Articoli di riviste: "Optical field manipulation"

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Zhao, Xiaoting, Nan Zhao, Yang Shi, Hongbao Xin e Baojun Li. "Optical Fiber Tweezers: A Versatile Tool for Optical Trapping and Manipulation". Micromachines 11, n. 2 (21 gennaio 2020): 114. http://dx.doi.org/10.3390/mi11020114.

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Optical trapping is widely used in different areas, ranging from biomedical applications, to physics and material sciences. In recent years, optical fiber tweezers have attracted significant attention in the field of optical trapping due to their flexible manipulation, compact structure, and easy fabrication. As a versatile tool for optical trapping and manipulation, optical fiber tweezers can be used to trap, manipulate, arrange, and assemble tiny objects. Here, we review the optical fiber tweezers-based trapping and manipulation, including dual fiber tweezers for trapping and manipulation, single fiber tweezers for trapping and single cell analysis, optical fiber tweezers for cell assembly, structured optical fiber for enhanced trapping and manipulation, subwavelength optical fiber wire for evanescent fields-based trapping and delivery, and photothermal trapping, assembly, and manipulation.

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Shi, Yuzhi, Qinghua Song, Ivan Toftul, Tongtong Zhu, Yefeng Yu, Weiming Zhu, Din Ping Tsai, Yuri Kivshar e Ai Qun Liu. "Optical manipulation with metamaterial structures". Applied Physics Reviews 9, n. 3 (settembre 2022): 031303. http://dx.doi.org/10.1063/5.0091280.

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Optical tweezers employing forces produced by light underpin important manipulation tools employed in numerous areas of applied and biological physics. Conventional optical tweezers are widely based on refractive optics, and they require excessive auxiliary optical elements to reshape both amplitude and phase, as well as wavevector and angular momentum of light, and thus impose limitations on the overall cost and integration of optical systems. Metamaterials can provide both electric and optically induced magnetic responses in subwavelength optical structures, and they are highly beneficial to achieve unprecedented control of light required for many applications and can open new opportunities for optical manipulation. Here, we review the recent advances in the field of optical manipulation employing the physics and concepts of metamaterials and demonstrate that metamaterial structures could not only help to advance classical operations such as trapping, transporting, and sorting of particles, but they can uncover exotic optical forces such as pulling and lateral forces. In addition, apart from optical manipulation of particles (that can also be called “meta-tweezers”), metamaterials can be powered dynamically by light to realize ingenious “meta-robots.” This review culminates with an outlook discussing future novel opportunities in this recently emerged field ranging from enhanced particle manipulation to meta-robot actuation.

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Ruiz-Cortés, Victor, e Juan P. Vite-Frías. "Lensless optical manipulation with an evanescent field". Optics Express 16, n. 9 (24 aprile 2008): 6600. http://dx.doi.org/10.1364/oe.16.006600.

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Wang, Shuai, Xuewei Wang, Fucheng You e Han Xiao. "Review of Ultrasonic Particle Manipulation Techniques: Applications and Research Advances". Micromachines 14, n. 8 (25 luglio 2023): 1487. http://dx.doi.org/10.3390/mi14081487.

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Ultrasonic particle manipulation technique is a non-contact label-free method for manipulating micro- and nano-scale particles using ultrasound, which has obvious advantages over traditional optical, magnetic, and electrical micro-manipulation techniques; it has gained extensive attention in micro-nano manipulation in recent years. This paper introduces the basic principles and manipulation methods of ultrasonic particle manipulation techniques, provides a detailed overview of the current mainstream acoustic field generation methods, and also highlights, in particular, the applicable scenarios for different numbers and arrangements of ultrasonic transducer devices. Ultrasonic transducer arrays have been used extensively in various particle manipulation applications, and many sound field reconstruction algorithms based on ultrasonic transducer arrays have been proposed one after another. In this paper, unlike most other previous reviews on ultrasonic particle manipulation, we analyze and summarize the current reconstruction algorithms for generating sound fields based on ultrasonic transducer arrays and compare these algorithms. Finally, we explore the applications of ultrasonic particle manipulation technology in engineering and biological fields and summarize and forecast the research progress of ultrasonic particle manipulation technology. We believe that this review will provide superior guidance for ultrasonic particle manipulation methods based on the study of micro and nano operations.

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Wang, Genwang, Ye Ding, Haotian Long, Yanchao Guan, Xiwen Lu, Yang Wang e Lijun Yang. "Simulation of Optical Nano-Manipulation with Metallic Single and Dual Probe Irradiated by Polarized Near-Field Laser". Applied Sciences 12, n. 2 (13 gennaio 2022): 815. http://dx.doi.org/10.3390/app12020815.

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Nano-manipulation technology, as a kind of “bottom-up” tool, has exhibited an excellent capacity in the field of measurement and fabrication on the nanoscale. Although variety manipulation methods based on probes and microscopes were proposed and widely used due to locating and imaging with high resolution, the development of non-contacted schemes for these methods is still indispensable to operate small objects without damage. However, optical manipulation, especially near-field trapping, is a perfect candidate for establishing brilliant manipulation systems. This paper reports about simulations on the electric and force fields at the tips of metallic probes irradiated by polarized laser outputted coming from a scanning near-field optical microscope probe. Distributions of electric and force field at the tip of a probe have proven that the polarized laser can induce nanoscale evanescent fields with high intensity, which arouse effective force to move nanoparticles. Moreover, schemes with dual probes are also presented and discussed in this paper. Simulation results indicate that different combinations of metallic probes and polarized lasers will provide diverse near-field and corresponding optical force. With the suitable direction of probes and polarization direction, the dual probe exhibits higher trapping force and wider effective wavelength range than a single probe. So, these results give more novel and promising selections for realizing optical manipulation in experiments, so that distinguished multi-functional manipulation systems can be developed.

