Article
Chemistry, Multidisciplinary
Sina Li, Jielian Zhang, Lingyu Zhu, Kai Zhang, Wei Gao, Jingbo Li, Nengjie Huo
Summary: In this study, broadband and polarization-sensitive photodetectors are achieved using the linear dichroism and narrow band gap of 2D As0.4P0.6. By varying the gate voltage, the absorption ratio of the photocurrent can be modulated from 1 to approximately 10, enabling a reconfigurable detection mode from polarization-independence to polarization-susceptibility.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Optics
Kuangyi Xu, Zachery B. Harris, M. Hassan Arbab
Summary: This study presents a portable and handheld 2-channel polarization-sensitive imaging instrument that can directly resolve terahertz (THz) speckle fields. It measures the polarization state of THz light and presents it in the form of the Stokes vectors of the THz beam upon interaction with the sample. The technique has been validated in surface scattering experiments and shows a strong dependence of the polarization state on surface roughness and THz frequency. It provides a fast method for broadband THz polarimetric measurement in various applications.
Article
Environmental Sciences
Maria Ballesta-Garcia, Sara Pena-Gutierrez, Aina Val-Marti, Santiago Royo
Summary: By evaluating the image contrast of images taken in a controlled foggy environment, it has been demonstrated that polarimetric images present an improvement in contrast compared to conventional intensity images.
Article
Chemistry, Multidisciplinary
Hui-Hsin Hsiao, Richard E. Muller, James P. McGuire, Deacon J. Nemchick, Chin-Hung Shen, Gerard van Harten, Mayer Rud, William R. Johnson, Austin D. Nordman, Yen-Hung Wu, Daniel W. Wilson, Yih-Peng Chiou, Myungje Choi, Jason J. Hyon, Dejian Fu
Summary: This study develops a broadband, high efficiency polarized beam splitter metagrating based on integrated resonant units, which enables simultaneous polarization analysis, spectral dispersion, and spatial imaging. It is a key technology component for the high-resolution multiple-species atmospheric profiler and can measure aerosol profiling in Earth's planetary boundary layer.
Article
Engineering, Electrical & Electronic
Ajeet Kumar, Elisa Giusti, Francesco Mancuso, Selenia Ghio, Alberto Lupidi, Marco Martorella
Summary: A new Pol-InISAR 3D imaging method is proposed for non-cooperative targets, combining interferometric phase information and 2D ISAR imaging. By exploiting full-polarimetry information, the optimal polarimetric combination is selected to obtain the highest coherence, reducing phase estimation error and enabling accurate 3D imaging. Simulated and real datasets are used to validate the proposed approach.
IEEE TRANSACTIONS ON COMPUTATIONAL IMAGING
(2023)
Article
Chemistry, Physical
Jie Zeng, Linlin Huo, Zhenyu Wang, Xin Sun, Yu Guo, Muyao Li, Mingya Tan, Shiqi Zhu, Jingqin Fang, Zhenghuan Zhao
Summary: In recent years, great progress has been made in precisely controlling the structures of magnetic nanoparticles to investigate structure-relaxivity relationships. However, the influence of hollow structures with unique interior structures on the relaxation rate of magnetic nanoparticles has been rarely studied. In this work, we obtained a series of hollow manganese-doped iron oxide nanoparticles (MnIONs) with different void and dopant ratios and investigated the influence of hollow structures on the T-1/T-2 relaxation rate. The results showed that hollow MnIO nanoparticles exhibit increased T-1 relaxivity due to the increased surface-to-volume ratio, while they also show increased T-2 relaxivity attributed to the increased number of magnetic cores per unit volume and magnetic field inhomogeneity induced by hollow structures.
CHEMISTRY OF MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Iole Pisciottano, Fabrizio Santi, Debora Pastina, Diego Cristallini
Summary: This study focuses on passive polarimetric ISAR for ship target imaging using DVB-S signals of opportunity. The research shows that polarimetric diversity can be beneficial for target classification by separating different scattering mechanisms in the polarimetric domain and enhancing ISAR image quality.
