ORCID Profile
0000-0003-0080-1062
Current Organisations
RIKEN Center for Emergent Matter Science
,
University of Valencia
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Publisher: American Association for the Advancement of Science (AAAS)
Date: 16-04-2021
Abstract: Fast-spinning discs on a liquid surface propagate along arbitrarily shaped boundaries, making a new type of surface vehicles.
Publisher: American Physical Society (APS)
Date: 22-06-2010
Publisher: American Physical Society (APS)
Date: 29-05-2007
Publisher: American Physical Society (APS)
Date: 24-03-2010
Publisher: Elsevier BV
Date: 02-2006
Publisher: OSA
Date: 2017
Publisher: The Optical Society
Date: 21-09-2016
Publisher: American Physical Society (APS)
Date: 28-07-2006
Publisher: IOP Publishing
Date: 22-08-2023
Abstract: We examine properties of the energy-density and photon-probability centroids of electromagnetic wavepackets in free space. In the second-order paraxial approximation, both of these centroids propagate with the same subluminal velocity because of the transverse confinement of the wavepacket and its diffraction. The tiny difference between the energy and probability centroid velocities appears only in the fourth order. We consider three types of wavepackets: Gaussian, Bessel, and non-diffracting Bessel. In all these cases, the subluminal propagation is clearly visible in the intensity distributions and can be measured experimentally in both classical-light and single-photon regimes. For Gaussian wavepackets, the half-wavelength delay is accumulated after propagation over about 12 Rayleigh lengths.
Publisher: The Optical Society
Date: 07-12-2011
DOI: 10.1364/OE.19.026132
Publisher: American Physical Society (APS)
Date: 16-03-2023
Publisher: Pleiades Publishing Ltd
Date: 07-2001
DOI: 10.1134/1.1391521
Publisher: American Physical Society (APS)
Date: 21-11-2006
Publisher: IOP Publishing
Date: 24-09-2014
Publisher: Elsevier BV
Date: 05-2017
Publisher: American Physical Society (APS)
Date: 21-03-2012
Publisher: AIP
Date: 2008
DOI: 10.1063/1.2909096
Publisher: IOP Publishing
Date: 2013
Publisher: Springer Science and Business Media LLC
Date: 08-08-2014
DOI: 10.1038/NCOMMS5586
Abstract: Landau levels and states of electrons in a magnetic field are fundamental quantum entities underlying the quantum Hall and related effects in condensed matter physics. However, the real-space properties and observation of Landau wave functions remain elusive. Here we report the real-space observation of Landau states and the internal rotational dynamics of free electrons. States with different quantum numbers are produced using nanometre-sized electron vortex beams, with a radius chosen to match the waist of the Landau states, in a quasi-uniform magnetic field. Scanning the beams along the propagation direction, we reconstruct the rotational dynamics of the Landau wave functions with angular frequency ~100 GHz. We observe that Landau modes with different azimuthal quantum numbers belong to three classes, which are characterized by rotations with zero, Larmor and cyclotron frequencies, respectively. This is in sharp contrast to the uniform cyclotron rotation of classical electrons, and in perfect agreement with recent theoretical predictions.
Publisher: American Physical Society (APS)
Date: 17-08-2022
Publisher: Pleiades Publishing Ltd
Date: 2002
DOI: 10.1134/1.1448603
Publisher: American Physical Society (APS)
Date: 17-10-2011
Publisher: American Physical Society (APS)
Date: 30-03-2015
Publisher: American Physical Society (APS)
Date: 23-01-2017
Publisher: Springer Science and Business Media LLC
Date: 14-11-2016
DOI: 10.1038/NCOMMS13488
Abstract: Quantum weak measurements, wavepacket shifts and optical vortices are universal wave phenomena, which originate from fine interference of multiple plane waves. These effects have attracted considerable attention in both classical and quantum wave systems. Here we report on a phenomenon that brings together all the above topics in a simple one-dimensional scalar wave system. We consider inelastic scattering of Gaussian wave packets with parameters close to a zero of the complex scattering coefficient. We demonstrate that the scattered wave packets experience anomalously large time and frequency shifts in such near-zero scattering. These shifts reveal close analogies with the Goos–Hänchen beam shifts and quantum weak measurements of the momentum in a vortex wavefunction. We verify our general theory by an optical experiment using the near-zero transmission (near-critical coupling) of Gaussian pulses propagating through a nano-fibre with a side-coupled toroidal micro-resonator. Measurements demonstrate the lification of the time delays from the typical inverse-resonator-linewidth scale to the pulse-duration scale.