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Annadhasan, Mari, Avulu Vinod Kumar, Jada Ravi, Evgeny Mamonov, Tatiana Murzina e Rajadurai Chandrasekar. "Magnetic Field–Assisted Manipulation of Polymer Optical Microcavities". Advanced Photonics Research 2, n. 4 (25 febbraio 2021): 2000146. http://dx.doi.org/10.1002/adpr.202000146.

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Rui, Guanghao, e Qiwen Zhan. "Trapping of resonant metallic nanoparticles with engineered vectorial optical field". Nanophotonics 3, n. 6 (1 dicembre 2014): 351–61. http://dx.doi.org/10.1515/nanoph-2014-0006.

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AbstractOptical trapping and manipulation using focused laser beams has emerged as a powerful tool in the biological and physical sciences. However, scaling this technique to metallic nanoparticles remains challenging due to the strong scattering force and optical heating effect. In this work, we propose a novel strategy to optically trap metallic nanoparticles even under the resonant condition using engineered optical field. The distribution of the optical forces can be tailored through optimizing the spatial distribution of a vectorial optical illumination to favour the stable trapping of a variety of metallic nanoparticles under various conditions. It is shown that this optical tweezers has the ability of generating negative scattering force and supporting stable three-dimensional trapping for gold nanoparticles at resonance while avoiding trap destabilization due to optical overheating. The technique presented in this work offers a versatile solution for trapping metallic nanoparticles and may open up new avenues for optical manipulation.

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Ahmed, Hammad, Hongyoon Kim, Yuebian Zhang, Yuttana Intaravanne, Jaehyuck Jang, Junsuk Rho, Shuqi Chen e Xianzhong Chen. "Optical metasurfaces for generating and manipulating optical vortex beams". Nanophotonics 11, n. 5 (10 gennaio 2022): 941–56. http://dx.doi.org/10.1515/nanoph-2021-0746.

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Abstract Optical vortices (OVs) carrying orbital angular momentum (OAM) have attracted considerable interest in the field of optics and photonics owing to their peculiar optical features and extra degree of freedom for carrying information. Although there have been significant efforts to realize OVs using conventional optics, it is limited by large volume, high cost, and lack of design flexibility. Optical metasurfaces have recently attracted tremendous interest due to their unprecedented capability in the manipulation of the amplitude, phase, polarization, and frequency of light at a subwavelength scale. Optical metasurfaces have revolutionized design concepts in photonics, providing a new platform to develop ultrathin optical devices for the realization of OVs at subwavelength resolution. In this article, we will review the recent progress in optical metasurface-based OVs. We provide a comprehensive discussion on the optical manipulation of OVs, including OAM superposition, OAM sorting, OAM multiplexing, OAM holography, and nonlinear metasurfaces for OAM generation and manipulation. The rapid development of metasurface for OVs generation and manipulation will play an important role in many relevant research fields. We expect that metasurface will fuel the continuous progress of wearable and portable consumer electronics and optics where low-cost and miniaturized OAM related systems are in high demand.

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Luo, Xiangang, Mingbo Pu, Fei Zhang, Mingfeng Xu, Yinghui Guo, Xiong Li e Xiaoliang Ma. "Vector optical field manipulation via structural functional materials: Tutorial". Journal of Applied Physics 131, n. 18 (14 maggio 2022): 181101. http://dx.doi.org/10.1063/5.0089859.

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Vector optical field (VOF) manipulation greatly extended the boundaries of traditional scalar optics over the past decades. Meanwhile, the newly emerging techniques enabled by structural functional optical materials have driven the research domain into the subwavelength regime, where abundant new physical phenomena and technologies have been discovered and exploited for practical applications. In this Tutorial, we outline the basic principles, methodologies, and applications of VOF via structural functional materials. Among various technical routes, we focus on the metasurface-based approaches, which show obvious advantages regarding the design flexibility, the compactness of systems, and the overall performances. Both forward and inverse design methods based on the rigorous solution of Maxwell's equations are presented, which provide a valuable basis for future researchers. Finally, we discuss the generalized optical laws and conventions based on VOF manipulation. The applications in optical imaging, communications, precision measurement, laser fabrication, etc. are highlighted.

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Berthelot, J., S. S. Aćimović, M. L. Juan, M. P. Kreuzer, J. Renger e R. Quidant. "Three-dimensional manipulation with scanning near-field optical nanotweezers". Nature Nanotechnology 9, n. 4 (2 marzo 2014): 295–99. http://dx.doi.org/10.1038/nnano.2014.24.

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Woods, D. M., Z. Li, C. Rosenblalt, P. Yager e P. E. Schoen. "Electric Field Manipulation of Phospholipid Tubules: Optical Birefringence Measurements". Molecular Crystals and Liquid Crystals Incorporating Nonlinear Optics 167, n. 1 (febbraio 1989): 1–6. http://dx.doi.org/10.1080/00268948908037157.

