Article
Multidisciplinary Sciences
Morteza Jafari Siavashani, Elyas Nasimdoust, Parviz Elahi, Mohammad Taghi Tavassoly, Ali-Reza Moradi
Summary: Optical diffractometry (OD) with a phase step is an alternative to interferometry with less sensitivity to environmental vibrations. It has various interesting metrological and technological applications. In this study, we investigate the effect of surface roughness on the diffraction patterns of the phase step, and establish measures to evaluate the similarity between rough phase step diffractions and the ideal case.
SCIENTIFIC REPORTS
(2023)
Article
Optics
A. Zh Khachatrian, Zh R. Panosyan, G. P. Vardanyan, A. F. Parsamyan
Summary: This paper discusses the description of the superposition field generated by a system of wave source points with coherent emission. The conditions for the problem parameters are identified in a general form, allowing for a satisfactory description of the wave field within the framework of Fresnel and Fraunhofer approximations. The presented approach reproduces several known results of wave theory, which are used for directional amplification. The possibility of obtaining a superposition field with point amplification is considered.
Article
Optics
K. R. Sethuraj, Rajneesh Joshi, Bhaskar Kanseri
Summary: This study experimentally demonstrated the impact of Fraunhofer diffraction on the degree and state of polarization of partially coherent light fields, revealing the modulation effect of spatial coherence on polarization. The conceptual clarity provided by this experimental demonstration is valuable for polarization-sensitive applications such as imaging and tomography.
OPTICS COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Ji-Hwan Kwon, Joohyun Lee, Je In Lee, Byeong-Gwan Cho, Sooheyong Lee
Summary: By analyzing nano-diffraction speckles from bulk metallic glass, we investigated the coherence properties of a transmission electron microscope. The results showed that the electron probe beam had a highly coherent nature and that the coherence could be controlled. This study provides a foundation for applying advanced coherent diffraction methodologies to investigate local structures and dynamics at atomic-length scales across a diverse range of materials.
Article
Optics
J. S. Eismann, L. H. Nicholls, D. J. Roth, M. A. Alonso, P. Banzer, F. J. Rodriguez-Fortuno, A. Zayats, F. Nori, K. Y. Bliokh
Summary: This study demonstrates the existence of a transverse spin component in non-paraxial light, which is independent of the circular polarization state of the light. The results show that this transverse spin remains present even in non-paraxial fields generated from totally unpolarized light, suggesting a fundamental difference in the meaning of 'full depolarization' between 2D paraxial and 3D non-paraxial fields. This discovery opens up new avenues for investigating spin-related phenomena and optical manipulation using unpolarized light.
Article
Optics
Mohammad Taghi Tavassoly, Morteza Jafari Siavashani, Ali-Reza Moradi
Summary: This paper uses the photon approach to study optical concepts, such as diffraction from a single slit, double slit, and transmission phase step. It also applies the approach to explain the interference fringes in a bi-prism and a Michelson's interferometer. The coherence behavior of light is deduced from the uncertainty principles, and the ray optics laws and image formation formulae are extracted using the photon approach.
Article
Multidisciplinary Sciences
Jonas Nienhaus, Philipp Matten, Anja Britten, Julius Scherer, Eva Hoeck, Alexander Freytag, Wolfgang Drexler, Rainer A. Leitgeb, Thomas Schlegl, Tilman Schmoll
Summary: By providing high-resolution three-dimensional visualization of tissues and instruments, live volumetric optical coherence tomography (4D-OCT) has the potential to revolutionize ophthalmic surgery. However, the necessary imaging speed comes with increased noise levels, which poses challenges for real-time noise reduction. In this study, a low complexity neural network was proposed for denoising in a microscope-integrated 4D-OCT prototype. The neural network was trained using unpaired OCT images and achieved better denoising performance compared to traditional filtering algorithms.
SCIENTIFIC REPORTS
(2023)
Article
Optics
K. Mantel, I Barakat, V Nercissian, I Harder, S. Rothau
Summary: By reducing the number of phase singularities in speckle interferometry through physical means, the quality of phase deconvolution is improved and the separability of fringe systems is enhanced, especially for highly dynamic systems. The mechanism of reduction relies on tailoring the spatial coherence of the light source at the entrance of the interferometer, resulting in changes in the size and position of speckle patterns. The reduction mechanism is theoretically explained, simulated, and validated experimentally using a Michelson-Mach-Zehnder interferometer hybrid.
