplitude-apodization pupils to tailor the point spread function (PSF) and achieve desired FWHM and suppressed side lobes. By comparing and analyzing various PSFs, the effects of monochromatic aberrations on different levels of apodization parameter beta have been controlled. The proposed apodizer effectively enhances the resolution of optical systems.
PHOTONICS LETTERS OF POLAND
(2023)
Article
Engineering, Electrical & Electronic
Liu Xin, Kuang Cuifang, Liu Xu, Hao Xiang
Summary: The Point Spread Function (PSF) is a key parameter for evaluating the performance of microscopes. In traditional microscopes, the closer the PSF is to the ideal Airy disk, the better the imaging performance. Through PSF engineering, the performance of microscopes in terms of imaging resolution and speed can be significantly improved, providing opportunities and challenges for the development of computational microscopy imaging technology.
LASER & OPTOELECTRONICS PROGRESS
(2021)
Proceedings Paper
Acoustics
Wei-Hsiang Shen, Meng-Lin Li
Summary: This study proposes a novel adaptive ultrasound imaging technique using point spread function reshaping filtering for phase aberration correction, which effectively reduces focusing error and increases imaging contrast and spatial resolution.
2022 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IEEE IUS)
(2022)
Article
Physics, Fluids & Plasmas
Wei Chen, Guosheng Zhu, Qingqing Deng, Zhenhua Wu, Lixia Yang, Lixin Guo, Zhixiang Huang, Jiangting Li
Summary: In this study, new expressions for wave structure functions for optical planes and spherical waves propagating in plasma turbulence were derived based on the refractive index undulation power spectrum of hypersonic plasma turbulence and Rytov approximation theory. The mathematical expressions for plasma turbulence modulation transfer function for optical planes and spherical waves were obtained using the wave structure function expression. The effects of different wavelengths, turbulent outer scales, and refractive index undulation variance on plasma turbulence modulation transfer function were calculated and analyzed. Results show that increasing the incident wavelength reduces the effect of plasma turbulence on the imaging system. Moreover, increasing the turbulence outer scale and reducing the refractive index undulation variance can also improve the imaging results.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Zhi Ning Chen, Teng Li, Xianming Qing, Jin Shi, Shunli Li, Yuanyan Su, Wei E. I. Liu, Chunhua Xue, Qun Lou, Zhi Hao Jiang, Ruolei Xu, Peiqin Liu, Huiwen Sheng
Summary: Recently, there has been increasing interest in the use of metamaterial-based lenses, known as metalenses, as innovative antenna technology. This article examines the evolution, principles, and technologies behind metalens antenna design, focusing on the latest progress in research and applications. It covers various types of metalens antennas and addresses their technical merits, challenges, applications, trends, and future research.
PROCEEDINGS OF THE IEEE
(2023)