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Myers, R. C., M. H. Mikkelsen, J. M. Tang, A. C. Gossard, M. E. Flatté e D. D. Awschalom. "Zero-field optical manipulation of magnetic ions in semiconductors". Nature Materials 7, n. 3 (17 febbraio 2008): 203–8. http://dx.doi.org/10.1038/nmat2123.

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Pin, C., J. B. Jager, M. Tardif, E. Picard, E. Hadji, F. de Fornel e B. Cluzel. "Optical tweezing using tunable optical lattices along a few-mode silicon waveguide". Lab on a Chip 18, n. 12 (2018): 1750–57. http://dx.doi.org/10.1039/c8lc00298c.

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Jun, Young Chul, e Igal Brener. "Optical Manipulation with Plasmonic Beam Shaping Antenna Structures". Advances in OptoElectronics 2012 (26 agosto 2012): 1–6. http://dx.doi.org/10.1155/2012/595646.

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Near-field optical trapping of objects using plasmonic antenna structures has recently attracted great attention. However, metal nanostructures also provide a compact platform for general wavefront engineering of intermediate and far-field beams. Here, we analyze optical forces generated by plasmonic beam shaping antenna structures and show that they can be used for general optical manipulation such as guiding of a dielectric particle along a linear or curved trajectory. This removes the need for bulky diffractive optical components and facilitates the integration of optical force manipulation into a highly functional, compact system.

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Zhou, Hai-Tao, Shu-Yun Xie, Xin Li, Dan Wang, Bao-Dong Yang e Jun-Xiang Zhang. "Manipulation of optical nonreciprocity in hot atom-cavity system". Journal of Physics B: Atomic, Molecular and Optical Physics 54, n. 19 (6 ottobre 2021): 195001. http://dx.doi.org/10.1088/1361-6455/ac329f.

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Abstract Hot atoms can exhibit non-magnetic optical non-reciprocal transmission due to their chiral properties, which are characteristic of most alkali metal atoms. In fact, the nonreciprocity in hot atoms depends on the propagation direction of the coupling field due to the Doppler effect. Herein, the reciprocal to non-reciprocal conversion based on the single- and double-dark states is realized by controlling the bidirectional coupling fields in a three-level electromagnetically induced transparent medium coupled with a ring cavity. Tuning the frequency difference between the two coupling fields causes the multi-frequency-channel reciprocity and nonreciprocity manipulation to occur. The experimental proof can be applied to quantum communications and quantum networks, such as optical transistors, all-optical switching or routing and logic gate operation.

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Myers, R. C., M. H. Mikkelsen, J. M. Tang, A. C. Gossard, M. E. Flatté e D. D. Awschalom. "Erratum: Zero-field optical manipulation of magnetic ions in semiconductors". Nature Materials 7, n. 4 (21 febbraio 2008): 339. http://dx.doi.org/10.1038/nmat2158.

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Li Jianping, 李建平, 刘洁 Liu Jie, 高社成 Gao Shecheng, 余思远 Yu Siyuan e 李朝晖 Li Zhaohui. "Manipulation and Transmission Technologies of Optical Field for Multidimensional Multiplexing Optical Fiber Communication". Acta Optica Sinica 39, n. 1 (2019): 0126008. http://dx.doi.org/10.3788/aos201939.0126008.

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Ohtsu, M., K. Kobayashi, H. Ito e Geun-Hyoung Lee. "Nanofabrication and atom manipulation by optical near-field and relevant quantum optical theory". Proceedings of the IEEE 88, n. 9 (settembre 2000): 1499–518. http://dx.doi.org/10.1109/5.883321.

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Qi, Bote, Lihua Shen, Khian-Hooi Chew e Rui-Pin Chen. "Vectorial Manipulation of High-Resolution Focusing Optical Field through a Scattering Medium". Photonics 9, n. 10 (8 ottobre 2022): 737. http://dx.doi.org/10.3390/photonics9100737.

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The manipulation of the polarization states of the light transmitted through a scattering medium has become an emerging field due to the novel fundamental physics interest and potential applications. Here, the manipulation of the polarization states in the focusing high-resolution optical field (points and vector beams) after passing a scattering medium is theoretically and experimentally demonstrated. The vector transmission matrix (VTM) of a scattering medium is measured with the vector basis of orthogonally circular polarizations by the two-dimensional (2D) holographic grating combined with the four-step phase-shifting method. The incident wavefronts for the creation of desired high-resolution optical fields through a scattering medium are modulated according to the calculation with the VTM of the medium. The theoretical and experimental results show that the constructed high-resolution optical field with spatially variant states of polarization can be realized through frosted glass. These results provide a new way to vectorially manipulate the constructed high-resolution optical field by passing through a scattering medium.

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Liu, B. H., L. J. Yang, Y. Wang e J. L. Yuan. "Nano-manipulation performance with enhanced evanescent field close to near-field optical probes". Optics Communications 284, n. 12 (giugno 2011): 3039–46. http://dx.doi.org/10.1016/j.optcom.2011.02.023.

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Liu, Bing Hui, Li Jun Yang, J. Tang, Yang Wang e Ju Long Yuan. "Analysis of the Nanoscale Manipulation Using Near-Field Optical Tweezers Combined with AFM Probe". Advanced Materials Research 188 (marzo 2011): 184–89. http://dx.doi.org/10.4028/www.scientific.net/amr.188.184.

