Article
Optics
Qin Yu, Bryan M. Hennelly
Summary: This paper repeats the derivation of the forces of a single-beam gradient laser trap on a dielectric sphere as first reported by Ashkin, and investigates the impact of partial absorption of light by the sphere on these trapping forces. The results show that absorption reduces the axial and transverse trapping forces and changes the trap position. The model also predicts the imparting of a rotational force on the sphere due to absorption.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Nanoscience & Nanotechnology
Theodoros D. Bouloumis, Domna G. Kotsifaki, Xue Han, Sile Nic Chormaic, Viet Giang Truong
Summary: This study demonstrates trapping of single nanoparticles in arrays of plasmonic coaxial nano-apertures and theoretically interprets the observed trap stiffness enhancement and quick particle trapping time. The research shows good trapping performance for nanoparticle delivery and trapping, bridging the gap between optical manipulation and nanofluidics.
Article
Optics
Hao Wu, Ping Zhang, Xuejing Zhang, Yi Hu, Zhigang Chen, Jingjun Xu
Summary: We report the selective trapping of chiral nanoparticles using vector Lissajous beams. By choosing appropriate parameters to determine the polarization vectors of light, local optical chirality densities appear in these beams. For a specific parameter set (p,q) = (2,1), which is preferred for selective trapping, the resulting vector beam has two dominant intensity spots with opposite chirality. In the transverse plane, one spot can trap a chiral particle while the other spot repels the same particle, and this can be reversed for particles with opposite chirality. The study analyzes the effect of various chiral parameters and particle radii on selective trapping. The non-conservative longitudinal forces are also discussed. The functionality achieved in identifying and separating different chiral particles may have applications in enantiomer separation and drug delivery in the field of pharmaceutics.
Article
Nanoscience & Nanotechnology
Yuzhe Xiao, Zhaoning Yu, Raymond A. Wambold, Hongyan Mei, Garrett Hickman, Randall H. Goldsmith, Mark Saffman, Mikhail A. Kats
Summary: This study introduces optical bottle beams for trapping atoms and small particles with low-index, comparing traps obtained by three different methods using a figure of merit (FoM). By utilizing an optimization algorithm, optical bottle-beam traps based on Gaussian beam illuminating a metasurface are identified to have superior power efficiency. A numerical demonstration using a silicon metasurface for creating an optical bottle-beam trap is provided.
Article
Engineering, Electrical & Electronic
Timor Melamed
Summary: An algorithm for designing and manipulating pulsed caustic beams along a predefined curved trajectory in free space is presented. The evaluation of the pulsed aperture field distribution and control of delay and amplitude are key in forming a uniform intensity profile of the beam along its axis. Numerical examples are provided to illustrate the algorithm.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2021)
Article
Optics
Fengyu Sun, Linwei Zhu, Wenpeng Wang, Zhiyong Shi, Yanqi Liu, Yi Xua, Qiang Shi, Yuxin Leng, Ruxin Li
Summary: Stable dynamic optical trapping for 3D particle manipulation is achieved by generating high uniformity 3D multifocal spots using non-iterative algorithms. The experimental results open up potential applications in colloid transport and micro-assembly of objects in the micro-operation field.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Physics, Multidisciplinary
Di Huang, Pengcheng Wan, Ling Zhou, Haiqin Guo, Ruihuang Zhao, Jun Chen, Jack Ng, Junjie Du
Summary: The working mechanism of single-beam optical tweezers is thoroughly examined using a newly established method. The conservative and nonconservative components of optical force are calculated for different optical regimes, and the concept of an "optical trapping core" is proposed to better illustrate the stability of the trapping process.
NEW JOURNAL OF PHYSICS
(2022)
Article
Optics
J. A. Sarabia-Alonso, J. G. Ortega-Mendoza, S. Mansurova, F. M. Munoz-Perez, R. Ramos-Garcia
Summary: This research demonstrates the 3D trapping and manipulation of vapor bubbles in liquids using a low-power continuous-wave laser and the Marangoni effect, achieving this by producing bubbles of different diameters with photodeposited silver nanoparticles on a multi-mode optical fiber. The thermal effects modulate the surface tension of the bubble wall, creating a 3D potential well, and the transfer of bubbles between fibers is shown using an array of three fibers with photodeposited nanoparticles by sequentially switching on and off the lasers.
