Bibliographies thématiques / Light helicity

Littérature scientifique sur le sujet « Light helicity »

Auteur : Grafiati
Publié le 8 juin 2024

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Articles de revues sur le sujet "Light helicity"

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Kovalev, Alexey A., Victor V. Kotlyar et Alexey M. Telegin. « Optical Helicity of Light in the Tight Focus ». Photonics 10, no 7 (23 juin 2023) : 719. http://dx.doi.org/10.3390/photonics10070719.

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Using the Richards–Wolf formalism, we obtain explicit analytical expressions for the optical helicity density at the tight focus of four different light beams: a linearly polarized optical vortex, an optical vortex with right-handed circular polarization, superposition of a cylindrical vector beam and a linearly polarized beam, and a beam with hybrid circular-azimuthal polarization. We show that, in all four cases, the helicity density at the focus is nonzero and has different signs in different focal plane areas. If the helicity density changes sign, then the full helicity of the beam (averaged over the beam cross section at the focus) is zero and is conserved upon propagation. We reveal that the full helicity is zero when the full longitudinal component of the spin angular momentum is zero. If the helicity density does not change sign at the focus, such as in a circularly polarized optical vortex, then it is equal to the intensity in the focus, with the full helicity being equal to the beam power and conserving upon propagation. Although the helicity is related to the polarization state distribution across the beam at the focus, the expressions for the helicity density are found to be different from those for the longitudinal component of the spin angular momentum for the beams of interest.
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Bengtsson, A. K. H. « Light-front higher-helicity interactions ». Fortschritte der Physik 60, no 9-10 (29 février 2012) : 1038–43. http://dx.doi.org/10.1002/prop.201200035.

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Poulikakos, Lisa V., Jennifer A. Dionne et Aitzol García-Etxarri. « Optical Helicity and Optical Chirality in Free Space and in the Presence of Matter ». Symmetry 11, no 9 (3 septembre 2019) : 1113. http://dx.doi.org/10.3390/sym11091113.

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The inherently weak nature of chiral light–matter interactions can be enhanced by orders of magnitude utilizing artificially-engineered nanophotonic structures. These structures enable high spatial concentration of electromagnetic fields with controlled helicity and chirality. However, the effective design and optimization of nanostructures requires defining physical observables which quantify the degree of electromagnetic helicity and chirality. In this perspective, we discuss optical helicity, optical chirality, and their related conservation laws, describing situations in which each provides the most meaningful physical information in free space and in the context of chiral light–matter interactions. First, an instructive comparison is drawn to the concepts of momentum, force, and energy in classical mechanics. In free space, optical helicity closely parallels momentum, whereas optical chirality parallels force. In the presence of macroscopic matter, the optical helicity finds its optimal physical application in the case of lossless, dual-symmetric media, while, in contrast, the optical chirality provides physically observable information in the presence of lossy, dispersive media. Finally, based on numerical simulations of a gold and silicon nanosphere, we discuss how metallic and dielectric nanostructures can generate chiral electromagnetic fields upon interaction with chiral light, offering guidelines for the rational design of nanostructure-enhanced electromagnetic chirality.
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Crimin, Frances, Neel Mackinnon, Jörg Götte et Stephen Barnett. « Optical Helicity and Chirality : Conservation and Sources ». Applied Sciences 9, no 5 (26 février 2019) : 828. http://dx.doi.org/10.3390/app9050828.

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We consider the helicity and chirality of the free electromagnetic field, and advocate the former as a means of characterising the interaction of chiral light with matter. This is in view of the intuitive quantum form of the helicity density operator, and of the dual symmetry transformation generated by its conservation. We go on to review the form of the helicity density and its associated continuity equation in free space, in the presence of local currents and charges, and upon interaction with bulk media, leading to characterisation of both microscopic and macroscopic sources of helicity.
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Guadagnini, E. « Gravitational deflection of light and helicity asymmetry ». Physics Letters B 548, no 1-2 (novembre 2002) : 19–23. http://dx.doi.org/10.1016/s0370-2693(02)02811-3.

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Hernández, Raúl Josué, Francisco J. Sevilla, Alfredo Mazzulla, Pasquale Pagliusi, Nicola Pellizzi et Gabriella Cipparrone. « Collective motion of chiral Brownian particles controlled by a circularly-polarized laser beam ». Soft Matter 16, no 33 (2020) : 7704–14. http://dx.doi.org/10.1039/c9sm02404b.