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In recent years, optical manipulators based on forces exerted by enhanced evanescent field close to near-field optical probes have provided the access to nonintrusive manipulation of nanometric particles. However, the manipulation capability is restricted to the intensity enhancement of the probe tip due to low emitting efficiency. Here a near-field optical trapping scheme using the combination of an optical fiber probe and an AFM metallic probe is developed theoretically. Calculations are made to analyze the field distributions including tip interaction and the trapping forces in the near-field region by applying a direct calculation of Maxwell stress tensor using three-dimensional FDTD. The results show that the scheme is able to trap particle at the nanoscale with lower laser intensity than that required by conventional near-field optical tweezers.

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Kuo, Hsin Yu, Sunil Vyas, Cheng Hung Chu, Mu Ku Chen, Xu Shi, Hiroaki Misawa, Yu-Jung Lu, Yuan Luo e Din Ping Tsai. "Cubic-Phase Metasurface for Three-Dimensional Optical Manipulation". Nanomaterials 11, n. 7 (30 giugno 2021): 1730. http://dx.doi.org/10.3390/nano11071730.

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The optical tweezer is one of the important techniques for contactless manipulation in biological research to control the motion of tiny objects. For three-dimensional (3D) optical manipulation, shaped light beams have been widely used. Typically, spatial light modulators are used for shaping light fields. However, they suffer from bulky size, narrow operational bandwidth, and limitations of incident polarization states. Here, a cubic-phase dielectric metasurface, composed of GaN circular nanopillars, is designed and fabricated to generate a polarization-independent vertically accelerated two-dimensional (2D) Airy beam in the visible region. The distinctive propagation characteristics of a vertically accelerated 2D Airy beam, including non-diffraction, self-acceleration, and self-healing, are experimentally demonstrated. An optical manipulation system equipped with a cubic-phase metasurface is designed to perform 3D manipulation of microscale particles. Due to the high-intensity gradients and the reciprocal propagation trajectory of Airy beams, particles can be laterally shifted and guided along the axial direction. In addition, the performance of optical trapping is quantitatively evaluated by experimentally measured trapping stiffness. Our metasurface has great potential to shape light for compact systems in the field of physics and biological applications.

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Tang, Gao, Chunyan Bai, Yuxing Zhang, Zhening Zhao e Dawei Zhang. "Simulation Study of Localized, Multi-Directional Continuous Dynamic Tailoring for Optical Skyrmions". Photonics 11, n. 6 (24 maggio 2024): 499. http://dx.doi.org/10.3390/photonics11060499.

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The topological properties of optical skyrmions have enormous application value in fields such as optical communication and polarization sensing. At present, research on optical skyrmions focuses primarily on the topological principles of skyrmions and their applications. Nonetheless, extant research devoted to skyrmion-array manipulation remains meager. The sole manipulation scheme has a limited effect on the movement direction of the whole skyrmion array. Based on the interference principle of the surface plasmon polariton (SPP) wave, we propose an upgraded scheme for the tailoring of electric-field optical skyrmions. A distributed Gaussian-focused spots array is deployed. Unlike the existing manipulation, we customize the phase of the light source to be more flexible, and we have discovered optical-skyrmion tailoring channels and shaping channels. Specifically, we move the skyrmions within the channel in both directions and manipulate the shape of the topological domain walls to achieve customized transformation. This work will evolve towards a more flexible regulatory plan for tailoring optical-skyrmion arrays, and this is of great significance for research in fields such as optical storage and super-resolution microimaging.

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Askar, Sh, D. J. Jasim, A. H. Al-Rubaye, O. F. Shavkatjon Ugli, R. Singh, A. Kumar, A. R. Al-Tameemi, C. Rodriguez-Benites, E. R. Alwaily e A. Alawadi. "Dynamics of induced optical torque via optical vortex light". Laser Physics Letters 21, n. 6 (18 aprile 2024): 065203. http://dx.doi.org/10.1088/1612-202x/ad3cbf.

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Abstract This paper investigates the dynamics of induced torque in Nitrogen-Vacancy (NV) centers interacting with two weak optical vortex beams as well as a strong control field, exploring the impact of different system parameters such as control field intensity, detuning, magnetic field, and vortex beam strength. We find a dispersive torque behavior, indicating the sensitivity of NV centers to control parameters. Magnetic field induces level splitting, leading to a transformative effect on torque, with notable enhancements observed at specific intensities. Additionally, non-resonant torque is explored, demonstrating the controllability of torque peaks through magnetic field manipulation. Unequal strengths of vortex beams is found to yield substantial enhancements in torque. These results provide crucial insights into the induced torque dynamics in NV centers, presenting opportunities for optimized torque-based applications in quantum systems.

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Saleh, R. O., M. S. Mohammed, S. Askar, N. S. A. Darwish, W. R. Kadhum, M. L. Shaghnab, A. A. Ibrahim, A. Kumar, A. Elawady e A. A. Omran. "Spatially varying optical characteristics in quantum-dot molecules through interdot tunneling". Laser Physics Letters 21, n. 4 (15 febbraio 2024): 045202. http://dx.doi.org/10.1088/1612-202x/ad26ed.

