Article
Chemistry, Physical
Nikolai G. Khlebtsov
Summary: This study derives two sets of analytical expressions for extinction, absorption, and scattering cross sections of small particles embedded in an absorbing host, one based on an improved electrostatic approximation and the other on a modification of the electrostatic approximation. The accuracy of the approximations is demonstrated through calculations for Au and Ag nanospheres in different host materials. The near-field scattering cross sections exhibit different scaling behaviors depending on host absorption, with an exception found for small particles where an increase in host absorption enhances the scattering peak.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Optics
Niels Gieseler, Aso Rahimzadegan, Carsten Rockstuhl
Summary: Laser-driven spacecrafts show promise for outer space exploration, but challenges regarding spacecraft stability and reflection need to be addressed. Researchers propose a design for lightweight, low-absorbing, high-reflective, and self-stabilizing curved metasurfaces.
Article
Optics
Alexey Porfirev
Summary: A method for active pulling/pushing laser beams for light-absorbing particles in the air is proposed, utilizing cascaded diffractive optical elements to generate first-order Bessel beams. The beams create self-imaging light fields, forming optical bottle beam traps to confine particles inside dark regions. This approach can easily realize optical conveyors for transportation and investigation of dangerous substances, viruses, and living cells in future microdevices.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Shangyu Zhang, Jinan Zhai, Jian Dong, Wenjie Zhang, Linhua Liu
Summary: This paper investigates the extinction and attenuation of particles in an absorbing host, outlines existing extinction definitions, and shows the important influences of the host absorption on void extinction. The generalized operational definition is found to be equivalent to the recent effective medium method according to the theory of multiple scattering.
Article
Optics
Hiroyuki Fujii, Moegi Ueno, Yuki Inoue, Toshiaki Aoki, Kazumichi Kobayashi, Masao Watanabe
Summary: This study developed model equations for light scattering properties and characteristic time of light propagation in polydisperse colloidal suspensions at different volume fractions. The interference effects on scattering properties and characteristic time were found to depend linearly on wavelength. Dimensionless analysis revealed a simple mechanism of the interference effects, independent of wavelength and source-detector distance.
Article
Biochemical Research Methods
Anthony Allali, Alexander D. Klose, Yves Berube-Lauziere
Summary: An efficient method using finite difference method and Crank-Nicolson method is introduced for modeling light propagation in 3D heterogeneous absorbing and scattering media with curved boundaries. The method is simple and efficient, providing accurate solutions for optical diffusion equation.
BIOMEDICAL OPTICS EXPRESS
(2021)
Article
Chemistry, Multidisciplinary
Han Yang, Gianni Jacucci, Lukas Schertel, Silvia Vignolini
Summary: In this study, various types of cellulose-based microparticles (CMPs) were introduced as biocompatible alternatives to high refractive index inorganic nanoparticles for efficient light scattering. The cellulose-based particles demonstrated excellent optical performance and were successfully used in the fabrication of scattering materials and high transmittance/haze films. The renewable nature and biocompatibility of these systems make them particularly suitable for applications in paints, LEDs, and solar cell devices, as well as in food and pharmaceutical coatings where component biocompatibility is essential.
Article
Engineering, Environmental
Sadegh Niazi, Kirsty R. Short, Robert Groth, Luke Cravigan, Kirsten Spann, Zoran Ristovski, Graham R. Johnson
Summary: Relative humidity (RH) can affect the survival of influenza A virus (IAV), and the survival can be predicted by the efflorescence/deliquescence divergent infectivity (EDDI) hypothesis. The study found different survival rates of IAV in effloresced and non-effloresced aerosols, with implications for controlling indoor air infection. The sudden change in RH from saturated to specific ranges also impacted the virus survival differently, supporting the EDDI model for predicting IAV survival under seasonal conditions.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Changsoon Cho, Neil C. Greenham
Summary: This study presents optical modeling methods and design rules for perovskite light-emitting diodes, including quantifying the Poynting vectors of radiating dipoles, addressing non-radiative coupling, and optimizing photon recycling effects. The simulation results predict that high external quantum efficiency can be achieved through optimization of microcavity, dipole orientation, and photon recycling effects.
