Articles de revues sur le sujet « Magnetic Tweezing »

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1

Timonen, Jaakko V. I., et Bartosz A. Grzybowski. « Tweezing of Magnetic and Non-Magnetic Objects with Magnetic Fields ». Advanced Materials 29, no 18 (15 février 2017) : 1603516. http://dx.doi.org/10.1002/adma.201603516.

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Martinez-Pedrero, Fernando, Arthur V. Straube, Tom H. Johansen et Pietro Tierno. « Functional colloidal micro-sieves assembled and guided above a channel-free magnetic striped film ». Lab on a Chip 15, no 7 (2015) : 1765–71. http://dx.doi.org/10.1039/c5lc00067j.

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Sorting in motion: magnetic colloids driven above a channel-free magnetic substrate can be readily assembled into one-dimensional chains capable of performing sophisticated lab-on-a-chip functions, including trapping, sorting and tweezing.
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Timonen, Jaakko V. I., Ahmet F. Demirörs et Bartosz A. Grzybowski. « Magnetic Tweezers : Magnetofluidic Tweezing of Nonmagnetic Colloids (Adv. Mater. 18/2016) ». Advanced Materials 28, no 18 (mai 2016) : 3413. http://dx.doi.org/10.1002/adma.201670121.

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Froltsov, V. A., C. N. Likos et H. Löwen. « Colloids in inhomogeneous external magnetic fields : particle tweezing, trapping and void formation ». Journal of Physics : Condensed Matter 16, no 38 (11 septembre 2004) : S4103—S4114. http://dx.doi.org/10.1088/0953-8984/16/38/025.

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Probst, Roland, et Benjamin Shapiro. « Three-dimensional electrokinetic tweezing : device design, modeling, and control algorithms ». Journal of Micromechanics and Microengineering 21, no 2 (27 janvier 2011) : 027004. http://dx.doi.org/10.1088/0960-1317/21/2/027004.

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Shon, Min Ju, Sang-Hyun Rah et Tae-Young Yoon. « Submicrometer elasticity of double-stranded DNA revealed by precision force-extension measurements with magnetic tweezers ». Science Advances 5, no 6 (juin 2019) : eaav1697. http://dx.doi.org/10.1126/sciadv.aav1697.

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Submicrometer elasticity of double-stranded DNA (dsDNA) governs nanoscale bending of DNA segments and their interactions with proteins. Single-molecule force spectroscopy, including magnetic tweezers (MTs), is an important tool for studying DNA mechanics. However, its application to short DNAs under 1 μm is limited. We developed an MT-based method for precise force-extension measurements in the 100-nm regime that enables in situ correction of the error in DNA extension measurement, and normalizes the force variability across beads by exploiting DNA hairpins. The method reduces the lower limit of tractable dsDNA length down to 198 base pairs (bp) (67 nm), an order-of-magnitude improvement compared to conventional tweezing experiments. Applying this method and the finite worm-like chain model we observed an essentially constant persistence length across the chain lengths studied (198 bp to 10 kbp), which steeply depended on GC content and methylation. This finding suggests a potential sequence-dependent mechanism for short-DNA elasticity.
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Cho, Soo Kyung, Soojung Kim, Tae Young Kang, Hyung Kook Kim, Kyujung Kim et Yoon Hwae Hwang. « Controlled in situ capacitance sensing of single cell via simultaneous optical tweezing ». Sensors and Actuators B : Chemical 321 (octobre 2020) : 128512. http://dx.doi.org/10.1016/j.snb.2020.128512.

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Jia, Chenglong, Decheng Ma, Alexander F. Schäffer et Jamal Berakdar. « Twisting and tweezing the spin wave : on vortices, skyrmions, helical waves, and the magnonic spiral phase plate ». Journal of Optics 21, no 12 (14 novembre 2019) : 124001. http://dx.doi.org/10.1088/2040-8986/ab4f8e.

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BRASSELET, E., et S. JUODKAZIS. « OPTICAL ANGULAR MANIPULATION OF LIQUID CRYSTAL DROPLETS IN LASER TWEEZERS ». Journal of Nonlinear Optical Physics & ; Materials 18, no 02 (juin 2009) : 167–94. http://dx.doi.org/10.1142/s0218863509004580.

