Article
Optics
V. B. Il'in, D. G. Turichina, V. G. Farafonov, S. I. Laznevoi, G. A. Gontcharov, A. A. Marchuk, A. V. Mosenkov, D. M. Poliakov, S. S. Savchenko, A. A. Smirnov, M. S. Prokopjeva
Summary: This article explores the applications of approximating non-spherical scatterers with spheroids in calculating optical properties. By improving the field expansion method using spheroidal wave functions and relating it to the standard spherical T-matrix, the accuracy and efficiency of the calculations are enhanced. Extensive numerical testing demonstrates the applicability of the algorithm for ensembles of spheroids with different orientations and shapes.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2023)
Article
Chemistry, Physical
Matt R. A. Majic, Baptiste Auguie, Eric C. Le Ru
Summary: This study compares different approximation methods to predict the spectra of metallic spheroidal nanoparticles. The results show that the Taylor expansion provides more accurate predictions and is applicable to a wider range of parameters.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Optics
Philip L. Marston, Michael Mishchenko
Summary: This study investigates the scattering of small drops using T-matrix calculations and identifies the presence of a horizontal V-shaped caustic under certain conditions.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2022)
Article
Optics
Arumona Edward Arumona, Krzysztof M. Czajkowski, Tomasz J. Antosiewicz
Summary: In this study, hyperbolic nanoresonators composed of anisotropic materials were investigated for their unique optical properties. The tunability of the optical resonances and the interplay between shape and material anisotropy in determining the spectral response were demonstrated. The quasistatic magnetic response of the nanoresonators revealed a material-dependent origin of the mode.
Article
Optics
Amos Egel, Krzysztof M. Czajkowski, Dominik Theobald, Konstantin Ladutenko, Alexey S. Kuznetsov, Lorenzo Pattelli
Summary: SMUTHI is a Python package for the efficient and accurate simulation of electromagnetic scattering by wavelength-scale objects in planarly layered media. It combines theoretical concepts and features to study a variety of materials and structures.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Optics
Sushil Pokharel, David Raveh, Olga Korotkova
Summary: We establish the properties of the cross-spectral density orbital angular momentum (CSD-OAM) matrix and introduce the OAM-resolved polarization properties for a stationary optical beam-like field. It is demonstrated that random fields contain two types of polarization, one associated with a single OAM mode and the other with a pair of modes.
Article
Optics
Janna M. Dlugach
Summary: In this study, we numerically model the scattering and absorption characteristics of polydisperse spheroidal soot particles covered by a nonabsorbing sulfate shell. Our results show that the absorption cross section is weakly dependent on the particle shape, but increases with aerosol size and decreases with wavelength. The absorption angstrom exponent is also weakly dependent on the spheroid axis ratio, but sensitive to the choice of wavelength, particle size, and amount of soot/sulfate. The backscattering linear depolarization ratio is highly sensitive to particle shape, size, amount of coating, and wavelength.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2023)
Article
Biochemistry & Molecular Biology
Jaeda M. Mendoza, Kenzie Chen, Sequoyah Walters, Emily Shipley, Kevin B. Aptowicz, Stephen Holler
Summary: In this study, computationally generated light scattering patterns were used to classify aerosol particles through morphological descriptors. The results showed improved accuracy compared to previous efforts, demonstrating the utility of the proposed descriptors.
Article
Astronomy & Astrophysics
C. Peest, R. Siebenmorgen, F. Heymann, T. Vannieuwenhuyse, M. Baes
Summary: We present a general framework for implementing and testing the polarization of radiation due to scattering, dichroic extinction, and birefringence of aligned spheroidal dust grains in 3D Monte Carlo radiative transfer codes. We derive a methodology for solving the radiative transfer equation governing the changes of the Stokes parameters in dust-enshrouded objects. Using the Muller matrix and the extinction, scattering, linear, and circular polarization cross sections of spheroidal grains, we compute changes in the polarization state of light.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Optics
Xiang Lu, Herbert Gross
Summary: In this study, the impact of different frequency components of surface errors induced by diamond-turned surface grinding on image quality is analyzed, and a Wigner function-based approach is proposed to model light as partially coherent. By selecting the proper definition of light coherence, a unified model is presented that combines statistical and deterministic models of surface errors, enabling efficient, simultaneous simulation of multiple scattering from high- and mid-spatial frequency surface errors, as well as the interference and edge diffraction of light.