IEEE SENSORS JOURNAL
(2021)
Review
Environmental Sciences
Xiaobo Li, Lei Yan, Pengfei Qi, Liping Zhang, Francois Goudail, Tiegen Liu, Jingsheng Zhai, Haofeng Hu
Summary: Polarimetric imaging (PI) techniques have significant advantages in various fields, and deep learning (DL) has been successfully combined with PI to provide new solutions for image restoration, object detection, image fusion, scene classification, and resolution improvement tasks. This review introduces the relevant concepts and models of PI and DL, and covers the state-of-the-art works combining PI with DL algorithms, as well as recommends potential future research directions.
Article
Optics
C. Feng, C. Dorrer, C. Jeon, R. Roides, B. Webb, J. Bromage
Summary: This study investigates the pump-to-signal noise transfer in OPCPA for the first time and demonstrates a reduction of pump-induced contrast degradation through pump-seed delay optimization. The findings show that the pump-seed delay can effectively minimize the pump-induced contrast degradation even when parametric amplifiers are operated in saturation.
Article
Optics
Sara Pena-Gutierrez, Santiago Royo
Summary: This article aims to provide experimental insights and analyze the best polarimetric calibration method for a division of aperture polarimetric imager considering its implications on the experimental set-up and performance. The calibration methods are introduced, intermediate results are presented, and the ability of the set-up to estimate polarization information is evaluated. Accuracy errors below 10% are achieved for all polarization modes when using the Data Reduction Matrix or the Eigenvalue Calibration Method, but degrade significantly with the Polarizer Calibration Method. This is the first detailed comparison of calibration methods in the literature and the first application of the Polarizer Calibration Method to a division of aperture polarimeter.
Editorial Material
Engineering, Aerospace
James Park, Raghu G. Raj, Marco Martorella, Elisa Giusti
Summary: This article introduces a method for polarimetric 3-D ISAR imaging using multiple phase centers and a multilook algorithm, which improves target classification and identification, as well as enhances accuracy of height estimation in noisy conditions.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2022)
Article
Chemistry, Physical
Boxiang Zhang, Zhiyong Zhang, Chuanhong Jin
Summary: Polymer-sorted high-density carbon nanotube (CNT) arrays have the potential to extend the silicon-based Moore's law. Imaging these arrays using LVSEM on insulating substrates is necessary but challenging due to the nanoscale features and complex contrast. Two methods were developed to separate the contrasts and the imaging mechanism was investigated. The proposed contrast separation method can be a useful tool for further study and application of CNT arrays.
Review
Optics
Wenfei Zhang, Jian Liang, Guomei Wang, Huanian Zhang, Shenggui Fu
Summary: Polarimetric dehazing methods are effective in enhancing image quality under haze conditions and are widely developed and used in various applications. These methods can cope with haze and other turbid mediums effectively.
OPTICAL ENGINEERING
(2021)
Article
Instruments & Instrumentation
D. Haberberger, A. Shvydky, P. M. Nilson, S. Ivancic, D. H. Froula
Summary: Fresnel zone plates (FZPs) are diffractive elements that act as lenses for x-rays and have higher spatial resolution than pinholes. However, a significant amount of x-rays passing through FZPs do not diffract, resulting in a background noise. This study presents calculations of diffracted and un-diffracted flux profiles, allowing the optimization of contrast between imaging rays and background noise. Additionally, the implementation of a central block to block the zeroth order diffraction from the entire field of view is discussed.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Remote Sensing
Huguang Yao, Zhuo Li
Summary: This paper proposes an improved autofocus method using four polarization channel data to compensate for phase dispersion and polarimetric dispersion in spaceborne P-band full-polarimetric wideband synthetic aperture radar (SAR). Simulation results show that the proposed method is effective and superior to traditional methods.
REMOTE SENSING LETTERS
(2022)