Article
Materials Science, Multidisciplinary
Xi Zhao, Zhifeng He, Wentao Ou, Pengcheng Lin, Yingying Chen, Ying Chen
Summary: Exploiting advanced light-absorbing conjugated polymers is of great significance in achieving low-energy solar steam generation and clean water collection. In this study, a interfacial chemistry strategy is developed to synthesize conjugated polybenzobisthiazole (CP) microspheres with a narrow bandgap and high solar absorbance, which are then used in a solar evaporator to achieve efficient evaporation and energy utilization.
SCIENCE CHINA-MATERIALS
(2022)
Article
Materials Science, Ceramics
Xinrui Cheng, Guoqiang Xi, Yue-Wen Fang, JiaQi Ding, Jianjun Tian, Linxing Zhang
Summary: Polarization and optical properties of BiFeO3-based ferroelectric films are regulated by both chemical composition and interlayer design. The improvement of ferroelectricity and bandgap is achieved through these methods. The remanent polarization is enhanced from 0.2 mu C/cm2 to 73.8 mu C/cm2 and the band gap is reduced from 2.42 eV to 2.23 eV. The optimal films show improved polarization and band gap, with a short-circuit current density of 89.0 nA and open circuit voltage of 0.412 V.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Matias Kagias, Seola Lee, Andrew C. Friedman, Tianzhe Zheng, David Veysset, Andrei Faraon, Julia R. Greer
Summary: Nanoarchitected materials, with nanoscale features, exhibit unconventional properties such as ultralow density and high energy absorption. However, there is a lack of fabrication methods for producing these materials in a scalable manner. A new technique using holographic lithography with laser exposure is presented, allowing for the manufacturing of nanoarchitected materials with impact resistant capabilities. Experimental results demonstrate the potential of this method by producing nanoarchitected sheets with specific inelastic energy dissipation comparable to other high impact energy absorbing composites and nanomaterials.
ADVANCED MATERIALS
(2023)
Article
Multidisciplinary Sciences
Guanqun Han, Guodong Li, Jie Huang, Chuang Han, Claudia Turro, Yujie Sun
Summary: The study presents a group of ruthenium polypyridyl complexes with two-photon absorption capabilities, active with lower-energy (740 nm) light.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Jinliang Li, Yang Yang, Xiaohai Qu, Chenpin Jiang
Summary: This study uses a self-designed aspherical airborne camera to suppress the impact of stray light on image quality through the use of a baffle and vanes. Stray light analysis shows that the camera has strong stray light suppression capabilities.
APPLIED SCIENCES-BASEL
(2022)
Article
Environmental Sciences
Jonas Svensson, Johan Strom, Henri Honkanen, Eija Asmi, Nathaniel B. Dkhar, Shresth Tayal, Ved P. Sharma, Rakesh Hooda, Matti Lepparanta, Hans-Werner Jacobi, Heikki Lihavainen, Antti Hyvarinen
Summary: Anthropogenic activities in the Indo-Gangetic Plain release large amounts of light-absorbing particles (LAPs) into the atmosphere, affecting the radiation balance and contributing to glacier melt in the nearby Himalayas. A study in the central Himalayas of India found distinct vertical distribution of LAPs in snow pits, with enriched LAP layers and different deposition constants in younger and older snow layers. The presence of LAPs, especially mineral dust, highlights the importance of dust in the region and the potential impact of LAPs on snow cover in the Himalayas.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Optics
Alexey Porfirev
Summary: A method for active pulling/pushing laser beams for light-absorbing particles in the air is proposed, utilizing cascaded diffractive optical elements to generate first-order Bessel beams. The beams create self-imaging light fields, forming optical bottle beam traps to confine particles inside dark regions. This approach can easily realize optical conveyors for transportation and investigation of dangerous substances, viruses, and living cells in future microdevices.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Svetlana N. Khonina, Aleksey P. Porfirev
Summary: The study proposes vector modes based on inhomogeneously polarized HG vector beams, which maintain complete structural conservation of the beams during propagation and provide stability in both intensity and polarization state, ensuring the stability of other field characteristics including angular momentum. By controlling the HG mode composition in transverse components of the electromagnetic field, the three-dimensional characteristics of the field such as intensity, polarization, and spin angular momentum can be controlled. The visual analysis of the polarization state of inhomogeneously polarized beams is achieved using the distribution of the vector of three Stokes parameters, with the third Stokes parameter corresponding to the distribution of the longitudinal component of the SAM used for experimental measurements, supported by theoretical analysis, numerical simulations, and experimental results.