Article
Biochemical Research Methods
Vikram Barauah, Shyon Parsa, Naail Chowdhury, Thomas Milner, Henry Grady Rylander III
Summary: This study investigates the detection of morphological changes in Bacillus subtilis using scattering angle resolved optical coherence tomography (SAR-OCT). The results show significant differences in the distribution of backscattering angle during the rod-to-coccus shape transition of the bacteria. The study supports the potential of utilizing SAR-OCT to detect bacterial morphological changes.
JOURNAL OF BIOMEDICAL OPTICS
(2022)
Article
Energy & Fuels
J. Jennings, D. J. Growney, H. Brice, O. O. Mykhaylyk, S. P. Armes
Summary: Asphaltenes, complex carbon-rich molecules found in crude oil, have a strong tendency to aggregate and phase separate. This causes issues in crude oil extraction, refining, and application. Understanding the morphology and mechanisms of asphaltene aggregation and designing stabilizers to prevent phase separation have been the focus of research. Imaging techniques and light scattering provide limited structural information, while small-angle scattering and X-ray diffraction offer a wealth of information about asphaltene structure.
Article
Optics
Chenxu Gao, Bingqiang Sun
Summary: The Jacobians of particle scattering properties with respect to aspect ratio and effective radius are significantly improved using the improved invariant imbedding T-matrix method, and the discrepancies between different definitions of effective radius are discussed.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2022)
Article
Chemistry, Multidisciplinary
Dritan Siliqi, Alessio Adamiano, Massimo Ladisa, Cinzia Giannini, Michele Iafisco, Lorenzo Degli Esposti
Summary: In this study, the formation and growth of calcium phosphate nanoparticles were investigated in situ using synchrotron X-ray scattering techniques. The combined SAXS/WAXS method allowed for the tracking of particle nucleation, size, morphology, and crystal growth, as well as understanding the effects of temperature and ligand ions.
Article
Engineering, Multidisciplinary
Ting-Ting Yang, Yue Shui, Cheng-Sha Wei, Li-Zhao Huang, Chao-Wen Yang, Guang-Ai Sun, Jing-Jing Han, Jia-Zhuang Xu, Zhong-Ming Li, Dong Liu
Summary: The effect of cyclic straining on stress softening/hysteresis and structural evolution of silica filled deuterated silicone rubber (SFdSR) has been investigated. In situ Rheo-SANS measurements suggest that the orientation of bound rubber responses sensitively to the strain and cycle-number. The results indicate substantial permanent changes occurring within bound rubber, filler network, and rubber matrix after deformation.
COMPOSITES PART B-ENGINEERING
(2022)
Editorial Material
Cell Biology
Kevin J. Chalut, Ewa K. Paluch
DEVELOPMENTAL CELL
(2016)
Article
Biochemical Research Methods
Andrew C. Hodgson, Christophe M. Verstreken, Cynthia L. Fisher, Ulrich F. Keyser, Stefano Pagliara, Kevin J. Chalut
Article
Chemistry, Physical
Christophe M. Verstreken, Kevin J. Chalut, Raphael Blumenfeld
Article
Biology
Christopher Revell, Raphael Blumenfeld, Kevin J. Chalut
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2019)
Article
Chemistry, Multidisciplinary
Hans Kleine-Bruggeney, Liisa D. van Vliet, Carla Mulas, Fabrice Gielen, Chibeza C. Agley, Jose C. R. Silva, Austin Smith, Kevin Chalut, Florian Hollfelder
Article
Biochemical Research Methods
Yang Zhao, Kengyeh K. Chu, Evan T. Jelly, Adam Wax
JOURNAL OF BIOPHOTONICS
(2019)
Article
Cell Biology
Han-Sang Park, Hillel Price, Silvia Ceballos, Jen-Tsan Chi, Adam Wax
Summary: Holographic cytometry was used for high-throughput phase imaging to characterize individual red blood cells stored under blood bank conditions. Physical traits of the cells were observed to change over time. The large volume of cell imaging data could be utilized for training machine-learning algorithms.