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The high sensitivity of liquid crystals to external fields, especially electromagnetic fields, confer to them fascinating properties. In the case of light fields, their large optical nonlinearities over a broad spectrum have great application potential for all-optical devices. The linear optical properties of liquid crystals, such as their high refractive index, birefringence and transparency, are also of great practical interest in optofluidics, which combines the use of optical tools in microfluidic environments. A representative example is the laser micromanipulation of liquid crystalline systems using optical tweezing techniques. Liquid crystal droplets represent a class of systems that can be easily prepared and manipulated by light, with or without a nonlinear light-matter coupling. Here we review different aspects of quasi-statics and dynamical optical angular manipulation of liquid crystal droplets trapped in laser tweezers. In particular, we discuss to the influence of the phase (nematic, cholesteric or smectic), the bulk ordering symmetry, the droplet size, the polarization state and power of the trapping light, together with the prominent role of light–matter angular momentum exchanges and optical orientational nonlinearities.
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Shen, Yijie. « Rays, waves, SU(2) symmetry and geometry : toolkits for structured light ». Journal of Optics 23, no 12 (22 novembre 2021) : 124004. http://dx.doi.org/10.1088/2040-8986/ac3676.

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Abstract Structured light refers to the ability to tailor optical patterns in all its degrees of freedom, from conventional 2D transverse patterns to exotic forms of 3D, 4D, and even higher-dimensional modes of light, which break fundamental paradigms and open new and exciting applications for both classical and quantum scenarios. The description of diverse degrees of freedom of light can be based on different interpretations, e.g. rays, waves, and quantum states, that are based on different assumptions and approximations. In particular, recent advances highlighted the exploiting of geometric transformation under general symmetry to reveal the ‘hidden’ degrees of freedom of light, allowing access to higher dimensional control of light. In this tutorial, I outline the basics of symmetry and geometry to describe light, starting from the basic mathematics and physics of SU(2) symmetry group, and then to the generation of complex states of light, leading to a deeper understanding of structured light with connections between rays and waves, quantum and classical. The recent explosion of related applications are reviewed, including advances in multi-particle optical tweezing, novel forms of topological photonics, high-capacity classical and quantum communications, and many others, that, finally, outline what the future might hold for this rapidly evolving field.
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Tian, Yu-Kui, Zhi-Shuai Yang, Xiao-Qin Lv, Ri-Sheng Yao et Feng Wang. « Construction of supramolecular hyperbranched polymers via the “tweezering directed self-assembly” strategy ». Chemical Communications 50, no 67 (9 juillet 2014) : 9477. http://dx.doi.org/10.1039/c4cc03158j.

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Dearing, M. T., et G. C. Spalding. « Fabrication of Isolated Nanoparticle Circuitry Via Lensless Optical Tweezing (“L. O. T. s”) ». MRS Proceedings 584 (1999). http://dx.doi.org/10.1557/proc-584-325.

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AbstractWe propose a novel method for trapping a nanometer-scale particle into a stable structure useful for a variety of interesting electrical measurements. The particle to be trapped can be dielectric or metallic, magnetic or non-magnetic. Our methodology was developed, in part, to ensure the absence of extraneous nanoparticles in the region of the device under test; it also allows a possible feedback mechanism to indicate when a nanoparticle has been successfully trapped. In particular, we irradiate a substrate containing a tiny etch-pit hole. On the transmission side of the substrate, the diffracted or evanescent optical fields should contain large enough gradients to localize a nanoparticle to the region of the hole.
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Wang, Xi-Guang, Levan Chotorlishvili, Vitalii K. Dugaev, Arthur Ernst, Igor V. Maznichenko, Nikita Arnold, Chenglong Jia, Jamal Berakdar, Ingrid Mertig et Józef Barnaś. « The optical tweezer of skyrmions ». npj Computational Materials 6, no 1 (18 septembre 2020). http://dx.doi.org/10.1038/s41524-020-00402-7.