Review
Chemistry, Analytical
Dasheng Lu, Francisco Gamez, Patricia Haro-Gonzalez
Summary: In recent years, optically trapped luminescent particles have been used as reliable probes for contactless thermal sensing due to their luminescence dependence on environmental conditions. Despite temperature effects in optical trapping stability not always being the focus of study, disturbances caused by even a slight temperature increase in Brownian motion can hinder the optical trapping of micro/nanoparticles above room temperature and potentially lead to particle release from the trap. This report summarizes recent experimental results on thermal sensing using micro/nanoparticles as probes, aiming to provide an overview of the contemporary state of the art regarding temperature effects on the stability of potential trapping processes.
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
Optics
Liyong Cui, Neng Wang
Summary: This work investigates the trapping and self-assembly of particles by a single photonic chiral surface wave (PCSW) in a waveguide. It shows that PCSW can stably trap and assemble particles of arbitrary sizes, shapes, and dielectric constants. The unique properties of PCSW allow for independent particle trapping during the self-assembly process.
Article
Materials Science, Multidisciplinary
Evgeny N. Bulgakov, Almas F. Sadreev
Summary: In the first part of the paper, the authors demonstrate the sensitivity of equilibrium positions of small dielectric particles inside the Fabry-Perot resonator to the frequency and size of the incident electromagnetic wave. The second part discusses the interaction between nanoparticles and a long dielectric cylinder integrated into a metallic waveguide.
Article
Materials Science, Multidisciplinary
Shirui Zhang, Jingbo Ma, Peng Li, Ziheng Zhou, Yuzong Gu, Zhenkun Wu
Summary: Hexagonal optical lattices (HOLs) are formed by the coherent interference of three beams with oblique incidence. A theoretical model considering the orientation of three Gaussian beams is established to describe various patterns of HOLs, and the formula for the size and shape of HOLs is given. The nested Mach-Zehnder interferometer is used to generate HOLs experimentally, and the relationship between the geometry parameters of HOLs and the orientations of three beams is investigated numerically and experimentally. The experimentally generated HOLs can be accurately simulated using our theory. The study of HOLs generated by three-beam interference has applications in fabricating periodic structure modulations for the refractive index of nonlinear media or creating two-dimensional photonic crystals.
RESULTS IN PHYSICS
(2023)
Article
Astronomy & Astrophysics
Natalie Raettig, Wladimir Lyra, Hubert Klahr
Summary: Researchers utilized the PENCIL CODE to simulate 3D vortices generated by convective overstability and studied the trapping of solids within them. They found that even at extremely low dust-to-gas ratios, the vortices were still able to efficiently trap pebbles, indicating a potential pathway for planetesimal formation from extremely subsolar metallicity.
ASTROPHYSICAL JOURNAL
(2021)
Article
Optics
Fuxi Lu, Hao Wu, Yi Liang, Liu Tan, Zhifu Tan, Xu Feng, Yi Hu, Yinxiao Xiang, Xubo Hu, Zhigang Chen, Jingjun Xu
Summary: The study introduces specially modulated autofocusing beams with improved trapping capabilities compared to unmodulated beams, particularly the Bessel-modulated beam showing enhanced optical trapping force. These modulated beams have the potential to serve as new photonic tools for optical trapping and manipulation, outperforming conventional circular Airy beams in optical tweezers applications.
