Bibliografie tematiche / Optical field manipulation

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Letteratura scientifica selezionata sul tema "Optical field manipulation"

Autore: Grafiati

Pubblicato: 9 novembre 2024

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Articoli di riviste sul tema "Optical field manipulation"

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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Più fonti

Tesi sul tema "Optical field manipulation"

Ganic, Djenan, e dga@rovsing dk. "Far-field and near-field optical trapping". Swinburne University of Technology. Centre for Micro-Photonics, 2005. http://adt.lib.swin.edu.au./public/adt-VSWT20051130.135436.

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Optical trapping techniques have become an important and irreplaceable tool in many research disciplines for reaching non-invasively into the microscopic world and to manipulate, cut, assemble and transform micro-objects with nanometer precision and sub-micrometer resolution. Further advances in optical trapping techniques promise to bridge the gap and bring together the macroscopic world and experimental techniques and applications of Microsystems in areas of physics, chemistry and biology. In order to understand the optical trapping process and to improve and tailor experimental techniques and applications in a variety of scientific disciplines, an accurate knowledge of trapping forces exerted on particles and their dependency on environmental and morphological factors is of crucial importance. Furthermore, the recent trend in novel laser trapping experiments sees the use of complex laser beams in trapping arrangements for achieving more controllable laser trapping techniques. Focusing of such beams with a high numerical aperture (NA) objective required for efficient trapping leads to a complicated amplitude, phase and polarisation distributions of an electromagnetic field in the focal region. Current optical trapping models based on ray optics theory and the Gaussian beam approximation are inadequate to deal with such a focal complexity. Novel applications of the laser trapping such as the particle-trapped scanning near field optical microscopy (SNOM) and optical-trap nanometry techniques are currently investigated largely in the experimental sense or with approximated theoretical models. These applications are implemented using the efficient laser trapping with high NA and evanescent wave illumination of the sample for high resolution sensing. The proper study of these novel laser trapping applications and the potential benefits of implementation of these applications with complex laser beams requires an exact physical model for the laser trapping process and a nanometric sensing model for detection of evanescent wave scattering. This thesis is concerned with comprehensive and rigorous modelling and characterisation of the trapping process of spherical dielectric particles implemented using far-field and near-field optical trapping modalities. Two types of incident illuminations are considered, the plane wave illumination and the doughnut beam illumination of various topological charges. The doughnut beams represent one class of complex laser beams. However, our optical trapping model presented in this thesis is in no way restricted to this type of incident illumination, but is equally applicable to other types of complex laser beam illuminations. Furthermore, the thesis is concerned with development of a physical model for nanometric sensing, which is of great importance for optical trapping systems that utilise evanescent field illumination for achieving high resolution position monitoring and imaging. The nanometric sensing model, describing the conversion of evanescent photons into propagating photons, is realised using an analytical approach to evanescent wave scattering by a microscopic particle. The effects of an interface at which the evanescent wave is generated are included by considering the scattered field reflection from the interface. Collection and imaging of the resultant scattered field by a high numerical aperture objective is described using vectorial diffraction theory. Using our sensing model, we have investigated the dependence of the scattering on the particle size and refractive index, the effects of the interface on the scattering cross-section, morphology dependent resonance effects associated with the scattering process, and the effects of the incident angle of a laser beam undergoing total internal reflection to generate an evanescent field. Furthermore, we have studied the detectability of the scattered signal using a wide area detector and a pinhole detector. A good agreement between our experimental measurements of the focal intensity distribution in the back focal region of the collecting objective and the theoretical predictions confirm the validity of our approach. The optical trapping model is implemented using a rigorous vectorial diffraction theory for characterisation of the electromagnetic field distribution in the focal region of a high NA objective. It is an exact model capable of considering arbitrary amplitude, phase and polarisation of the incident laser beam as well as apodisation functions of the focusing objective. The interaction of a particle with the complex focused field is described by an extension of the classical plane wave Lorentz-Mie theory with the expansion of the incident field requiring numerical integration of finite surface integrals only. The net force exerted on the particle is then determined using the Maxwell stress tensor approach. Using the optical trapping model one can consider the laser trapping process in the far-field of the focusing objective, also known as the far-field trapping, and the laser trapping achieved by focused evanescent field, i.e. near-field optical trapping. Investigations of far-field laser trapping show that spherical aberration plays a significant role in the trapping process if a refractive index mismatch exists between the objective immersion and particle suspension media. An optical trap efficiency is severely degraded under the presence of spherical aberration. However, our study shows that the spherical aberration effect can be successfully dealt with using our optical trapping model. Theoretical investigations of the trapping process achieved using an obstructed laser beam indicate that the transverse trapping efficiency decreases rapidly with increasing size of the obstruction, unlike the trend predicted using a ray optics model. These theoretical investigations are in a good agreement with our experimentally observed results. Far-field optical trapping with complex doughnut laser beams leads to reduced lifting force for small dielectric particles, compared with plane wave illumination, while for large particles it is relatively unchanged. A slight advantage of using a doughnut laser beam over plane wave illumination for far-field trapping of large dielectric particles manifests in a higher forward axial trapping efficiency, which increases for increasing doughnut beam topological charge. It is indicated that the maximal transverse trapping efficiency decreases for reducing particle size and that the rate of decrease is higher for doughnut beam illumination, compared with plane wave illumination, which has been confirmed by experimental measurements. A near-field trapping modality is investigated by considering a central obstruction placed before the focusing objective so that the obstruction size corresponds to the minimum convergence angle larger than the critical angle. This implies that the portion of the incident wave that is passed through the high numerical aperture objective satisfies the total internal reflection condition at the surface of the coverslip, so that only a focused evanescent field is present in the particle suspension medium. Interaction of this focused near-field with a dielectric micro-particle is described and investigated using our optical trapping model with a central obstruction. Our investigation shows that the maximal backward axial trapping efficiency or the lifting force is comparable to that achieved by the far-field trapping under similar conditions for either plane wave illumination or complex doughnut beam illumination. The dependence of the maximal axial trapping efficiency on the particle size is nearly linear for near-field trapping with focused evanescent wave illumination in the Mie size regime, unlike that achieved using the far-field trapping technique.