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Abstract In this paper, we investigate the spatially dependent absorption characteristics in structurally asymmetric quantum-dot molecules (QDMs), characterized by four energy levels interacting with position-dependent beams and varying system parameters. We explore the effects of detuning, standing wave intensity, and the relative phase of applied fields on the absorption patterns within the medium. A diverse array of patterns emerges, including cross-like structures, ring-like formations, and localized absorption maxima, illustrating the intricate interplay between these parameters and the spatial distribution of absorption features. The introduction of a vortex-shaped control field adds a new dimension to the study, revealing azimuthal dependence and providing a novel perspective for manipulating absorption and gain properties based on the orbital angular momentum of the control field. This work contributes to a comprehensive understanding of the intricate dynamics governing spatially dependent absorption in QDMs, offering valuable insights for controlled manipulation and practical applications in quantum systems.

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Peers, Christopher, e Chengxu Zhou. "Bimanual Telemanipulation Framework Utilising Multiple Optically Localised Cooperative Mobile Manipulators". Robotics 13, n. 4 (1 aprile 2024): 59. http://dx.doi.org/10.3390/robotics13040059.

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Bimanual manipulation is valuable for its potential to provide robots in the field with increased capabilities when interacting with environments, as well as broadening the number of possible manipulation actions available. However, for a robot to perform bimanual manipulation, the system must have a capable control framework to localise and generate trajectories and commands for each sub-system to allow for successful cooperative manipulation as well as sufficient control over each individual sub-system. The proposed method suggests using multiple mobile manipulator platforms coupled through the use of an optical tracking localisation method to act as a single bimanual manipulation system. The framework’s performance relies on the accuracy of the localisation. As commands are primarily high-level, it is possible to use any number and combination of mobile manipulators and fixed manipulators within this framework. We demonstrate the functionality of this system through tests in a Pybullet simulation environment using two different omnidirectional mobile manipulators, as well a real-life experiment using two quadrupedal manipulators.

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Qu, Yan Li, Mei Juan Zheng, Wen Feng Liang e Zai Li Dong. "Fully Automatic Wafer-Scale Micro/Nano Manipulation Based on Optically Induced Dielectrophoresis". Advanced Materials Research 415-417 (dicembre 2011): 842–47. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.842.

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Optically induced dielectrophoresis (ODEP) has been proved experimentally as a powerful method for efficiently manipulating some micro-scale, or even nano-scale objects. However, few ODEP platforms have been demonstrated towards the fully automatic wafer-scale manipulation and rapid fabrication of micro and nano sensors and devices. That would be of great significance to the application and industrialization of micro and nano materials. In this paper, an innovative ODEP platform for reconfigurable and automatic micro/nano-scale material manipulation is presented by combining microactuation and microvision analysis with ODEP technology. The ODEP chip consists of a typical photoconductive layer of amorphous silicon, which generates a nonuniform electric field at the light-illuminated region to induce dielectrophoretic (DEP) force for manipulating particles within the chip. A high resolution 3D motorized stage enables an accurate and rapid movement of the chip in wafer-scale. The microvision analysis program automatically recognizes the positions and sizes of randomly distributed particles and creates direct image patterns to manipulate the selected particles to form a predetermined pattern in predesired position. The programmed dynamic reconfigurable optical patterns provide increased functionality and versatility in particle manipulation. The patterning of polystyrene beads with different sizes is accomplished. This platform may be promising for rapid and wafer-scale fabrication of micro and nano sensors and devices, high-throughput bio-sample pretreatment and other applications requiring massively parallel manipulation.

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Zhu, Kaiqi, Yilin Wu, Mengdi Li, Xiaofei Li, Yaru Gao e Xianlong Liu. "Flexible Construction of a Partially Coherent Optical Array". Photonics 11, n. 2 (31 gennaio 2024): 133. http://dx.doi.org/10.3390/photonics11020133.

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In this article, we introduce a flexible and programmable method to construct a multi-parameter optical array to meet urgent and personalized needs, such as multi-particle capture and manipulation and material processing, and enrich the degree of freedom when constructing an optical array. As an example, uniform and nonuniform spiral coherent lattices (SCLs) and their propagation properties are investigated both theoretically and experimentally. Various intensity distributions, e.g., a uniform and nonuniform spiral light field, can be achieved by manipulating the diverse parameters. Additionally, the complex degree of coherence exhibits phase singularities in the source plane, which can be used for constructing optical vortex beams.

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Lei, Haomai, Bin Luo, Jianfei Hu, Jiming Wang, Tong Wu e Youwen Liu. "Creation and manipulation of optical Meron topologies in tightly focused electromagnetic field". Journal of Optics 26, n. 6 (16 aprile 2024): 065001. http://dx.doi.org/10.1088/2040-8986/ad3b19.

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Abstract The optical topology, which serves as a stable spatial electromagnetic structure, offers a new dimension for applications in the field of optical information processing, transmission, and storage. In recent years, there has been an increasing focus on these spatially structured light fields. By reversing the radiation of orthogonal dipole pairs, we propose an approach to generate Meron topologies within the focused light field while also investigating the evolution of the Meron structure along the longitudinal axis. Through introducing a dipole placed along the z-axis, we achieve precise positioning and fine adjustment of the topological center. The stability of Meron under a high numerical aperture objective lens (NA = 0.95) can be effectively demonstrated.