Publisher: American Physical Society (APS)
Date: 31-08-2016
Publisher: JSTOR
Date: 1989
DOI: 10.2307/1591083
Publisher: American Physical Society (APS)
Date: 10-2008
Publisher: American Physical Society (APS)
Date: 15-06-2018
Publisher: American Physical Society (APS)
Date: 16-06-2021
Publisher: IOP Publishing
Date: 04-08-2023
Abstract: Spatiotemporal sculpturing of light pulse with ultimately sophisticated structures represents a major goal of the everlasting pursue of ultra-fast information transmission and processing as well as ultra-intense energy concentration and extraction. It also holds the key to unlock new extraordinary fundamental physical effects. Traditionally, spatiotemporal light pulses are always treated as spatiotemporally separable wave packet as solution of the Maxwell’s equations. In the past decade, however, more generalized forms of spatiotemporally nonseparable solution started to emerge with growing importance for their striking physical effects. This roadmap intends to highlight the recent advances in the creation and control of increasingly complex spatiotemporally sculptured pulses, from spatiotemporally separable to complex nonseparable states, with erse geometric and topological structures, presenting a bird’s eye viewpoint on the zoology of spatiotemporal light fields and the outlook of future trends and open challenges.
Publisher: American Physical Society (APS)
Date: 17-04-2018
Publisher: IEEE
Date: 09-2010
Publisher: American Physical Society (APS)
Date: 21-12-2010
Publisher: Springer Science and Business Media LLC
Date: 06-03-2014
DOI: 10.1038/NCOMMS4300
Abstract: Momentum and spin represent fundamental dynamic properties of quantum particles and fields. In particular, propagating optical waves (photons) carry momentum and longitudinal spin determined by the wave vector and circular polarization, respectively. Here we show that exactly the opposite can be the case for evanescent optical waves. A single evanescent wave possesses a spin component, which is independent of the polarization and is orthogonal to the wave vector. Furthermore, such a wave carries a momentum component, which is determined by the circular polarization and is also orthogonal to the wave vector. We show that these extraordinary properties reveal a fundamental Belinfante's spin momentum, known in field theory and unobservable in propagating fields. We demonstrate that the transverse momentum and spin push and twist a probe Mie particle in an evanescent field. This allows the observation of 'impossible' properties of light and of a fundamental field-theory quantity, which was previously considered as 'virtual'.
Publisher: Springer Science and Business Media LLC
Date: 27-11-2015
Publisher: The Optical Society
Date: 2004
Publisher: AIP Publishing
Date: 21-10-2002
DOI: 10.1063/1.1506954
Abstract: A linear set of ordinary differential equations with a matrix depending on a set of adiabatically varying parameters is considered. Its asymptotic solutions are constructed to an arbitrary accuracy in the adiabaticity parameter ε. By extending the phase space of the system not only with the space of parameters, like in the theory of Berry’s phase, but also with the space of their derivatives, it proves possible to represent the phase of the solution as a sum of the dynamic phase and a generalized geometric phase (determined by a contour integral in the space of parameters and derivatives). Hence, it is possible to obtain the asymptotic results to any degree of accuracy in ε, while earlier they were obtainable only in the first-order adiabatic approximation. Namely, for linear oscillatory adiabatic systems, the quantizability, parametric stability, and the Hamiltonian nature of the system are equivalent properties. As a consequence, one can obtain the well-known result regarding conservation with accuracy to any power of ε of adiabatic invariants in a Hamiltonian system on a torus. An important point is that the generalized geometric phase can appear, in contrast to Berry’s phase, with only one real varying parameter.