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Ganic, Djenan. "Far-field and near-field optical trapping". Australasian Digital Thesis Program, 2005. http://adt.lib.swin.edu.au/public/adt-VSWT20051130.135436.

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Thesis (PhD) - Swinburne University of Technology, Faculty of Engineering and Industrial Sciences, Centre for Micro-Photonics, 2005.
A thesis submitted for the degree of Doctor of Philosophy, Centre for Micro-Photonics, Faculty of Engineering and Industrial Sciences, 2005. Typescript. Includes bibliographical references (p. 164-177). Also available on cd-rom.

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Morrish, Dru, e DruMorrish@gmail com. "Morphology dependent resonance of a microscope and its application in near-field scanning optical microscopy". Swinburne University of Technology. Centre for Micro-Photonics, 2005. http://adt.lib.swin.edu.au./public/adt-VSWT20051124.121838.

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In recent times, near-field optical microscopy has received increasing attention for its ability to obtain high-resolution images beyond the diffraction limit. Near-field optical microscopy is achieved via the positioning and manipulation of a probe on a scale less than the wavelength of the incident light. Despite many variations in the mechanical design of near-field optical microscopes almost all rely on direct mechanical access of a cantilever or a derivative form to probe the sample. This constricts the study to surface examinations in simple sample environments. Distance regulation between the sample surface and the delicate probe requires its own feedback mechanism. Determination of feedback is achieved through monitoring the shift of resonance of one arm of a 'tuning fork', which is caused by the interaction of the probes tip with the Van der Waals force. Van der Waals force emanates from atom-atom interaction at the top of the sample surface. Environmental contamination of the sample surface with additional molecules such as water makes accurate measurement of these forces particularly challenging. The near-field study of living biological material is extremely difficult as an aqueous environment is required for its extended survival. Probe-sample interactions within an aqueous environment that result in strong detectable signal is a challenging problem that receives considerable attention and is a focus of this thesis. In order to increase the detectible signal a localised field enhancement in the probing region is required. The excitation of an optically resonant probe by morphology dependent resonance (MDR) provides a strong localised field enhancement. Efficient MDR excitation requires important coupling conditions be met, of which the localisation of the incident excitation is a critical factor. Evanescent coupling by frustrated total internal reflection to a MDR microcavity provides an ideal method for localised excitation. However it has severe drawbacks if the probe is to be manipulated in a scanning process. Tightly focusing the incident illumination by a high numerical aperture objective lens provides the degree of freedom to enable both MDR excitation and remote manipulation. Two-photon nonlinear excitation is shown to couple efficiently to MDR modes due to the high spatial localisation of the incident excitation in three-dimensions. The dependence of incident excitation localisation by high numerical aperture objective on MDR efficiency is thoroughly examined in this thesis. The excitation of MDR can be enhanced by up to 10 times with the localisation of the incident illumination from the centre of the microcavity to its perimeter. Illuminating through a high numerical aperture objective enables the remote noninvasive manipulation of a microcavity probe by laser trapping. The transfer of photon momentum from the reflection and refraction of the trapping beam is sufficient enough to exert piconewtons of force on a trapped particle. This allows the particle to be held and scanned in a predictable fashion in all three-dimensions. Optical trapping removes the need for invasive mechanical access to the sample surface and provides a means of remote distance regulation between the trapped probe and the sample. The femtosecond pulsed beam utilised in this thesis