Article
Optics
Anatoly Socratovich Batoroev
Summary: The analytic representation of the diffraction field from the sector aperture in the Fresnel zone is derived in the form of a convergent series on incomplete cylindrical functions in the Poisson form. This new solution allows for the calculation and acquisition of three-dimensional patterns of the field amplitude in the entire image plane, corresponding to the Fresnel approximation and applicable to arbitrary values of the opening angle and aperture radius.
Article
Optics
Austin W. Steinforth, Jose A. Rivera, J. Gary Eden
Summary: A laser resonator architecture with an internal array of microlenses is described, allowing for continuous variation of spatial coherence and speckle contrast ratio. This architecture enables high-resolution optical imaging of dynamic objects and phenomena, with the potential for imaging through fog.
Article
Optics
David Ceddia, Andrew M. Kingston, Daniele Pelliccia, Alexander Rack, David M. Paganin
Summary: Spatial light modulation is important for various applications, and we propose a new method called ghost projection that does not require configurable beam-shaping elements. Instead, this method displaces a single illuminated mask to create specific radiant exposure distributions. We study the effects and limitations of this method and investigate how to adapt it to spatially nonuniform illumination. These findings will help optimize experimental design and achieve practical ghost projection.
Article
Optics
Qizhen Wang, Xiongping Xia
Summary: By studying the application of Zernike polynomials in circular aperture diffraction, it is found that different degrees of deformation can lead to beam distortion, and by optimizing the imaging position and adding a phase compensator, the beam transmission quality can be improved.
Article
Chemistry, Analytical
Hristo Kabakchiev, Vera Behar, Ivan Garvanov, Dorina Kabakchieva, Avgust Kabakchiev, Hermann Rohling
Summary: This paper analyzes the use of Forward Scatter Radar (FSR) systems to detect airplanes using cosmic emission, proposing a suboptimal multichannel algorithm for signal detection and parameter evaluation. The results show the theoretical possibility of detecting airplanes at close ranges through the Forward Scatter (FS) effect.
Article
Optics
Fujun Chen
Summary: This article investigates the Fraunhofer diffraction pattern of the output field in a nonlinear optomechanical cavity with a degenerate optical parametric amplifier (OPA) and a higher order excited atomic ensemble. Studies show that the higher-order-excitation atom, similar to the degenerate OPA, induces an electromagnetically induced grating in the output spectrum of the probe field. The coherence of the mechanical oscillator leads to transfer of the probe energy in different diffraction orders, generating the phenomenon of optomechanically induced grating from the output probe field.
LASER PHYSICS LETTERS
(2023)
Article
Optics
Yingpeng Zhao, Yutong Lin, Dianrong Li, Feichen Wang, Bing Cheng, Qiang Lin, Zhenghui Hu, Bin Wu
Summary: This paper presents a novel method for measuring filament diameter based on image-based fitting, which improves the measurement accuracy by image processing and fitting formula. The method's accuracy is verified through experiments and comparison with other methods.
Article
Multidisciplinary Sciences
Ottavia Jedrkiewicz, Alessandra Gatti, Enrico Brambilla, Martin Levenius, Gintaras Tamosauskas, Katia Gallo
SCIENTIFIC REPORTS
(2018)
Editorial Material
Materials Science, Characterization & Testing
Federica Bertolotti, Fabio Ferri, Norberto Masciocchi, Antonietta Guagliardi
POWDER DIFFRACTION
(2019)
Article
Optics
E. Brambilla, A. Gatti
Review
Engineering, Biomedical
Payam Zarrintaj, Joshua D. Ramsey, Ali Samadi, Zhaleh Atoufi, Mohsen Khodadadi Yazdi, Mohammad Reza Ganjali, Leila Mohammadi Amirabad, Ehsan Zangene, Mehdi Farokhi, Krzysztof Formela, Mohammad Reza Saeb, Masoud Mozafari, Sabu Thomas
ACTA BIOMATERIALIA
(2020)
Article
Chemistry, Multidisciplinary
Federica Bertolotti, Anna Vivani, Daniele Moscheni, Fabio Ferri, Antonio Cervellino, Norberto Masciocchi, Antonietta Guagliardi
Article
Multidisciplinary Sciences
Fabio Ferri, Federica Bertolotti, Antonietta Guagliardi, Norberto Masciocchi
SCIENTIFIC REPORTS
(2020)
Article
Biochemical Research Methods
Lorenzo Cortese, Giuseppe Lo Presti, Marco Pagliazzi, Davide Contini, Alberto Dalla Mora, Hamid Dehghani, Fabio Ferri, Jonas B. Fischer, Martina Giovannella, Fabrizio Martelli, Udo M. Weigel, Stanislaw Wojtkiewicz, Marta Zanoletti, Turgut Durduran
Summary: In recent years, a typical implementation of diffuse correlation spectroscopy (DCS) instrumentation has been widely adapted, but there are still no detailed recipes to design such instruments to meet predefined signal-to-noise ratio and precision targets. This study conducted DCS experiments using liquid tissue simulating phantoms to investigate the impact of detected photon count-rate, number of parallel detection channels, and measurement duration on precision and SNR.