Publisher: American Physical Society (APS)
Date: 05-11-2007
Publisher: American Physical Society (APS)
Date: 28-10-2019
Publisher: Elsevier BV
Date: 09-2005
Publisher: American Physical Society (APS)
Date: 26-11-2012
Publisher: IOP Publishing
Date: 04-08-2009
Publisher: Informa UK Limited
Date: 2003
Publisher: Elsevier BV
Date: 06-2018
Publisher: American Physical Society (APS)
Date: 19-09-2012
Publisher: AIP Publishing
Date: 07-2012
DOI: 10.1063/1.4736617
Abstract: This is a review of some recent (mostly ours) results on Anderson localization of light and electron waves in complex disordered systems, including: (i) left-handed metamaterials, (ii) magnetoactive optical structures, (iii) graphene superlattices, and (iv) nonlinear dielectric media. First, we demonstrate that left-handed metamaterials can significantly suppress localization of light and lead to an anomalously enhanced transmission. This suppression is essential at the long-wavelength limit in the case of normal incidence, at specific angles of oblique incidence (Brewster anomaly), and in vicinity of zero-ɛ or zero-μ frequencies for dispersive metamaterials. Remarkably, in disordered s les comprised of alternating normal and left-handed metamaterials, the reciprocal Lyapunov exponent and reciprocal transmittance increment can differ from each other. Second, we study magnetoactive multilayered structures, which exhibit nonreciprocal localization of light depending on the direction of propagation and on polarization. At resonant frequencies or realizations such nonreciprocity results in effectively unidirectional transport of light. Third, we discuss the analogy between wave propagation through multilayered s les with metamaterials and charge transport in graphene, which provides a simple physical explanation of unusual conductive properties of disordered graphene superlatices. We predict disorder-induced resonance of the transmission coefficient at oblique incidence of Dirac quasiparticles. Finally, we demonstrate that an interplay of nonlinearity and disorder in dielectric media can lead to bistability of in idual localized states excited inside the medium at resonant frequencies. This results in nonreciprocity of wave transmission and unidirectional transport of light.
Publisher: American Physical Society (APS)
Date: 16-07-2008
Publisher: American Physical Society (APS)
Date: 14-12-2006
Publisher: OSA
Date: 2010
Publisher: SPIE
Date: 15-08-2011
DOI: 10.1117/12.903380
Publisher: The Optical Society
Date: 12-2008
Publisher: Elsevier BV
Date: 12-2004
Publisher: AIP Publishing
Date: 2002
DOI: 10.1063/1.1418718
Abstract: Considered is a linear set of ordinary differential equations with a matrix depending on a set of adiabatically varying parameters. Asymptotic solutions have been constructed. As has been shown, an important characteristic determining the qualitative portrait of the system is the real part of Berry’s complex geometric phase, which we call the geometric litude. For systems with purely imaginary eigenvalues the equivalence has been proven in the adiabatic approximation of system sets without geometric litude, Hamiltonian systems, quantizable systems, and strongly stable systems. Classification of the systems without geometric litude is given with respect to the kind of matrix of the initial system.
Publisher: Springer Science and Business Media LLC
Date: 04-02-2019
DOI: 10.1038/S41467-019-08397-6
Abstract: Maxwell electromagnetism, describing the wave properties of light, was formulated 150 years ago. More than 60 years ago it was shown that interfaces between optical media (including dielectrics, metals, negative-index materials) can support surface electromagnetic waves, which now play crucial roles in plasmonics, metamaterials, and nano-photonics. Here we show that surface Maxwell waves at interfaces between homogeneous isotropic media described by real permittivities and permeabilities have a topological origin explained by the bulk-boundary correspondence. Importantly, the topological classification is determined by the helicity operator, which is generically non-Hermitian even in lossless optical media. The corresponding topological invariant, which determines the number of surface modes, is a $${\\Bbb Z}_4$$ Z 4 number (or a pair of $${\\Bbb Z}_2$$ Z 2 numbers) describing the winding of the complex helicity spectrum across the interface. Our theory provides a new twist and insights for several areas of wave physics: Maxwell electromagnetism, topological quantum states, non-Hermitian wave physics, and metamaterials.