Article
Developmental Biology
Carla Mulas, Agathe Chaigne, Austin Smith, Kevin J. Chalut
Summary: Studying the dynamics of cell state involves consideration of multiple changing parameters, hindered by technical challenges in measuring them comprehensively and dynamically. A recent virtual workshop discussed approaches, experimental systems, and models for cell state transitions, highlighting some emerging solutions.
Review
Cell Biology
Henry De Belly, Ewa K. Paluch, Kevin J. Chalut
Summary: This article reviews the importance of mechanical signalling in development and adult organisms, and discusses the regulation of biological processes by outside-in mechanical signalling and cell surface mechanics. The interaction between mechanosensing, intracellular signalling, and cell surface mechanics has a significant impact on stem cell fate and development.
NATURE REVIEWS MOLECULAR CELL BIOLOGY
(2022)
Biographical-Item
Optics
Natan T. Shaked, YongKeun Park, Stephen A. Boppart, Adam Wax, Peter T. C. So
Summary: Gabriel Popescu will be remembered as a creative leader in biophotonics, making pioneering contributions to quantitative phase imaging and spectroscopy. He was also known as an engaging collaborator and a dear friend.
Article
Biophysics
Albert Rancu, Cindy X. Chen, Hillel Price, Adam Wax
Summary: Optical methods based on endogenous contrast can be used to examine cellular structure by analyzing refractive index changes. These changes can be visualized using different techniques and quantified using disorder strength and fractal dimension. By linking these two measurements, we can better understand cellular restructuring during different pathways.
BIOPHYSICAL JOURNAL
(2023)
Review
Developmental Biology
Yekaterina A. Miroshnikova, Marta N. Shahbazi, Jose Negrete, Kevin J. Chalut, Austin Smith
Summary: The Company of Biologists' 2022 workshop on 'Cell State Transitions: Approaches, Experimental Systems and Models' gathered an international and interdisciplinary team of investigators from various fields to study how cells navigate between different identities dynamically. This workshop is the second edition following a successful virtual workshop on the same topic in 2021.
Article
Biochemistry & Molecular Biology
Cindy X. X. Chen, George T. Funkenbusch, Adam Wax
Summary: Sickle cell disease (SCD) is a hereditary blood disorder with high mortality rates, especially in sub-Saharan Africa. Using holographic cytometry (HC), a label-free imaging modality, for morphological profiling of red blood cells (RBCs) can be an effective method to detect SCD. In this study, a deep learning classifier was developed using training data from over 2.5 million single-cell holographic images, and it demonstrated highly accurate classification even on unknown patient samples.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Review
Engineering, Biomedical
Ge Song, Evan T. Jelly, Kengyeh K. Chu, Wesley Y. Kendall, Adam Wax
Summary: OCT is a powerful optical imaging technique with applications in ophthalmology, but its high cost has limited accessibility, leading to the development of low-cost systems for widespread use. Low-cost OCT systems offer potential for clinical detection and enable application in fields outside ophthalmology.
PROGRESS IN BIOMEDICAL ENGINEERING
(2021)
Article
Biochemical Research Methods
Carla Mulas, Andrew C. Hodgson, Timo N. Kohler, Chibeza C. Agley, Peter Humphreys, Hans Kleine-Bruggeney, Florian Hollfelder, Austin Smith, Kevin J. Chalut