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Remote switching from passive to collective chiral-active motion by circularly-polarized light is shown for spherical polymeric Brownian particles. Light-propulsion is triggered by the coupling between the particle's chirality and the light helicity.
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Krassnigg, A., et H. C. Pauli. « On helicity and spin on the light cone ». Nuclear Physics B - Proceedings Supplements 108 (avril 2002) : 251–55. http://dx.doi.org/10.1016/s0920-5632(02)01338-5.

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Yu Yang, 于洋, 范之国 Fan Zhiguo, 徐少罕 u Shaohan et 高隽 Gao Jun. « Study on Helicity Flip of Backscattered Circular Polarized Light ». Chinese Journal of Lasers 42, no 11 (2015) : 1113004. http://dx.doi.org/10.3788/cjl201542.1113004.

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Dainone, Pambiang Abel, Nicholas Figueiredo Prestes, Pierre Renucci, Alexandre Bouché, Martina Morassi, Xavier Devaux, Markus Lindemann et al. « Controlling the helicity of light by electrical magnetization switching ». Nature 627, no 8005 (27 mars 2024) : 783–88. http://dx.doi.org/10.1038/s41586-024-07125-5.

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Kiemle, Jonas, Philipp Zimmermann, Alexander W. Holleitner et Christoph Kastl. « Light-field and spin-orbit-driven currents in van der Waals materials ». Nanophotonics 9, no 9 (29 juin 2020) : 2693–708. http://dx.doi.org/10.1515/nanoph-2020-0226.

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AbstractThis review aims to provide an overview over recent developments of light-driven currents with a focus on their application to layered van der Waals materials. In topological and spin-orbit dominated van der Waals materials helicity-driven and light-field-driven currents are relevant for nanophotonic applications from ultrafast detectors to on-chip current generators. The photon helicity allows addressing chiral and non-trivial surface states in topological systems, but also the valley degree of freedom in two-dimensional van der Waals materials. The underlying spin-orbit interactions break the spatiotemporal electrodynamic symmetries, such that directed currents can emerge after an ultrafast laser excitation. Equally, the light-field of few-cycle optical pulses can coherently drive the transport of charge carriers with sub-cycle precision by generating strong and directed electric fields on the atomic scale. Ultrafast light-driven currents may open up novel perspectives at the interface between photonics and ultrafast electronics.
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Thèses sur le sujet "Light helicity"

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Mitra, Deboleena. « Light Mediated Drug Delivery Using Photocaged Molecules and Photoswitchable Peptides ». VCU Scholars Compass, 2014. http://scholarscompass.vcu.edu/etd/3618.

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There are many different types of targeted therapy for cancer treatment. The method of light mediated targeted therapy that we have developed uses photocaged molecules and photoswitchable peptides. In photocaging, a biologically active molecule is made inactive by the attachment of a photocleavable blocking group. On exposure to UV radiation the photocleavable entity is removed and the biologically active molecule is released. Using this concept we have designed a prodrug that consists of a cell impermeable hydrophilic molecule attached to a photocaged doxorubicin. Upon irradiation with UV light the photosensitive group is removed and cytotoxic doxorubicin is released at the tumor site. This concept has been further modified by attaching receptor binding molecules to the photocaged entity to increase its specificity. A peptide which consists of an azobenzene photoswitch has been used which, in the dark state is randomly coiled and cell impermeable but upon illumination becomes helical and cell permeable and can be used to deliver drugs into the cells. Upon illumination with UV light of suitable wavelength the azobenzene linker will change from a trans to a cis form and this will convert the randomly coiled cell impermeable peptide into an α helical permeable form. Thus a series of peptides have been designed with different arginine mutations which develop an arginine patch in the helical form. This arginine patch would help in cell permeability by interacting with cell surface glycans. The method could potentially be used to deliver drugs into cells in presence of light.
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Huang, Tianxun. « A study about the behavior and mechanism of all-optical switching ». Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0054.