allows the simultaneous induction of two-photon excitation and laser trapping. It is found in this thesis that a MDR microcavity can be excited and translated in an efficient manner. The application of this technique to laser trapped near-field microscopy and single molecule detection is of particular interest. Monitoring the response of the MDR signal as it is scanned over a sample object enables a near-field image to be built up. As the enhanced evanescent field from the propagation of MDR modes around a microcavity interacts with different parts of the sample, a measurable difference in energy leakage from the cavity modes occurs. The definitive spectral properties of MDR enables a multidimensional approach to imaging and sensing, a focus of this thesis. Examining the spectral modality of the MDR signal can lead to a contrast enhancement in laser trapped imaging. Observing a single MDR mode during the scanning process can increase the image contrast by up to 1:23 times compared to that of the integrated MDR fluorescence spectrum. The work presented in this thesis leads to the possibility of two-photon fluorescence excitation of MDR in combination with laser trapping becoming a valuable tool in near- field imaging, sensing and single molecule detection in vivo. It has been demonstrated that particle scanned, two-photon fluorescence excitation of MDR, by laser trapping 'tweezers' can provide a contrast enhancement and multiple imaging modalities. The spectral imaging modality has particular benefits for image contrast enhancements.

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Renaut, Claude. "Nanopinces optiques sur puce pour la manipulation de particules diélectriques". Thesis, Dijon, 2014. http://www.theses.fr/2014DIJOS010/document.

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Les nanocavités optiques sur puces sont devenues aujourd'hui des objets de base pour le piégeage et la manipulation d'objets colloïdaux. Nous étudions dans cette thèse des nanocavités comme briques de bases du piégeage et de la manipulation par forces optiques. La preuve de concept du piégeage de microsphères diélectriques apparaît comme le point de départ de l'élaboration d'un laboratoire sur puce. Dans le premier chapitre nous parcourons la bibliographie de l'utilisation des forces optiques en espace libre et en milieu confiné pour le piégeage de particules. Le second chapitre présente les dispositifs expérimentaux pour la caractérisation des nanocavités et les outils mis en place pour les mesures optiques en présence de particules colloïdales. Le troisième chapitre explique la preuve de concept du piégeage de particules de polystyrène de 500 nm, 1 et 2 µm. Dans le chapitre qui suit nous analysons le piégeage de particules en fonction de la puissance injectée dans la cavité. Le chapitre cinq décrit quelques exemples des possibilités de fonctions de manipulation de particules grâce à des cavités couplées. Enfin, dans le dernier chapitre nous montrons les assemblages de particules sur les différents types de cavités étudiées dans cette thèse
On chips optical nanocavities have become useful tools for trapping and manipulation of colloidal objects. In this thesis we study the nanocavities as building blocks for optical forces, trapping and handling of particles. Proof of concept of trapping dielectric microspheres appears as the starting point of the development of lab on chip. In the first chapter we go through the literature of optical forces in free space and integrated optics. The second chapter presents the experimental tools for the characterization of nanocavities and the set-up developed to perform optical measurements with the colloidal particles. The third chapter describes the proof-of-concept trapping of polystyrene particles of 500 nm, 1 and 2 µm. In the following chapter we analyze the particle trapping as function of the injected power into the cavities. The chapter five gives some examples of the possibilities of particles handling functions with coupled cavities. Eventually, in the last chapter we show assemblies of particles on different geometry of cavities studied in this thesis

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Yang, Xingyu. "Manipulating the inverse Faraday effect at the nanoscale". Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS219.