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Abstract In a spin-driven multiferroic system, the magnetoelectric coupling has the form of effective dynamical Dzyaloshinskii–Moriya (DM) interaction. Experimentally, it is confirmed, for instance, for Cu2OSeO3, that the DM interaction has an essential role in the formation of skyrmions, which are topologically protected magnetic structures. Those skyrmions are very robust and can be manipulated through an electric field. The external electric field couples to the spin-driven ferroelectric polarization and the skyrmionic magnetic texture emerged due to the DM interaction. In this work, we demonstrate the effect of optical tweezing. For a particular configuration of the external electric fields it is possible to trap or release the skyrmions in a highly controlled manner. The functionality of the proposed tweezer is visualized by micromagnetic simulations and model analysis.
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Ali, Rfaqat, Rafael de Sousa Dutra, Felipe Arruda Pinheiro et Paulo Americo Maia Neto. « Gain-assisted optical tweezing of plasmonic and large refractive index microspheres ». Journal of Optics, 31 août 2021. http://dx.doi.org/10.1088/2040-8986/ac228f.

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15

Forbes, Andrew. « Perspectives on the Orbital Angular Momentum of Light ». Journal of Optics, 8 novembre 2022. http://dx.doi.org/10.1088/2040-8986/aca109.

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Abstract Orbital angular momentum (OAM) has been known and understood in mechanical systems for centuries, but far less venerable in optical systems. It was only 30 years ago that OAM was directly associated with the spatial structure of light, specifically its phase structure, allowing OAM carrying light to be routinely created in optical laboratories. The explosion in activity since then has been startling, with OAM finding applications in microscopy, imaging, metrology and sensing, optical trapping and tweezing, communication and quantum science. Many of these advances have been reported in this very journal, and so it is fitting that the Journal of Optics should have a special issue dedicated to the topic, celebrating 30 years of advances with a collection that includes original work, reviews and tutorials, covering the past, present while pointing to an exciting future.
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Mintairov, Alexander M., Dmitrii V. Lebedev, Alexei S. Vlasov, Alexei O. Orlov, Gregory L. Snider et Steven A. Blundell. « Nano-photoluminescence of natural anyon molecules and topological quantum computation ». Scientific Reports 11, no 1 (2 novembre 2021). http://dx.doi.org/10.1038/s41598-021-00859-6.

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AbstractThe proposal of fault-tolerant quantum computations, which promise to dramatically improve the operation of quantum computers and to accelerate the development of the compact hardware for them, is based on topological quantum field theories, which rely on the existence in Nature of physical systems described by a Lagrangian containing a non-Abelian (NA) topological term. These are solid-state systems having two-dimensional electrons, which are coupled to magnetic-flux-quanta vortexes, forming complex particles, known as anyons. Topological quantum computing (TQC) operations thus represent a physical realization of the mathematical operations involving NA representations of a braid group Bn, generated by a set of n localized anyons, which can be braided and fused using a “tweezer” and controlled by a detector. For most of the potential TQC material systems known so far, which are 2D-electron–gas semiconductor structure at high magnetic field and a variety of hybrid superconductor/topological-material heterostructures, the realization of anyon localization versus tweezing and detecting meets serious obstacles, chief among which are the necessity of using current control, i.e., mobile particles, of the TQC operations and high density electron puddles (containing thousands of electrons) to generate a single vortex. Here we demonstrate a novel system, in which these obstacles can be overcome, and in which vortexes are generated by a single electron. This is a ~ 150 nm size many electron InP/GaInP2 self-organized quantum dot, in which molecules, consisting of a few localized anyons, are naturally formed and exist at zero external magnetic field. We used high-spatial-resolution scanning magneto-photoluminescence spectroscopy measurements of a set of the dots having five and six electrons, together with many-body quantum mechanical calculations to demonstrate spontaneous formation of the anyon magneto-electron particles (eν) having fractional charge ν = n/k, where n = 1–4 and k = 3–15 are the number of electrons and vortexes, respectively, arranged in molecular structures having a built-in (internal) magnetic field of 6–12 T. Using direct imaging of the molecular configurations we observed fusion and braiding of eν-anyons under photo-excitation and revealed the possibility of using charge sensing for their control. Our investigations show that InP/GaInP2 anyon-molecule QDs, which have intrinsic transformations of localized eν-anyons compatible with TQC operations and capable of being probed by charge sensing, are very promising for the realization of TQC.
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