BIOMEDICAL OPTICS EXPRESS
(2021)
Article
Chemistry, Physical
Federica Bertolotti, Anna Vivani, Fabio Ferri, Pietro Anzini, Antonio Cervellino, Maryna Bodnarchuk, Georgian Nedelcu, Caterina Bernasconi, Maksym Kovalenko, Norberto Masciocchi, Antonietta Guagliardi
Summary: Colloidal nanocrystals of fully inorganic lead halide perovskites can self-organize into highly ordered supercrystals with compelling optical characteristics. This offers an opportunity to investigate uncommon collective properties at the fundamental level.
CHEMISTRY OF MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Pietro Anzini, Daniele Redoglio, Mattia Rocco, Norberto Masciocchi, Fabio Ferri
Summary: Light scattering and turbidimetry techniques are important methods for characterizing the dynamics and structure of nanoparticles and nanostructured networks. They probe different length scales and can be used to characterize different types of samples.
Article
Chemistry, Multidisciplinary
Fabio Ferri, Maria Chiara Bossuto, Pietro Anzini, Antonio Cervellino, Antonietta Guagliardi, Federica Bertolotti, Norberto Masciocchi
Summary: The Debye scattering equation (DSE) is widely used for analyzing total scattering data of nanocrystalline materials. In its modified form (MDSE), contributions from uncorrelated thermal agitation terms and average site-occupancy factors (s.o.f.'s) are included for defective crystalline nanoparticles (NPs). This paper provides a theoretical demonstration of the s.o.f.'s and corrects a glitch in the original MDSE, discussing their physical significance. Three new MDSE expressions are introduced for distinct defective NP ensembles, and the beneficial aspects and shortcomings of introducing s.o.f.'s as refinable parameters are demonstrated through numerical simulations and atomistic modeling.
ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES
(2023)
Article
Engineering, Biomedical
Federica Bertolotti, Francisco J. Carmona, Gregorio Dal Sasso, Gloria B. Ramirez-Rodriguez, Jose Manuel Delgado-Lopez, Jan Skov Pedersen, Fabio Ferri, Norberto Masciocchi, Antonietta Guagliardi
Summary: By combining small-angle X-ray scattering (SAXS) and synchrotron wide-angle X-ray total scattering (WAXTS) analyses, the spatial interplay between amorphous and crystalline components within bone samples and biomimetic carbonated nano-apatites was investigated. Research showed that the amorphous material is predominantly distributed along the lateral sides of the nanoplates, forming a core-crown-like arrangement.
ACTA BIOMATERIALIA
(2021)
Article
Chemistry, Multidisciplinary
Llorenc Cremonesi, Chloe Minnai, Fabio Ferri, Alberto Parola, Bruno Paroli, Tiziano Sanvito, Marco A. C. Potenza
JOURNAL OF NANOPARTICLE RESEARCH
(2020)
Article
Optics
Alessandra Gatti
Proceedings Paper
Optics
E. Brambilla, O. Jedrkiewicz, K. Gallo, G. Tamosauskas, A. Gatti
OPTICS, PHOTONICS AND LASERS
(2018)
Article
Optics
Alessandra Gatti, Enrico Brambilla, Katia Gallo, Ottavia Jedrkiewicz