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Le magnétisme induit par la lumière décrit l'effet par lequel un matériau est magnétisé par une impulsion optique. Dans les matériaux transparents, la magnétisation induite optiquement peut être réalisée directement par la lumière polarisée circulairement. Parfois, dans les matériaux métalliques, ce type de magnétisation existe également en raison du trajet solénoïdal microscopique des électrons entraînés par la lumière polarisée circulairement. Dans certains cas, la lumière crée des courants de dérive continus circulants macroscopiques, qui induisent également une magnétisation continue dans le métal. De manière générale, ces magnétismes induits par la lumière sont connus sous le nom d'effet Faraday inverse. Dans le projet de doctorat, j'ai étudié les courants de dérive induits par la lumière dans plusieurs nanoantennes en or. Nous avons réalisé des champs magnétiques stationnaires amplifiés plasmoniquement grâce à ces courants de dérive. L'étude est basée sur la méthode des différences finies dans le domaine temporel (FDTD) et les théories correspondantes du magnétisme induit par la lumière. Dans différents sujets de recherche, nous avons réalisé : 1) un champ magnétique stationnaire ultra-rapide, confiné et fort dans une nanoantenne en forme d'œil de taureau. 2) Un champ magnétique stationnaire à travers une polarisation linéaire dans un nanorod. 3) Un skyrmion de type Neel construit par un champ magnétique stationnaire dans un nanoring. Dans ces études, nous avons examiné les propriétés optiques de différentes nanoantennes et expliqué l'origine physique des courants de dérive induits par la lumière et des champs magnétiques stationnaires. Nous avons démontré la méthode pour obtenir des effets Faraday inverses amplifiés plasmoniquement et exploré la possibilité de réaliser une magnétisation par la lumière incidente polarisée linéairement. Enfin, nous avons étendu l'effet Faraday inverse à d'autres domaines de recherche physique, tels que la construction de skyrmions par des champs magnétiques stationnaires à travers l'effet Faraday inverse. L'effet magnétique de la lumière reste un domaine de recherche riche. Mes études pourraient trouver des applications dans de nombreux domaines, y compris les matériaux et dispositifs magnéto-optiques, le stockage de données optiques, les applications biomédicales, la spintronique, l'informatique quantique, la recherche fondamentale en électromagnétisme et la recherche sur les matériaux avancés
Light-induced magnetism describes the effect where a material is magnetized by an optical pulse. In transparent materials, optically-induced magnetization can be realized directly by circularly polarized light. Sometimes, in metallic materials, this type of magnetization also exists due to the microscopic solenoidal path of electrons driven by circularly polarized light. In some cases, the light creates macroscopic circulating DC drift currents, which also induce DC magnetization in metal. In a broad sense, these light-induced magnetisms are known as the inverse Faraday effect.In the PhD project, I studied light-induced drift currents in multiple gold nanoantennas. We realized plasmonically enhanced stationary magnetic fields through these drift currents. The study is based on the Finite-Difference Time-Domain (FDTD) method and the corresponding light-induced magnetism theories. In different research topics, we have realized: 1) an ultrafast, confined, and strong stationary magnetic field in a bull-eye nanoantenna. 2) A stationary magnetic field through linear polarization in a nanorod. 3) A Neel-type skyrmion constructed by a stationary magnetic field in a nanoring. In these studies, we examined the optical properties of different nanoantennas and explained the physical origin of light-induced drift currents and stationary magnetic fields. We demonstrated the method to achieve plasmonically enhanced inverse Faraday effects and explored the possibility of realizing magnetization through linearly polarized incident light. Finally, we extended the inverse Faraday effect to more physical research areas, such as constructing skyrmions by stationary magnetic fields through the inverse Faraday effect.The magnetic effect of light remains a rich area of research. My studies might find applications in many areas, including magneto-optical materials and devices, optical data storage, biomedical applications, spintronics, quantum computing, fundamental research in electromagnetism, and advanced materials research

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Fulton, Ray. "Atomic and molecular manipulation in pulsed optical fields". Thesis, Heriot-Watt University, 2006. http://hdl.handle.net/10399/125.

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Pritchard, Matthew J. "Manipulation of ultracold atoms using magnetic and optical fields". Thesis, Durham University, 2006. http://etheses.dur.ac.uk/2373/.