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Afin de répondre aux besoins des futures technologies de stockage magnétique à haute densité, à faible consommation d’énergie et à haut débit, le développement d’une nouvelle méthode de manipulation de l’aimantation avec des temps d’inversion d’aimantation plus courts et une consommation d’énergie plus faible est l’une des tâches urgentes dans le domaine de la spintronique. La technologie laser à impulsions ultracourtes offre une nouvelle façon de manipuler le spin sur une échelle de temps femtoseconde, suscitant un grand intérêt de recherche dans les universités et l’industrie. Deux méthodes de contrôle de l’aimantation par laser, l’interrupteur à corrélation d’hélicoïdalité totale (AO-HDS) et l’interrupteur à corrélation d’hélicoïdalité totale (AO-HIS), ont récemment été découvertes et leurs mécanismes, comportements et applications ont fait l’objet de nombreuses discussions. Cependant, l’origine de ces deux phénomènes reste très controversée et ce sera la tâche principale de cet article. Le mécanisme de l’AO-HDS a été étudié à l’aide d’un empilement multicouche Co/Pt présentant le phénomène AO-HDS. La membrane a été réalisée sur un barreau de Hall en un carré magnétique de 10x10 um^2 et son comportement de commutation a été observé à différentes échelles de temps. La commutation de cette cellule magnétique peut être démontrée par dix impulsions laser successives polarisées circulairement. La dynamique de spin de AO-HDS peut être comprise par thermonucléation de domaine magnétique induite par Gradient thermique et propagation de paroi de domaine. Au cours des dernières années, l’AO-HIS n’a jamais été observé dans d’autres alliages de métaux de transition de terres rares, à l’exception du fait que la terre rare est Gd. Pour étudier les caractéristiques de GD, on a cultivé et étudié une série d’alliages GdRCo (R pour Tb, Dy ou Ho), l’AO-HIS peut être observé lorsque la composition de R est aussi faible que 1,5% au voisinage du point de compensation du ferromagnétique. Les diagrammes d’état décrivant les paramètres clés qui dépendent de la concentration de l’élément et de la dynamique de spin dans divers échantillons ont été étudiés, ce qui donne quelques suggestions sur l’origine de l’AO-HIS et ses applications futures en ingénierie
To meet the future needs of high density, low power consumption, and fast rate of magnetic storage technology, it is one of the urgent tasks in the field of spintronics to develop a new method of magnetization manipulation with shorter magnetization reversal time and lower energy consumption. Ultrashort pulsed laser technology offers a new way to manipulate spins in femtosecond timescale, sparking great research interest in both academia and industry. Two methods of controlling magnetization by laser, all-optical helicity-dependent switching (AO-HDS) and all-optical helicity-independent switching (AO-HIS), are discovered recently and raise numerous discussion on their mechanisms, behaviors and applications. However, the origin of two phenomena is still largely debated, which will be the main task of this thesis. A Co/Pt multilayered stack exhibiting AO-HDS phenomenon is employed to study the mechanism of AO-HDS. The film is fabricated to a 10x10 um^2 magnetic square on a Hall bar and its switching behavior is observed optically and electrically at different timescale. The switching of this magnetic unit can be demonstrated with ten consecutive circularly polarized laser pulses. The spin dynamics of AO-HDS can be understood in terms of the magnetic domain thermal nucleation and domain wall propagation driven bythermal gradient. For the past years, AO-HIS has never been observed in other rare-earth transition-metal alloys except when the rare-earth is Gd. To study the speciality of Gd, a complete series of GdRCo (R represents Tb, Dy or Ho) alloys is grown and investigated, it is demonstrated that AO-HIS can be observed when the composition of R is as low as 1.5% near the compensation point of ferrimagnet. State diagrams describing the key parameters depending on the element concentrations and spin dynamics in various samples are studied, providing some suggestion on the origin of AO-HIS and its engineering application in the future
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van, Kruining Koen. « Spin and helicity in structured waves for light and electrons ». 2018. https://tud.qucosa.de/id/qucosa%3A34252.