Article
Optics
Andrew Banas, Einstom Engay, Ada-Ioana Bunea, Stephen Daedalus Separa, Jesper Gluckstad
OPTICS COMMUNICATIONS
(2019)
Article
Biochemical Research Methods
Ada-Ioana Bunea, Manto Chouliara, Stine Harloff-Helleber, Andrew R. Banas, Einstom L. Engay, Jesper Gluckstad
JOURNAL OF BIOMEDICAL OPTICS
(2019)
Review
Optics
Ada-Ioana Bunea, Jesper Gluckstad
LASER & PHOTONICS REVIEWS
(2019)
Article
Optics
Einstom Engay, Andrew Banas, Ada-Ioana Bunea, Stephen Daedalus Separa, Jesper Gluckstad
OPTICS COMMUNICATIONS
(2019)
Article
Optics
Andreas Erik Gejl Madsen, Rene Lynge Eriksen, Jesper Gluckstad
Summary: This study examines the use of a Convolutional Neural Network for generating digital holograms and compares it to state-of-the-art iterative methods. While the neural network outperforms the original GS algorithm in reconstruction quality, it lags behind in speed compared to modern optimized GS implementations.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Andreas Gejl Madsen, Jesper Gluckstad
Summary: This paper presents a novel approach called HoloTile for rapid and speckle-reduced hologram generation. HoloTile uses an analytic method to modify the Point Spread Function (PSF) of the holographic system into flat-top squares in order to prevent interference between adjacent random phase values. The PSF shape is determined by the inter-spectral spacing in the reconstruction plane, which is caused by tiling on the spatial light modulator. As a result, the final hologram is obtained by multiplying the once-calculated PSF shaping phase hologram with the tiled object holograms. HoloTile achieves speckle-reduced reconstructions and extremely fast hologram generation due to the high resolution of the object holograms.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Andreas Erik Gejl Madsen, Mohammad Aryaee Panah, Peter Emil Larsen, Frank Nielsen, Jesper Gluckstad
Summary: Digital holographic microscopy (DHM) is an imaging technique that reconstructs three-dimensional images from holographic data. This review paper provides an overview of on-axis DHM reconstruction methods, which can be classified into direct, iterative, and machine learning based algorithms. Direct methods are fast but suffer from noise and low contrast, while iterative methods improve accuracy and noise reduction at the cost of increased complexity. Machine learning based methods achieve similar results to iterative methods in less time, but require computational resources and training data.
OPTICS COMMUNICATIONS
(2023)
Proceedings Paper
Optics
Jesper Gluckstad
Summary: We propose the concept of Light Robotics, which involves using light-driven micro/nano robotic tools that can be manipulated and controlled like micro-drones in a three-dimensional space. To explore the full potential of this toolset in challenging microscopic geometries, a versatile and real-time reconfigurable light addressing method is required to dynamically track multiple tools and ensure continuous optimal light coupling.
COMPLEX LIGHT AND OPTICAL FORCES XVI
(2022)
Proceedings Paper
Optics
Andreas Gejl Madsen, Rene Eriksen, Jesper Gluckstad
Summary: This study compares a trained Convolutional Neural Network (CNN) with state-of-the-art iterative methods for digital hologram generation. The CNN outperforms the original Gerchberg-Saxton (GS) algorithm in terms of generation speed, but lags behind modern optimized GS implementations in terms of reconstruction quality.
COMPLEX LIGHT AND OPTICAL FORCES XVI
(2022)
Proceedings Paper
Optics
Andreas Gejl Madsen, Jesper Gluckstad
Summary: This paper explores the governing parameters of Gaussian to flat top beam shaping through simulation. It demonstrates the existence of optimal parameter values for a given beam shaping configuration, and the significant impact of deviation from these values on the homogeneity and precision of the output square. By performing a 3D parameter sweep, the best performing parameters are expressed in a single parameterized equation.
COMPLEX LIGHT AND OPTICAL FORCES XVI
(2022)
Proceedings Paper
Optics
Antonio Astorino, Andrew R. Banas, Karsten Rottwitt, Jesper Gluckstad
COMPLEX LIGHT AND OPTICAL FORCES XIII
(2019)
Article
Engineering, Electrical & Electronic
Ada-Ioana Bunea, Mogens Havsteen Jakobsen, Einstom Engay, Andrew R. Banas, Jesper Gluckstad
MICRO AND NANO ENGINEERING
(2019)
Proceedings Paper
Nanoscience & Nanotechnology
Einstom Engay, Ada-Ioana Bunea, Andrew Rafael Banas, Manto Chouliara, Jesper Gluckstad
ADVANCED MANUFACTURING TECHNOLOGIES FOR MICRO- AND NANOSYSTEMS IN SECURITY AND DEFENCE
(2018)
Proceedings Paper
Optics
Jesper Gluckstad, Andrew Banas
LASER BEAM SHAPING XVIII
(2018)
Proceedings Paper
Nanoscience & Nanotechnology
Ada-Ioana Bunea, Einstom L. Engay, Manto Chouliara, Andrew R. Banas, Jesper Glckstad
ADVANCED MANUFACTURING TECHNOLOGIES FOR MICRO- AND NANOSYSTEMS IN SECURITY AND DEFENCE
(2018)