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The loading and guiding of a launched cloud of cold atoms with the optical dipole force are theoretically and numerically modelled. A far-off resonance trap can be realised using a high power Gaussian mode laser, red-detuned with respect to the principal atomic resonance (Rb 5s-5p). The optimum strategy for loading typically 30% of the atoms from a Magneto optical trap and guiding them vertically through 22 cm is discussed. During the transport the radial size of the cloud is confined to a few hundred microns, whereas the unconfined axial size grows to be approximately 1 cm. It is proposed that the cloud can be focused in three dimensions at the apex of the motion by using a single magnetic impulse to achieve axial focusing. A theoretical study of six current-carrying coil and bar arrangements that generate magnetic lenses is made. An investigation of focusing aberrations show that, for typical experimental parameters, the widely used assumption of a purely harmonic lens is often inaccurate. A new focusing regime is discussed: isotropic 3D focusing of atoms with a single magnetic lens. The baseball lens offers the best possibility for isotropically focusing a cloud of weak-field-seeking atoms in 3D.A pair of magnetic lens pulses can also be used to create a 3D focus (the alternate-gradient method). The two possible pulse sequences are discussed and it is found that they are ideal for loading both 'pancake' and 'sausage’ shaped magnetic/optical microtraps. It is shown that focusing aberrations are considerably smaller for double-impulse magnetic lenses compared to single- impulse magnetic lenses. The thesis concludes by describing the steps taken towards creating a 3D quasi- electrostatic lattice for 85Ilb， using a CՕշ laser. The resulting lattice of trapped atoms will have a low decoherence, and with resolvable lattice sites, it therefore provides a useful system to implement quantum information processing.

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Lowney, Joseph Daniel. "Manipulating and Probing Angular Momentum and Quantized Circulation in Optical Fields and Matter Waves". Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/612898.

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Methods to generate, manipulate, and measure optical and atomic fields with global or local angular momentum have a wide range of applications in both fundamental physics research and technology development. In optics, the engineering of angular momentum states of light can aid studies of orbital angular momentum (OAM) exchange between light and matter. The engineering of optical angular momentum states can also be used to increase the bandwidth of optical communications or serve as a means to distribute quantum keys, for example. Similar capabilities in Bose-Einstein condensates are being investigated to improve our understanding of superfluid dynamics, superconductivity, and turbulence, the last of which is widely considered to be one of most ubiquitous yet poorly understood subjects in physics. The first part of this two-part dissertation presents an analysis of techniques for measuring and manipulating quantized vortices in BECs. The second part of this dissertation presents theoretical and numerical analyses of new methods to engineer the OAM spectra of optical beams. The superfluid dynamics of a BEC are often well described by a nonlinear Schrodinger equation. The nonlinearity arises from interatomic scattering and enables BECs to support quantized vortices, which have quantized circulation and are fundamental structural elements of quantum turbulence. With the experimental tools to dynamically manipulate and measure quantized vortices, BECs are proving to be a useful medium for testing the theoretical predictions of quantum turbulence. In this dissertation we analyze a method for making minimally destructive in situ observations of quantized vortices in a BEC. Secondly, we numerically study a mechanism to imprint vortex dipoles in a BEC. With these advancements, more robust experiments of vortex dynamics and quantum turbulence will be within reach. A more complete understanding of quantum turbulence will enable principles of microscopic fluid flow to be related to the statistical properties of turbulence in a superfluid. In the second part of this dissertation we explore frequency mixing, a subset of nonlinear optical processes in which one or more input optical beam(s) are converted into one or more output beams with different optical frequencies. The ability of parametric nonlinear processes such as second harmonic generation or parametric amplification to manipulate the OAM spectra of optical beams is an active area of research. In a theoretical and numerical investigation, two complimentary methods for sculpting the OAM spectra are developed. The first method employs second harmonic generation with two non-collinear input beams to develop a broad spectrum of OAM states in an optical field. The second method utilizes parametric amplification with collinear input beams to develop an OAM-dependent gain or attenuation, termed dichroism for OAM, to effectively narrow the OAM spectrum of an optical beam. The theoretical principles developed in this dissertation enhance our understanding of how nonlinear processes can be used to engineer the OAM spectra of optical beams and could serve as methods to increase the bandwidth of an optical signal by multiplexing over a range of OAM states.

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Sergides, M. "Optical manipulation of micro- and nano-particles using evanescent fields". Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1410938/.