Publisher: Informa UK Limited
Date: 07-2004
Publisher: The Optical Society
Date: 26-09-2007
Abstract: The equation for evolution of the four-component Stokes vector in weakly anisotropic and smoothly inhomogeneous media is derived on the basis of a quasi-isotropic approximation of the geometrical optics method, which provides the consequent asymptotic solution of Maxwell's equations. Our equation generalizes previous results obtained for the normal propagation of electromagnetic waves in stratified media. It is valid for curvilinear rays with torsion and is capable of describing normal mode conversion in inhomogeneous media. Remarkably, evolution of the four-component Stokes vector is described by the Bargmann-Michel-Telegdi equation for relativistic spin precession, whereas the equation for the three-component Stokes vector resembles the Landau-Lifshitz equation describing spin precession in ferromagnetic systems. The general theory is applied for analysis of polarization evolution in a magnetized plasma. We also emphasize fundamental features of the non-Abelian polarization evolution in anisotropic inhomogeneous media and illustrate them by simple ex les.
Publisher: The Optical Society
Date: 13-03-2013
DOI: 10.1364/OE.21.007082
Publisher: American Physical Society (APS)
Date: 07-06-2012
Publisher: American Association for the Advancement of Science (AAAS)
Date: 21-01-2022
Abstract: Spin is a fundamental yet nontrivial intrinsic angular momentum property of quantum particles or fields, which appears within relativistic field theory. The spin density in wave fields is described by the theoretical Belinfante-Rosenfeld construction based on the difference between the canonical and kinetic momentum densities. These quantities are usually considered as abstract and non-observable per se. Here, we demonstrate, both theoretically and experimentally, that the Belinfante-Rosenfeld construction naturally arises in gravity (water surface) waves. There, the canonical momentum is associated with the generalized Stokes drift phenomenon, while the spin is generated by subwavelength circular motion of water particles. Thus, we directly observe these fundamental field theory properties as microscopic mechanical properties of a classical wave system. Our findings shed light onto the nature of spin and momentum in wave fields, demonstrate the universality of relativistic field theory concepts, and offer a new platform for their studies.
Publisher: Elsevier BV
Date: 06-2005
Publisher: American Physical Society (APS)
Date: 08-2019
Publisher: American Physical Society (APS)
Date: 21-01-2009
Publisher: American Physical Society (APS)
Date: 23-08-2004
Publisher: The Optical Society
Date: 16-02-2018
DOI: 10.1364/OL.43.000963
Publisher: SPIE
Date: 16-05-2017
DOI: 10.1117/12.2261663
Publisher: The Optical Society
Date: 30-01-2009
DOI: 10.1364/OL.34.000389
Abstract: We study, analytically and numerically, reflection and transmission of an arbitrarily polarized vortex beam on an interface separating two dielectric media and derive general expressions for linear and angular Goos-Hänchen (GH) and Imbert-Fedorov shifts. We predict a novel vortex-induced GH shift and also reveal a direct connection between the spin-induced angular shifts and the vortex-induced linear shifts.
