Article
Optics
Svetlana N. Khonina, Sergey I. Kharitonov, Sergey G. Volotovskiy, Viktor A. Soifer
Summary: This paper examines the comparative formation of perfect optical vortices in the non-paraxial mode using various optical elements. The analysis involves theoretical and numerical approaches to understand the relationship between ring radius and vortex order in non-paraxial mode. The findings provide insights for utilizing optical elements in applications involving perfect optical vortex formation.
Article
Optics
Honggeng Wang, Huangcheng Shangguan, Qiying Song, Yi Cai, Qinggang Lin, Xiaowei Lu, Zhanxin Wang, Shuiqin Zheng, Shixiang Xu
Summary: Investigation on the generation and evolution of different pulsed terahertz singular beams in long gas-plasma filaments induced by a shaped two-color laser field revealed three different types of THz singular beams, showcasing their generation mechanism.
Article
Optics
Liu Xin, Zhaoqing Li, Yashar E. Monfared, Chunhao Liang, Fei Wang, Bernhard J. Hoenders, Yangjian Cai, Pujuan Ma
Summary: A new class of angular dependent autofocusing ring Pearcey beams with a cross-phase structure is introduced in this Letter, showing non-uniform abrupt autofocusing behavior. The focal length, focusing ability, and direction of the beams can be adjusted flexibly using only the cross-phase structure. Poynting vectors are used to convincingly demonstrate the beam-focusing mechanism, with potential applications in optical tweezing, three-dimensional printing, material processing, and more.
Article
Optics
B. H. Swaliha, S. Asokan, J. Solomon Ivan
Summary: A first-order optical system consisting of two cylindrical lenses separated by a distance is found to be non-conserving of orbital angular momentum. The first-order optical system is effectively demonstrated to estimate phases with dislocations using a Gerchberg-Saxton-type phase retrieval algorithm, by making use of measured intensities. The tunable orbital angular momentum in the outgoing light field is experimentally demonstrated using the considered first-order optical system by varying the distance of separation between the two cylindrical lenses. (c) 2023 Optica Publishing Group.
Article
Optics
Li Ma, Zijun Zhan, Chao Chen, Chunxiang Liu, Chuanfu Cheng
Summary: Control of orbital angular momentum is crucial for ultrashort pulses. We propose an approach for mode selection using an optical mask with a spiral array, which allows flexible generation of structured orbital angular momentum modes.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Nirjhar Kumar, Ankit Arora, Ananth Krishnan
Summary: A simple and efficient method for generating arbitrary composite vortex (CV) beams using hybrid binary fork gratings (hBFG) was successfully demonstrated. The method was extended to generate CV beams with three different azimuthal charges and higher radial charges, providing a useful tool for generating complex beam shapes with engineered phase fronts.
Article
Physics, Multidisciplinary
Huaping Zang, Zhuanglei Miao, Mengguang Wang, Quanping Fan, Lai Wei, Chuanke Wang, Weimin Zhou, Yilei Hua, Leifeng Cao, Xinlian Xue, Haizhong Guo
Summary: A new optical element, Binary Single Focused Square Spiral Zone Plates (BSSZPs), is proposed in this study, which can simultaneously generate optical vortices with unique square symmetry and eliminate interference from higher-order foci. This innovative design is expected to improve the performance of optical image processing and alignment systems.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Multidisciplinary Sciences
Jean-Baptiste Gorce, Konstantin Y. Bliokh, Hua Xia, Nicolas Francois, Horst Punzmann, Michael Shats
Summary: This study reports self-guided propulsion of fast-spinning magnetic particles on a liquid surface, forming composite spinner-vortex quasiparticles with nontrivial dynamics. These spinner-vortices are attracted and dynamically trapped near boundaries, propagating along any shaped wall like liquid wheels. The propulsion velocity and distance to the wall are controlled by the spinner's angular velocity through balance between forces.
Article
Optics
Victor V. Kotlyar, Alexey A. Kovalev, Pouria Amiri, Peyman Soltani, Saifollah Rasouli
Summary: The study investigates the topological charge of the sum of two axisymmetric off-axis Laguerre-Gaussian beams, finding that when the indices are the same, the combined beam has the topological charge of one of the individual beams. Different indices result in the sum taking on specific values for the topological charge. Additionally, rules for selecting a feasible topological charge value are established, along with exploring the effects of exchanging and shifting between beams on the topological charge.
Article
Optics
J. C. Tung, B. H. Chen, C. K. Sung
Summary: In this study, the criteria for achieving adjustable rotation of optical vortices are analyzed and used to design a diode-pumped solid-state laser for generating frequency-doubled Her mite-Gaussian modes. Structured lights containing multiple nested vortices are produced using an external cylindrical mode converter. Theoretical exploration suggests that increasing the radius of curvature of the concave mirror and extending the cavity length can enhance the rotational angles of multiple vortices.