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We present a study of the manipulation of micro-particles and the formation of optically bound structures of particles in evanescent wave traps. Two trapping geometries are considered: the first is a surface trap where the evanescent field above a glass prism is formed by the interference of a number of laser beams incident on the prism-water interface; the second uses the evanescent field surrounding a bi-conical tapered optical fibre that has been stretched to produce a waist of sub-micron diameter. In the surface trap we have observed the formation of optically bound one- and two-dimensional structures of particles and measured the binding spring constant by tracking particle motion and the extent of the particle’s Brownian fluctuations. Additionally, we have measured the inter-particle separations in the one-dimensional chain structures and characterised the geometry of the two-dimensional arrays. In the tapered optical fibre trap we demonstrated both particle transport for long distances along the fibre, and the formation of stable arrays of particles. We present the fabrication of tapered optical fibres using the 'heat-and-pull` technique, and evanescent wave optical binding of micro-particles to the taper. Calculations of the distribution of the evanescent field surrounding a tapered fibre are also presented. We show that the combination of modes can give control over the locations of the trapping sites. Additionally, we show how the plasmon resonance of metallic nano-particles can be exploited to enhance the optical trapping force, and suggest how a bi-chromatic nano-fibre trap for plasmonic particles may be implemented. In both experiments we implement video microscopy to track the particle locations and make quantitative measures of the particle dynamics. The experimental studies are complemented by light scattering calculations based on Mie theory to infer how the geometries of the particle structures are controlled by the underlying incident and scattered optical fields.

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Braun, Marco. "Optically Controlled Manipulation of Single Nano-Objects by Thermal Fields". Doctoral thesis, Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-206342.

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This dissertation presents and explores a technique to confine and manipulate single and multiple nano-objects in solution by exploiting the thermophoretic interactions with local temperature gradients. The method named thermophoretic trap uses an all-optically controlled heating via plasmonic absorption by a gold nano-structure designed for this purpose. The dissipation of absorbed laser light to thermal energy generates a localized temperature field. The spatial localization of the heat source thereby leads to strong temperature gradients that are used to drive a particle or molecule into a desired direction. The behavior of nano-objects confined by thermal inhomogeneities is explored experimentally as well as theoretically. The monograph treats three major experimental stages of development, which essentially differ in the way the heating laser beam is shaped and controlled. In a first generation, a static heating of an appropriate gold structure is used to induce a steady temperature profile that exhibits a local minimum in which particles can be confined. This simple realization illustrates the working principle best. In a second step, the static heating is replaced. A focused laser beam is used to heat a smaller spatial region. In order to confine a particle, the beam is steered in circles along a circular gold structure. The trapping dynamics are studied in detail and reveal similarities to the well-established Paul trap. The largest part of the thesis is dedicated to the third generation of the trap. While the hardware is identical to the second generation, using the real-time information on the position of the trapped object to heat only particular sites of the gold structure strongly increases the efficiency of the trap compared to the earlier versions. Beyond that, the optical feedback control allows for an active shaping of the effective virtual trapping potential by applying modified feedback rules, including e.g. a double-well or a box-like potential. This transforms the formerly pure trapping device to a versatile technique for micro and nano-fluidic manipulation. The physical and technical contributions to the limits of the method are explored. Finally, the feasibility of trapping single macro-molecules is demonstrated by the confinement of lambda-DNA for extended time periods over which the molecules center-of-mass motion as well as its conformational dynamics can be studied.

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Libri sul tema "Optical field manipulation"

Ohtsu, Motoichi. Progress in Nano-Electro-Optics VI: Nano-Optical Probing, Manipulation, Analysis, and Their Theoretical Bases. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2008.

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service), SpringerLink (Online, a cura di. Structured Light Fields: Applications in Optical Trapping, Manipulation, and Organisation. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012.

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Li, Lin. Manipulation of Near Field Propagation and Far Field Radiation of Surface Plasmon Polariton. Springer, 2018.

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Li, Lin. Manipulation of Near Field Propagation and Far Field Radiation of Surface Plasmon Polariton. Springer, 2017.

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Structured Light Fields Applications In Optical Trapping Manipulation And Organisation. Springer, 2012.

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Wördemann, Mike. Structured Light Fields: Applications in Optical Trapping, Manipulation, and Organisation. Springer Berlin / Heidelberg, 2014.

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Wördemann, Mike. Structured Light Fields: Applications in Optical Trapping, Manipulation, and Organisation. Springer, 2012.

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Computational Strong-Field Quantum Dynamics: Intense Light-Matter Interactions. de Gruyter GmbH, Walter, 2017.

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Brabec, Thomas, Dieter Bauer, Heiko Bauke, Thomas Fennel e Chris R. McDonald. Computational Strong-Field Quantum Dynamics: Intense Light-Matter Interactions. de Gruyter GmbH, Walter, 2017.

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Brabec, Thomas, Dieter Bauer, Heiko Bauke, Thomas Fennel e Chris R. McDonald. Computational Strong-Field Quantum Dynamics: Intense Light-Matter Interactions. de Gruyter GmbH, Walter, 2017.