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Bessonov, V. O., A. D. Rozanov e A. A. Fedyanin. "Optical Trapping and Moving of Microparticles by the Near Field of Bloch Surface Waves in Polymer Waveguides". JETP Letters 119, n. 4 (febbraio 2024): 261–66. http://dx.doi.org/10.1134/s0021364024600010.

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Trapping and movement of microparticles using the near field of waveguide modes enables the realization of stable and compact integrated optical platforms for manipulating, sorting, and studying single microobjects. In this work, the possibility of optical manipulation via Bloch surface waves propagating in polymer waveguides on the surface of a one-dimensional photonic crystal and localizing light at the waveguide surface is studied. Numerical simulation of optical forces acting on a spherical particle from the fundamental waveguide mode of the Bloch surface wave is performed. Using two-photon laser lithography, SU-8 polymer waveguides are fabricated on the surface of a one-dimensional photonic crystal. The movement of a polystyrene microparticle along the waveguide when the Bloch surface wave is excited in it is experimentally demonstrated.

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LIU Binghui, 刘炳辉, 杨立军 YANG Lijun, 王扬 WANG Yang e 袁巨龙 YUAN Julong. "Nanomanipulation of Nearfield Optical Tweezers Using a Fiber Probe". ACTA PHOTONICA SINICA 40, n. 3 (2011): 363–69. http://dx.doi.org/10.3788/gzxb20114003.0363.

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Hiltunen, Jussi, Sanna Uusitalo, Pentti Karioja, Stuart Pearce, Martin Charlton, Meng Wang, Jarkko Puustinen e Jyrki Lappalainen. "Manipulation of optical field distribution in layered composite polymeric-inorganic waveguides". Applied Physics Letters 98, n. 11 (14 marzo 2011): 111113. http://dx.doi.org/10.1063/1.3567756.

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Zang, Tianyang, Huiwen Luo, Yong Wang, Liang Wang, Yonghua Lu e Pei Wang. "Optical field manipulation by dual magnetic resonances of a silicon metasurface". Optics Letters 43, n. 15 (1 agosto 2018): 3782. http://dx.doi.org/10.1364/ol.43.003782.

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Turturici, A. A., J. Franc, R. Grill, V. Dědič, L. Abbene e F. Principato. "Electric field manipulation in Al/CdTe/Pt detectors under optical perturbations". Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 858 (giugno 2017): 36–43. http://dx.doi.org/10.1016/j.nima.2017.03.041.

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35

Ou, Kai, Hengyi Wan, Guangfeng Wang, Jingyuan Zhu, Siyu Dong, Tao He, Hui Yang, Zeyong Wei, Zhanshan Wang e Xinbin Cheng. "Advances in Meta-Optics and Metasurfaces: Fundamentals and Applications". Nanomaterials 13, n. 7 (30 marzo 2023): 1235. http://dx.doi.org/10.3390/nano13071235.

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Abstract (sommario):

Meta-optics based on metasurfaces that interact strongly with light has been an active area of research in recent years. The development of meta-optics has always been driven by human’s pursuits of the ultimate miniaturization of optical elements, on-demand design and control of light beams, and processing hidden modalities of light. Underpinned by meta-optical physics, meta-optical devices have produced potentially disruptive applications in light manipulation and ultra-light optics. Among them, optical metalens are most fundamental and prominent meta-devices, owing to their powerful abilities in advanced imaging and image processing, and their novel functionalities in light manipulation. This review focuses on recent advances in the fundamentals and applications of the field defined by excavating new optical physics and breaking the limitations of light manipulation. In addition, we have deeply explored the metalenses and metalens-based devices with novel functionalities, and their applications in computational imaging and image processing. We also provide an outlook on this active field in the end.

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Tang, Jing, Li Jun Yang, Bing Hui Liu e Yang Wang. "Nano-Particle Manipulated with Near-Field Optical Tweezers". Advanced Materials Research 299-300 (luglio 2011): 1068–71. http://dx.doi.org/10.4028/www.scientific.net/amr.299-300.1068.

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By applying the direct calculation of Maxwell stress tensor using three-dimensional finite difference time domain method, the feasibility of using a metal-coated fiber probe to create near-field optical tweezers is investigated. Numerical results indicate that these schemes are able to trap nano-particles with lower laser intensity than that required by conventional optical tweezers. The near-field optical trapping systems that are more flexible than conventional optical tweezers are built. In experiments, 120-nm polystyrene particles are trapped in a multi-circular shape with a minimum size of 400 nm. The realization of trapping particles in the range of tens of nanometers largely promotes the role of near-field optical manipulation at the nanometer scale.

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Zhang, Zhenglong. "Editorial for Special Issue “Plasmon Assisted Near-Field Manipulation and Photocatalysis”". Nanomaterials 13, n. 8 (21 aprile 2023): 1427. http://dx.doi.org/10.3390/nano13081427.

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38

Zhao, Chenglong, Jiasen Zhang e Yongmin Liu. "Light manipulation with encoded plasmonic nanostructures". EPJ Applied Metamaterials 1 (2014): 6. http://dx.doi.org/10.1051/epjam/2014006.