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This dissertation consists of two parts, connected by the overarching theme of the dynamics of structured waves with internal degrees of freedom. Part I concerns light, whose internal degree of freedom is polarisation. We investigate the helicity, or handedness of light, which is a good quantum number for massless fields in general and light in particular. In free space it is always possible to describe the light field in a basis left- and right handed helicity modes which are solutions of Maxwell's equations, regardless what spatial structure is chosen. This is useful for bases of highly inhomogeneous waves, such as Bessel waves, for which the spin cannot be unambiguously defined. In chapter 1 we study the conservation of helicity and the preservation of its underlying symmetry, electric-magnetic duality symmetry when light travels through inhomogeneous and/or anisotropic media. We will discuss some of the unique properties of duality symmetric media and reformulate Maxwell's equations in such a way that the decoupling of different helicities for duality symmetric media becomes apparent. The feasibility of constructing duality symmetric media is discussed at the end of the chapter. In chapter 2 we consider superpositions of plane electromagnetic waves in free space. Such superpositions typically interfere. We present superpositions of up to six plane waves which defy this expectation by having a perfectly homogeneous mean square of the electric field. Because most matter interacts much stronger with the electric than with the magnetic field, these superpositions can be considered noninterfering. Our superpositions show complex patterns in their helicity densities, of which we will show many examples. We study the effects on our helicity patterns of imperfections that may occur in a realistic experiment: deviations from the optimal amplitudes, phases and polarisations of the superposed waves, small misalignments and partially coherent light. Our superpositions can be used to write chiral patterns in light sensitive liquid crystals. Conversely, these liquid crystals can be used for an `optical helicity camera' which records spatial variations in helicity. In the final paragraph of chapter 2 we discuss some mathematical questions concerning noninterfering superpositions. Part II concerns electrons, whose internal degree of freedom is spin. In chapter 3 we will present analytical solutions of the Dirac equation for an electron vortex beam in a homogeneous magnetic field. Including spin from the beginning reveals that spin polarised electron vortex beams have a complicated azimuthal current structure, containing small rings of counterrotating current between rings of stronger corotating current. Contrary to many other problems in relativistic quantum mechanics, there exist vortex beam solutions with exactly zero spin-orbit mixing in the highly relativistic and nonparaxial regime. Chapter 4 treats the interaction between electron vortex states in a homogeneous magnetic field and light, where we expand and quantise the radiation field in a basis of Bessel modes with definite helicity. Our results apply for magnetic field strength beyond the critical field strength at which the spin contributes as much to the electron's energy as its rest mass. We are able to compute spin flip rates for low lying states, finding a much higher degree of equilibrium spin polarisation than approximations for high lying electron states suggested.
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Chapitres de livres sur le sujet "Light helicity"

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Eginligil, Mustafa, et Ting Yu. « Light Helicity Dependent Photocurrent in Graphene Planes ». Dans Second-Order Photogalvanic Photocurrents in 2D Materials, 43–68. Singapore : Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-0618-1_3.

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Kirchbach, M., et D. O. Riska. « The Helicity Shell as a Manifold of Mapped Chiral Vectors ». Dans Mesons and Light Nuclei, 126–32. Vienna : Springer Vienna, 1992. http://dx.doi.org/10.1007/978-3-7091-7617-7_16.

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Eginligil, Mustafa, et Ting Yu. « Light Helicity Dependent Photocurrent in Layered Transition Metal Dichalcogenides ». Dans Second-Order Photogalvanic Photocurrents in 2D Materials, 89–116. Singapore : Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-0618-1_5.

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Tsukamoto, A., S. Kogure, H. Yoshikawa, T. Sato et A. Itoh. « Contribution of magnetic circular dichroism in all-optical light helicity-dependent magnetic switching ». Dans Springer Proceedings in Physics, 334–36. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07743-7_103.

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Machavariani, Alexander. « Perspective Chapter : EPR Paradox – Experimental and Quantum Field Theoretical Status of Light Meson Resonances ». Dans Quantum Entanglement in High Energy Physics [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.1003796.

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The inclusive reaction of the V-meson resonance production is studied in order to check consistency of the field-theoretical approach with formulation based on the Einstein-Podolsky-Rosen (EPR) concepts. For this aim we have constructed the relativistic field-theoretical amplitudes of the V-meson resonance decay 1+2←V with structureless (pointlike) and composite (non-pointlike) resonance. Nonlocal composite states of a resonance are obtained using quark-gluon degrees of freedom in accordance with quantum chromodinamics (QCD). Particle 1 and 2 have opposite momentums p1=−p2 and strongly correlated spin states in the rest frame of V-meson decay. Moreover, for electron-positron decay of the V-meson resonance, electron and positron have the opposite helicity if the electron mass is neglected. Therefore, the decay of V-meson into two particles can be considered as the formation of the EPR-pair according to EPR gedanken experiment. In addition, the color quark-gluon states can be interpreted as hidden (non-observed) states within EPR formulation. As an example of such an approaches, we have considered papers with high-energy experimental data where for description of observable was used quark-antiquark states and concepts of EPR pairs and entanglement.
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Actes de conférences sur le sujet "Light helicity"