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Capitoli di libri sul tema "Optical field manipulation"

Ohtsu, Motoichi. "Near-Field Optical Atom Manipulation: Toward Atom Photonics". In Near-field Nano/Atom Optics and Technology, 217–66. Tokyo: Springer Japan, 1998. http://dx.doi.org/10.1007/978-4-431-67937-0_11.

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Hori, Hirokazu. "Quantum Optical Picture of Photon STM and Proposal of Single Atom Manipulation". In Near Field Optics, 105–14. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1978-8_13.

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Antignus, Yehezkel. "Optical Manipulation for Control of Bemisia tabaci and Its Vectored Viruses in the Greenhouse and Open Field". In Bemisia: Bionomics and Management of a Global Pest, 349–56. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2460-2_13.

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Ohtsu, Motoichi, e Hirokazu Hori. "Fabrication and Manipulation". In Near-Field Nano-Optics, 209–33. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4835-5_7.

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Ohtsu, M., S. Jiang, T. Pangaribuan e M. Kozuma. "Nanometer Resolution Photon STM and Single Atom Manipulation". In Near Field Optics, 131–39. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1978-8_16.

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Vogel, K., W. P. Schleich e G. Kurizki. "Manipulation of Cavity Field States with Multi-Level Atoms". In Coherence and Quantum Optics VII, 589–90. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4757-9742-8_166.

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Gill, Jonathan V., Gilad M. Lerman, Edmund Chong, Dmitry Rinberg e Shy Shoham. "Illuminating Neural Computation Using Precision Optogenetics-Controlled Synthetic Perception". In Neuromethods, 363–92. New York, NY: Springer US, 2023. http://dx.doi.org/10.1007/978-1-0716-2764-8_12.

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AbstractConnecting neuronal activity to perception requires tools that can probe neural codes at cellular and circuit levels, paired with sensitive behavioral measures. In this chapter, we present an overview of current methods for connecting neural codes to perception using precision optogenetics and psychophysical measurements of synthetically induced percepts. We also highlight new methodologies for validating precise control of optical and behavioral manipulations. Finally, we provide a perspective on upcoming developments that are poised to advance the field.

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Covey, Jacob P. "New Physics with the New Apparatus: High Resolution Optical Detection and Large, Stable Electric Fields". In Enhanced Optical and Electric Manipulation of a Quantum Gas of KRb Molecules, 219–30. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-98107-9_10.

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Tang, Lei, e Keyu Xia. "Optical Chirality and Single-Photon Isolation". In Single Photon Manipulation. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.90354.

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Optical isolation is important for protecting a laser from damage due to the detrimental back reflection of light. It typically relies on breaking Lorentz reciprocity and normally is achieved via the Faraday magneto-optical effect, requiring a strong external magnetic field. Single-photon isolation, the quantum counterpart of optical isolation, is the key functional component in quantum information processing, but its realization is challenging. In this chapter, we present all-optical schemes for isolating the backscattering from single photons. In the first scheme, we show the single-photon isolation can be realized by using a chiral quantum optical system, in which a quantum emitter asymmetrically couples to nanowaveguide modes or whispering-gallery modes with high optical chirality. Secondly, we propose a chiral optical Kerr nonlinearity to bypass the so-called dynamical reciprocity in nonlinear optics and then achieve room-temperature photon isolation with low insertion loss. The concepts we present may pave the way for quantum information processing in an unconventional way.

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Roychoudhuri, ChandraSekhar. "Do We Manipulate Photons or Diffractive EM Waves to Generate Structured Light?" In Single Photon Manipulation. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.88849.

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In the domain of light emissions, quantum mechanics has been an immensely successful guiding tool for us. In the propagation of light and optical instrument design, Huygens-Fresnel diffraction integral (HFDI) (or its advanced versions) and Maxwell’s wave equation are continuing to be the essential guiding tools for optical scientists and engineers. In fact, most branches of optical science and engineering, like optical instrument design, image processing, Fourier optics, Holography, etc., cannot exist without using the foundational postulates behind the Huygens-Fresnel diffraction integral. Further, the field of structured light is also growing where phases and the state of polarizations are manipulated usually with suitable classical macro-devices to create wave fronts that restructured through light-matter interactions through these devices. Mathematical modeling of generating such complex wave fronts generally follows classical concepts and classical macro tools of physical optics. Some of these complex light beams can impart mechanical angular momentum and spin-like properties to material particles inserted inside these structured beams because of their electromagnetic dipolar properties and/or structural anisotropy. Does that mean these newly structured beams have acquired new quantum properties without being generated through quantum devices and quantum transitions? In this chapter, we bridge the classical and quantum formalism by defining a hybrid photon (HP). HP is a quantum of energy, hν, at the initial moment of emission. It then immediately evolves into a classical time-finite wave packet, still transporting the original energy, hν, with a classical carrier frequency ν (oscillation of the E-vector). This chapter will raise enquiring questions whether all these observed “quantum-like” behaviors are manifestations of the joint properties of interacting material particles with classical EM waves or are causal implications of the existence of propagation of “indivisible light quanta” with exotic properties like spin, angular momentum, etc.