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Abstract (sommario):

Plasmonics, which allows for manipulation of light field beyond the fundamental diffraction limit, has recently attracted tremendous research efforts. The propagating surface plasmon polaritons (SPPs) confined on a metal-dielectric interface provide an ideal two-dimensional (2D) platform to develop subwavelength optical circuits for on-chip information processing and communication. The surface plasmon resonance of rationally designed metallic nanostructures, on the other hand, enables pronounced phase and polarization modulation for light beams travelling in three-dimensional (3D) free space. Flexible 2D and free-space propagating light manipulation can be achieved by encoding plasmonic nanostructures on a 2D surface, promising the design, fabrication and integration of the next-generation optical architectures with substantially reduced footprint. It is envisioned that the encoded plasmonic nanostructures can significantly expand available toolboxes for novel light manipulation. In this review, we presents the fundamentals, recent developments and future perspectives in this emerging field, aiming to open up new avenues to developing revolutionary photonic devices.

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Cheng, Lin, Xiaomingliang Li, Zelong Wang, Pengfei Cao, Xiaodong He e Tiaoming Niu. "AdjusTable 3D Plasmonic Archimedes Spiral Lens for Optical Manipulation". Applied Sciences 9, n. 4 (16 febbraio 2019): 674. http://dx.doi.org/10.3390/app9040674.

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A novel adjustable three-dimensional plasmonic Archimedes spiral lens (3D PASL) has been investigated and analyzed in detail by numerical simulations. The 3D PASL consists of a spiraling Archimedes helix slot that is engraved on the inner wall of a funnel-shaped gold film on a silicon dioxide substrate. When the incident light from the bottom of substrate is composed of left-hand circularly polarized (LCP) waves, the transmitted light field will converge completely to a focused point that floats in the hollow funnel. This light field will change into an optical vortex when the incident light is changed to right-hand circularly polarized (RCP) waves. The performance of our 3D PASL is discussed for particle trapping or rotation applications. In addition, the position of the optical focus or vortex can be adjusted by varying the height of the structure. Our 3D PASL is highly flexible for practical optical manipulation applications and overcomes the problem where the previous two-dimensional PASL could only manipulate particles on the surface.

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Eechampati, Arnith, e Chamaree de Silva. "Utilization of Optical Tweezer Nanotechnology in Membrane Interaction Studies". Applied Nano 3, n. 1 (7 febbraio 2022): 43–53. http://dx.doi.org/10.3390/applnano3010004.

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Optical tweezers have been a fixture of microscopic cell manipulation since the 1990s. Arthur Ashkin’s seminal work has led to the advancement of optical tweezers as an effective tool for assay development in the fields of physics and nanotechnology. As an advanced application of cell manipulation, optical tweezers have facilitated the study of a multitude of cellular and molecular interactions within the greater field of nanotechnology. In the three decades since the optical tweezers’ rise to prominence, different and versatile assays have emerged that further explore the biochemical pathways integral for cell proliferation and communication. The most critical organelle implicated in the communication and protection of single cells includes the plasma membrane. In the past three decades, novel assays have emerged which examine the plasma membrane’s role in cell-to-cell interaction and the specific protein components that serve integral membrane functions for the cell as a whole. To further understand the extent to which optical tweezers have evolved as a critical tool for cellular membrane assessment within the field of nanotechnology, the various novel assays, including pulling, indentation, and stretching assays, will be reviewed in the current research sector.

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Yang Bo, 杨渤, 程化 Cheng Hua, 陈树琪 Chen Shuqi e 田建国 Tian Jianguo. "Multi-Dimensional Manipulation of Optical Field by Metasurfaces Based on Fourier Analysis". Acta Optica Sinica 39, n. 1 (2019): 0126005. http://dx.doi.org/10.3788/aos201939.0126005.

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42

Rui, Guanghao, Xiaoyan Wang, Bing Gu, Qiwen Zhan e Yiping Cui. "Manipulation metallic nanoparticle at resonant wavelength using engineered azimuthally polarized optical field". Optics Express 24, n. 7 (25 marzo 2016): 7212. http://dx.doi.org/10.1364/oe.24.007212.

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Maurer, P. C., J. R. Maze, P. L. Stanwix, L. Jiang, A. V. Gorshkov, A. A. Zibrov, B. Harke et al. "Far-field optical imaging and manipulation of individual spins with nanoscale resolution". Nature Physics 6, n. 11 (19 settembre 2010): 912–18. http://dx.doi.org/10.1038/nphys1774.

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44

Darak, Mayur S., Rakesh G. Mote e Shobha Shukla. "Asymmetry‐Based Plasmonic Phase Manipulation for a Compact Far‐Field Optical Lens". Advanced Photonics Research 1, n. 2 (4 ottobre 2020): 2000018. http://dx.doi.org/10.1002/adpr.202000018.

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Xuan, Xiangchun. "Recent Advances in Continuous-Flow Particle Manipulations Using Magnetic Fluids". Micromachines 10, n. 11 (31 ottobre 2019): 744. http://dx.doi.org/10.3390/mi10110744.

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Magnetic field-induced particle manipulation is simple and economic as compared to other techniques (e.g., electric, acoustic, and optical) for lab-on-a-chip applications. However, traditional magnetic controls require the particles to be manipulated being magnetizable, which renders it necessary to magnetically label particles that are almost exclusively diamagnetic in nature. In the past decade, magnetic fluids including paramagnetic solutions and ferrofluids have been increasingly used in microfluidic devices to implement label-free manipulations of various types of particles (both synthetic and biological). We review herein the recent advances in this field with focus upon the continuous-flow particle manipulations. Specifically, we review the reported studies on the negative magnetophoresis-induced deflection, focusing, enrichment, separation, and medium exchange of diamagnetic particles in the continuous flow of magnetic fluids through microchannels.