Article
Optics
Svetlana N. Khonina, Alexey P. Porfirev, Andrey V. Ustinov, Mikhail S. Kirilenko, Nikolay L. Kazanskiy
Summary: In recent years, there has been active research on structured laser beams for shaping inverse energy flow regions. However, these beams often have limitations in terms of the size and location of the generated inverse energy flow regions. This study investigates the use of vector Lissajous beams with special polarization symmetry to control the distribution of inverse energy flow.
Article
Multidisciplinary Sciences
Alexey Porfirev, Svetlana Khonina, Nikolay Ivliev, Alexei Meshalkin, Elena Achimova, Andrew Forbes
Summary: Azobenzene-containing polymers are efficient and versatile photonic materials used for the fabrication of linear diffraction gratings and spectral filters. This study proposes a method using carbazole-containing azopolymer thin films to visualize the longitudinal component of the incident laser beam, and successfully demonstrates detection and fabrication of microstructures with structured light.
SCIENTIFIC REPORTS
(2022)
Article
Optics
Pavel A. Khorin, Alexey P. Porfirev, Svetlana N. Khonina
Summary: An adaptive method is proposed for determining the type and magnitude of aberration based on optical processing of the analyzed wavefront. This method uses a multichannel filter matched to adjustable Zernike phase functions for compensating wavefront aberrations. The filter is dynamically tunable and implemented on a spatial light modulator. Experimental results demonstrate the efficiency of this method for detecting wavefront aberrations in a wide range.
Article
Optics
Svetlana N. Khonina, Andrey Ustinov, Alexey P. Porfirev
Summary: In this paper, a diatom optical element is introduced, which is a special case of the generalized spiral lens used for generating light fields with orbital angular momentum. Unlike the existing special cases, the diatom optical element shapes light fields with intensity distributions that are neither spirals nor rings. Additionally, the light fields shaped by these elements exhibit autofocusing properties and maintain their symmetry order during propagation.
Editorial Material
Optics
Nikolai I. Petrov, Alexey P. Porfirev
Article
Optics
A. P. Porfirev, S. N. Khonina, P. A. Khorin, N. A. Ivliev
Summary: Laser patterning is widely used in the fabrication of functional nanomaterials. This study demonstrates the use of vortex laser beams for spiral mass transfer in azopolymer films, showing polarization-dependent formation of different 3D structures. The theoretical analysis suggests that the profile of fabricated structures can be controlled by the polarization state of the radiation.
Article
Chemistry, Analytical
Pavel A. Khorin, Svetlana N. Khonina, Alexey P. Porfirev, Nikolay L. Kazanskiy
Summary: This article proposes a method of using multi-channel diffractive optical elements to achieve astigmatic transformations of different types and levels simultaneously. The proposed approach simplifies the analysis of vortex beam characteristics without additional adjustments.