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Atti di convegni sul tema "Optical field manipulation"

Zhao, Chenglong, Geonsoo Jin e Tony Jun Huang. "Acoustofluidic Scanning Nanoscope for Large Field-of-view Imaging". In Optical Manipulation and Its Applications. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/oma.2023.atu1d.4.

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Optical imaging with nanoscale resolution and a large field of view are highly desirable optical imaging. This talk introduces an acoustofluidic scanning nanoscope that can achieve both super-resolution and large field-of-view imaging.

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Sadgrove, M., A. Suda, R. Matsuyama, M. Komiya, T. Yoshino, D. Yamaura, M. Sugawara et al. "Liposome manipulation using the evanescent field of an optical nanofiber". In Optical Manipulation and Its Applications. Washington, D.C.: OSA, 2021. http://dx.doi.org/10.1364/oma.2021.aw4d.4.

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Reece, Peter J., Veneranda Garcés-Chávez e Kishan Dholakia. "Near-field optical manipulation with cavity enhanced evanescent fields". In Integrated Optoelectronic Devices 2006, a cura di David L. Andrews. SPIE, 2006. http://dx.doi.org/10.1117/12.660814.

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Rui, Guanghao, Bing Gu e Yiping Cui. "Manipulation of nanoparticles with tailored optical focal field". In Optical Manipulation and Structured Materials Conference, a cura di Takashige Omatsu. SPIE, 2018. http://dx.doi.org/10.1117/12.2319002.

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Mansuripur, Masud. "Self-field, radiated energy, and radiated linear momentum of an accelerated point charge". In Optical Manipulation and Its Applications. Washington, D.C.: OSA, 2019. http://dx.doi.org/10.1364/oma.2019.am3e.1.

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Deng, Zi-Lan. "Vectorial metagrating for multidimensional optical field manipulation". In Plasmonics VI, a cura di Zheyu Fang e Takuo Tanaka. SPIE, 2021. http://dx.doi.org/10.1117/12.2602471.

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Yamanishi, Junsuke, Hyo-yong Ahn e Hiromi Okamoto. "Nanoscopic visualization of chiro-optical field in photoinduced force microscopy". In Optical Manipulation and Structured Materials Conference, a cura di Takashige Omatsu, Síle N. Chormaic e Kishan Dholakia. SPIE, 2023. http://dx.doi.org/10.1117/12.3008343.

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Schmieder, Felix, Rouhollah Habibey, Volker Busskamp, Lars Büttner e Jürgen W. Czarske. "Correlation analysis of human iPSC-derived neuronal networks using holographic single cell and full field stimulation". In Optogenetics and Optical Manipulation 2021, a cura di Samarendra K. Mohanty, Anna W. Roe e Shy Shoham. SPIE, 2021. http://dx.doi.org/10.1117/12.2583240.

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Ito, Haruhiko, K. Otake e Motoichi Ohtsu. "Near-field optical guidance and manipulation of atoms". In SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, a cura di Suganda Jutamulia e Toshimitsu Asakura. SPIE, 1998. http://dx.doi.org/10.1117/12.326826.

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Awfi, Khalid Al, Vassilis E. Lembessis e Omar M. Aldosssary. "On optical tweezers forces exerted by tightly focused optical vortices". In Optical Manipulation and Its Applications. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/oma.2023.atu3d.2.

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An ab initio calculation of the optical tweezers force components in the Rayleigh regime is presented in the case of a tightly focused optical vortex, taking into account the previously ignored axial electric field component.

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Rapporti di organizzazioni sul tema "Optical field manipulation"

Bukosky, S. Manipulation of Colloidal Aggregation Behavior and Optical PropertiesUsing Applied Electric Fields. Office of Scientific and Technical Information (OSTI), ottobre 2018. http://dx.doi.org/10.2172/1524724.

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