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Kotnala, Abhay, Pavana Siddhartha Kollipara e Yuebing Zheng. "Opto-thermoelectric speckle tweezers". Nanophotonics 9, n. 4 (7 marzo 2020): 927–33. http://dx.doi.org/10.1515/nanoph-2019-0530.

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AbstractOpto-thermoelectric tweezers present a new paradigm for optical trapping and manipulation of particles using low-power and simple optics. New real-life applications of opto-thermoelectric tweezers in areas such as biophysics, microfluidics, and nanomanufacturing will require them to have large-scale and high-throughput manipulation capabilities in complex environments. Here, we present opto-thermoelectric speckle tweezers, which use speckle field consisting of many randomly distributed thermal hotspots that arise from an optical speckle pattern to trap multiple particles over large areas. By further integrating the speckle tweezers with a microfluidic system, we experimentally demonstrate their application for size-based nanoparticle filtration. With their low-power operation, simplicity, and versatility, opto-thermoelectric speckle tweezers will broaden the applications of optical manipulation techniques.

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47

Liu, Haigang, e Xianfeng Chen. "The manipulation of second-order nonlinear harmonic wave by structured material and structured light". Journal of Nonlinear Optical Physics & Materials 27, n. 04 (dicembre 2018): 1850047. http://dx.doi.org/10.1142/s0218863518500479.

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Nonlinear frequency conversion is the important method to get coherent radiation in all-optical waveband. The intentional manipulation of nonlinear harmonic wave, which has some special phase, amplitude, polarization, and so on, is also important to realize all kinds of optical micro-manipulation, optical micro-fabrication, and optical communication in all-optical waveband. There are three methods to manipulate such nonlinear harmonic wave, which are tailoring the functional facet, the structure of crystals, and the structure of the incident light. In this review, we will systematically introduce the fundamental principle and latest advances in this field and summarize the respective characteristics of these three methods.

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Zhang, Aiqin, Kunyang Li, Guorong Guan, Haowen Liang, Xiangsheng Xie e Jianying Zhou. "Far-Field Super-Resolution Optical Microscopy for Nanostructures in a Reflective Substrate". Photonics 11, n. 5 (27 aprile 2024): 409. http://dx.doi.org/10.3390/photonics11050409.

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The resolution of an optical microscope is determined by the overall point spread function of the system. When examining structures significantly smaller than the wavelength of light, the contribution of the background or surrounding environment can profoundly affect the point spread function. This research delves into the impact of reflective planar substrate structures on the system’s resolution. We establish a comprehensive forward imaging model for a reflection-type confocal laser scanning optical microscope, incorporating vector field manipulation to image densely packed nanoparticle clusters. Both theoretical and experimental findings indicate that the substrate causes an interference effect between the background field and the scattered field from the nanoparticles, markedly enhancing the overall spatial resolution. The integration of vector field manipulation with an interferometric scattering approach results in superior spatial resolution for imaging isolated particles and densely distributed nanoscale particle clusters even with deep subwavelength gaps as small as 20 nm between them. However, the method still struggles to resolve nanoparticles positioned directly next to each other without any gap, necessitating further work to enhance the resolving ability. This may involve techniques like deconvolution or machine learning-based post-processing methods.

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Zhang, Hao, Xinzhong Li, Haixiang Ma, Miaomiao Tang, Hehe Li e Yangjian Cai. "Centrosymmetric Optical Vortex". Applied Sciences 9, n. 7 (4 aprile 2019): 1429. http://dx.doi.org/10.3390/app9071429.

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We report on a novel optical vortex, named as centrosymmetric optical vortex (CSOV), which is constructed via four conventional optical vortices (OVs) with different topological charges (TCs). The orbital angular momentum (OAM) density satisfies centrosymmetric distribution. Meanwhile, it is confined within a single ring whose radius is determined by the cone angle of an axicon. Furthermore, its magnitude and distribution are modulated by a parameter determined via the TCs of the four OVs, named as phase reconstruction factor. Our work provides a novel detached asymmetric light field, which possesses the potential application in macro-particle manipulation, especially separating cells.

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Nishimoto, Kyohei, e Kozo Taguchi. "Combination of Au Dielectrophoresis Chip and Optical Tweezers for Cell Culture". Key Engineering Materials 656-657 (luglio 2015): 549–53. http://dx.doi.org/10.4028/www.scientific.net/kem.656-657.549.

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Dielectrophoresis (DEP) force will arise when an inhomogeneous AC electric field with sinusoidal wave is applied to microelectrodes. By using DEP, we could distinguish between viable and non-viable cells by their movement through a non-uniform electric field. In this paper, we propose a yeast cell separation system, which utilizes an Au DEP chip and an optical tweezers. The Au DEP chip is planar quadrupole microelectrodes, which were fabricated by Au thin-film and a box cutter. This fabrication method is low cost and simpler than previous existing methods. The tip of the optical tweezers was fabricated by dynamic chemical etching in a mixture of hydrogen fluoride and toluene. The optical tweezers has the feature of high manipulation performance. That does not require objective lens for focusing light because the tip of optical tweezers has conical shape. By using both the Au DEP chip and optical tweezers, we could obtain three-dimensional manipulation of specific cells after viability separation.

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