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Chirilli, Giovanni Antonio. « Sub-eikonal corrections and low-$x$ helicity evolution ». Dans Light Cone 2019 - QCD on the light cone : from hadrons to heavy ions. Trieste, Italy : Sissa Medialab, 2020. http://dx.doi.org/10.22323/1.374.0034.

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Kuzmin, Vladimir, et Igor Meglinski. « Helicity flip of the backscattered circular polarized light ». Dans BiOS, sous la direction de Adam P. Wax et Vadim Backman. SPIE, 2010. http://dx.doi.org/10.1117/12.841193.

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Forbes, Kayn A., et Garth A. Jones. « Optical helicity, chirality, and spin of 3D-structured Laguerre-Gaussian optical vortices ». Dans Complex Light and Optical Forces XVI, sous la direction de David L. Andrews, Enrique J. Galvez et Halina Rubinsztein-Dunlop. SPIE, 2022. http://dx.doi.org/10.1117/12.2605929.

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Fernandez-Corbaton, Ivan. « Helicity and Duality Symmetry in Light Matter Interactions : Theory and Applications ». Dans Laser Science. Washington, D.C. : OSA, 2015. http://dx.doi.org/10.1364/ls.2015.lm1h.2.

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Shirasawa, K. « Fast helicity switching of circularly polarized light using twin helical undulators ». Dans SYNCHROTRON RADIATION INSTRUMENTATION : Eighth International Conference on Synchrotron Radiation Instrumentation. AIP, 2004. http://dx.doi.org/10.1063/1.1757766.

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van Albada, Meint P., Deiderik S. Wiersma et Ad Lagendijk. « Experimental Evidence for Loop-Type Photon Trajectories in Random Media with Strong Disorder ». Dans Advances in Optical Imaging and Photon Migration. Washington, D.C. : Optica Publishing Group, 2022. http://dx.doi.org/10.1364/aoipm.1994.wpl.25.

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Dubrovkin, Alexander M., Giorgio Adamo, Lan Wang, Qi Jie Wang, Nikolay I. Zheludev et Cesare Soci. « Structural and spin-momentum locking chiralities in topological insulators by photocurrent nanoimaging ». Dans CLEO : Fundamental Science. Washington, D.C. : Optica Publishing Group, 2023. http://dx.doi.org/10.1364/cleo_fs.2023.ff1d.6.

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Direct nanoimaging of helicity-dependent photocurrents is important to understand light-matter interaction in topological materials. Here we report visualization of circular polarization dependent surface currents and their distribution on plain and artificially nanostructured topological insulators.
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Liao, Chen-Ting, Guan Gui, Nathan J. Brooks, Bin Wang, Henry C. Kapteyn et Margaret M. Murnane. « Single-frame measurement of ultrafast spatiotemporal vortex pulses ». Dans Frontiers in Optics. Washington, D.C. : Optica Publishing Group, 2022. http://dx.doi.org/10.1364/fio.2022.fm4e.3.

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We demonstrated a simple method to quantitatively characterize the spatiotemporal orbital angular momentum (ST-OAM) of light. Our method can measure the presence of ST-OAM, space-time topological charges, OAM helicity, pulse dispersion, and beam divergence.
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Avci, E., C. M. Macdonald et I. Meglinski. « Helicity of circular polarized light backscattered from biological tissues influenced by optical clearing ». Dans Saratov Fall Metting 2011, sous la direction de Valery V. Tuchin, Elina A. Genina et Igor V. Meglinski. SPIE, 2012. http://dx.doi.org/10.1117/12.923731.

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Dorokhov, A. E. « Instanton-induced helicity and flavor asymmetries in the light quark sea of the nucleon ». Dans The 11th International symposium on high energy spin physics. AIP, 1995. http://dx.doi.org/10.1063/1.48936.

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