Article
Optics
A. P. Porfirev, S. A. Fomchenkov, D. P. Porfiriev, S. N. Khonina, S. V. Karpeev
Summary: In this study, we investigate the possibility of trapping airborne light-absorbing particles using a multi-linear optical trap created with a cylindrical lens. We find that different shaped light lines can be used to trap particles of different sizes due to the photophoretic forces being dependent on light intensity. However, the fading intensity of non-main light lines caused by initial laser power attenuation leads to a significant decrease in trapping robustness and the escape of smaller trapped particles.
Article
Chemistry, Analytical
Alexey P. Porfirev, Svetlana N. Khonina, Nikolay A. Ivliev, Sergey A. Fomchenkov, Denis P. Porfirev, Sergey V. Karpeev
Summary: This study demonstrates the unique possibilities of processing azopolymers using a structured laser beam. It shows that these materials are highly sensitive to the polarization state of the illuminating beam and can be used to create non-uniform patterns by adjusting the polarization distribution.
Article
Chemistry, Multidisciplinary
Alexey P. Porfirev, Nikolay A. Ivliev, Sergey A. Fomchenkov, Svetlana N. Khonina
Summary: Recently, researchers have been focused on the realization of spiral mass transfer of matter. Nano- and microstructures fabricated using this mass transfer can generate light with non-zero orbital angular momentum (OAM) or sense chiral molecules. The chirality of spiral-shaped microstructures formed in metals and semiconductors depends on the topological charge (TC) of the illuminating optical vortex (OV) beam. However, with polarization-sensitive materials such as azopolymers, the situation is different. Azopolymers exhibit polarization-sensitive mass transfer on both the meso and macro levels, making them promising for diffractive optics and photonics. This study proposes the use of two-beam interference lithography to achieve spiral mass transfer with a desired number of spirals, where the TC of the OV beam can control the number of formed spirals. Experimental results confirm the potential of this technique for laser material processing of polarization-sensitive materials, showing good agreement with numerical simulations.
Article
Optics
Svetlana N. Khonina, Alexey P. Porfirev
Summary: We investigate new types of laser beams with autofocusing, rotating, and/or transformation properties theoretically, numerically, and experimentally. Using a spatial light modulator, we generate clusters/sets of shifted vortex Laguerre-Gaussian beams and their superpositions with additional phase distribution, thus forming rotating beam clusters with controlled individual autofocusing trajectories and complex structures. Furthermore, we explore the possibility of astigmatic transformation of the propagating laser beam clusters. These techniques provide additional control of the three-dimensional trajectories of structured laser beams and have applications in laser manipulation, laser material processing, and optical microscopy.
APPLIED PHYSICS B-LASERS AND OPTICS
(2023)
Review
Engineering, Electrical & Electronic
A. Porfirev, S. Khonina, A. Kuchmizhak
Summary: The orbital angular momentum (OAM) of light, which represents the dynamical rotation of a wavefront, is a crucial characteristic of structured electromagnetic fields. Research on the interaction between OAM and matter, initiated in 1992, has led to important advancements in various fields, including physics, chemistry, and biology. This review summarizes recent progress in areas such as laser material processing, optical tweezers, control of chirality, and various OAM-empowered linear and nonlinear effects. It also highlights the remarkable opportunities for modifying ultrahigh-intensity laser-plasma interactions at the atomic scale, as well as the potential applications of spatiotemporal optical vortices.
PROGRESS IN QUANTUM ELECTRONICS
(2023)
Article
Optics
Svetlana N. Khonina, Andrey V. Ustinov, Sergey I. Kharitonov, Sergey A. Fomchenkov, Alexey P. Porfirev
Summary: This paper investigates the formation of single and multiple optical bottle beams on the optical axis using a diffractive axicon with amplitude or phase apodization. The proposed approach allows precise control over the location and contrast of dark intensity regions on the optical axis. Experimental results using a spatial light modulator verify the accuracy of the numerical simulations. The designed and experimentally formed set of three optical bottle beams successfully trap light-absorbing agglomerations of carbon nanoparticles in air, demonstrating the effectiveness of this approach for optical manipulation applications.