Article
Optics
Baby Komal, S. Deepa, Sunil Kumar, P. Senthilkumaran
Summary: The study investigates how the superposition of spin and orbital angular momentum states of light generates polarization singularities and uses a tilted lens to determine the polarization singularity indices. The effectiveness of this technique is demonstrated in determining the indices of V points and C points formed by the superposition of component scalar vortices with opposite-sign topological charges.
Article
Physics, Fluids & Plasmas
Saul Piedra, Josue Flores, Guillermo Ramirez, Aldo Figueroa, Miguel Pineirua, Sergio Cuevas
Summary: In this study, we analyze the mixing properties of a floating stirrer driven electromagnetically in a thin layer of electrolyte. The stirrer consists of two free-floating magnets with opposite polarities connected by a rigid coupling. Through experiments and numerical simulations, we identify a coherent structure similar to a tripolar vortex that promotes chaotic mixing of the fluid in the laminar regime.
Article
Physics, Multidisciplinary
Yiqi Fang, Shengyue Lu, Yunquan Liu
Summary: This study investigates HHG with transverse orbital angular momentum driven by spatiotemporal optical vortex pulses, revealing unique spatiospectral structures originating from the spatiotemporal optical singularity effect. By employing two-color counterspin and countervorticity STOV pulses, a robust method to control the spatiotemporal topological charge and spectral structure of high-order harmonics is discussed. The conservation rule of photon transverse orbital angular momentum in HHG process is also examined when mixing with photon spin angular momenta.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Yanhui Hu, Jack J. Kingsley-Smith, Maryam Nikkhou, James A. Sabin, Francisco J. Rodriguez-Fortuno, Xiaohao Xu, James Millen
Summary: A new polarization structure of light is synthesized using a levitated nanoparticle as a sensor. The generation of transverse orbital angular momentum (TOAM) in the structured light field has various applications in fundamental physics, optical manipulation of matter, and quantum optomechanics.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Ewa Fraczek, Wojciech Fraczek, Agnieszka Popiolek-Masajada
Summary: This paper suggests using high-order optical vortices as markers for laser beam positioning, with broken optical vortices arranged in constellations to locate beams carrying encoded information. Three positioning methods using intensity and phase maps were tested in experiments conducted in both laboratory and open space settings.
APPLIED SCIENCES-BASEL
(2021)
Article
Optics
P. Vaveliuk, Alberto Lencina, Jose A. Rodrigo, O. Martnez-Matos
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2015)
Article
Optics
Pablo Vaveliuk, Alberto Lencina, Jose A. Rodrigo, Oscar Martinez Matos
Article
Optics
V. H. Aristizabal, F. J. Velez, E. Rueda, N. D. Gomez, J. A. Gomez
Article
Optics
J. Vargas, D. Amaya, E. Rueda
Article
Optics
Pablo Vaveliuk, Alberto Lencina, Oscar Martinez-Matos
Article
Environmental Sciences
A. Lencina, C. Weber
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2020)
Article
Optics
Edgar Rueda, Juan H. Serna, Abdullatif Hamad, Hernando Garcia
OPTICS AND LASER TECHNOLOGY
(2019)
Article
Optics
Natalia Londono, Edgar Rueda, Jorge A. Gomez, Dafne Amaya, Alberto Lencina
OPTICS AND LASERS IN ENGINEERING
(2020)
Article
Chemistry, Multidisciplinary
Edgar Rueda, Juan Serna, Jose Ignacio Uribe, Daniel Ramirez, Franklin Jaramillo, Jaime Osorio, Hernando Garcia
Summary: An F-scan nonlinear spectrometer was used to measure the two-photon absorption coefficient of CH3NH3PbBr3 perovskite films. The experimental data was fitted using a two-band model and irradiance saturation correction, revealing a nonlinear absorption magnitude of cm/MW.
Article
Environmental Sciences
Alberto Lencina, Gustavo Romagnoli, Andrea Alonso, Noelia Ramos, Cristian D'Angelo, Lina Lett, Silvia Mestelan
Summary: This study utilized Laser-Induced Breakdown Spectroscopy to analyze 30 feedlot compost samples at different stability and maturity stages, determining the total P concentration through wet digestion and colorimetry with random calibrations. Results show that water content must be taken into consideration due to logistic implications, and calibrations with around 30% prediction error were achieved, providing a practical approximation for predicting total P content in compost for nutrient recycling on farms.
INTERNATIONAL JOURNAL OF RECYCLING OF ORGANIC WASTE IN AGRICULTURE
(2022)
Article
Optics
Dafne Amaya, Daniel Actis, Gonzalo Rumi, Alberto Lencina
Article
Optics
L. Cabezas, D. Amaya, N. Bolognini, A. Lencina
Article
Optics
Gonzalo Rumi, Daniel Actis, Dafne Amaya, Jorge A. Gomez, Edgar Rueda, Alberto Lencina
Article
Optics
N. Londono, E. Rueda, A. Gomez, D. Amaya, A. Lencina
OPTICA PURA Y APLICADA
(2017)