Publisher: IOP Publishing
Date: 1999
Publisher: OSA
Date: 2009
Publisher: American Physical Society (APS)
Date: 24-09-2008
Publisher: Pleiades Publishing Ltd
Date: 06-2003
DOI: 10.1134/1.1591211
Publisher: Elsevier BV
Date: 08-2015
Publisher: Elsevier BV
Date: 08-2015
Publisher: Elsevier BV
Date: 09-2005
Publisher: American Physical Society (APS)
Date: 23-12-2020
Publisher: American Physical Society (APS)
Date: 20-07-2020
Publisher: Pleiades Publishing Ltd
Date: 09-2003
DOI: 10.1134/1.1618334
Publisher: IOP Publishing
Date: 05-2020
Abstract: We construct a novel Lagrangian representation of acoustic field theory that describes the local vector properties of longitudinal (curl-free) acoustic fields. In particular, this approach accounts for the recently-discovered nonzero spin angular momentum density in inhomogeneous sound fields in fluids or gases. The traditional acoustic Lagrangian representation with a scalar potential is unable to describe such vector properties of acoustic fields adequately, which are however observable via local radiation forces and torques on small probe particles. By introducing a displacement vector potential analogous to the electromagnetic vector potential, we derive the appropriate canonical momentum and spin densities as conserved Noether currents. The results are consistent with recent theoretical analyses and experiments. Furthermore, by an analogy with dual-symmetric electromagnetic field theory that combines electric- and magnetic-potential representations, we put forward an acoustic spinor representation combining the scalar and vector representations. This approach also includes naturally coupling to sources. The strong analogies between electromagnetism and acoustics suggest further productive inquiry, particularly regarding the nature of the apparent spacetime symmetries inherent to acoustic fields.
Publisher: American Physical Society (APS)
Date: 09-04-2009
Publisher: Elsevier BV
Date: 2008
Publisher: American Physical Society (APS)
Date: 05-07-2012
Publisher: American Physical Society (APS)
Date: 23-02-2006
Publisher: IEEE
Date: 08-2016
Publisher: IOP Publishing
Date: 04-2013
Publisher: Uspekhi Fizicheskikh Nauk (UFN) Journal
Date: 30-04-2004
Publisher: American Physical Society (APS)
Date: 20-03-2014
Publisher: IOP Publishing
Date: 06-12-2017
Publisher: The Electromagnetics Academy
Date: 2005
Publisher: IOP Publishing
Date: 10-2005
Publisher: American Physical Society (APS)
Date: 28-08-2017
Publisher: American Physical Society (APS)
Date: 23-02-2011
Publisher: American Physical Society (APS)
Date: 21-05-2019
Publisher: Springer Science and Business Media LLC
Date: 23-11-2008
Publisher: The Optical Society
Date: 06-2006
Abstract: We present an ab initio account of the paraxial complex geometrical optics (CGO) in application to scalar Gaussian beam propagation and diffraction in a 3D smoothly inhomogeneous medium. The paraxial CGO deals with quadratic expansion of the complex eikonal and reduces the wave problem to the solution of ordinary differential equations of the Riccati type. This substantially simplifies the description of Gaussian beam diffraction as compared with full-wave or parabolic (quasi-optics) equations. For a Gaussian beam propagating in a homogeneous medium or along the symmetry axis in a lenslike medium, the CGO equations possess analytical solutions otherwise, they can be readily solved numerically. As a nontrivial ex le we consider Gaussian beam propagation and diffraction along a helical ray in an axially symmetric waveguide medium. It is shown that the major axis of the beam's elliptical cross section grows unboundedly it is oriented predominantly in the azimuthal (binormal) direction and does not obey the parallel-transport law.
Publisher: Elsevier BV
Date: 03-2005
Publisher: Springer Science and Business Media LLC
Date: 10-2015
DOI: 10.1038/NATURE15522
Abstract: Exciton-polaritons are hybrid light-matter quasiparticles formed by strongly interacting photons and excitons (electron-hole pairs) in semiconductor microcavities. They have emerged as a robust solid-state platform for next-generation optoelectronic applications as well as for fundamental studies of quantum many-body physics. Importantly, exciton-polaritons are a profoundly open (that is, non-Hermitian) quantum system, which requires constant pumping of energy and continuously decays, releasing coherent radiation. Thus, the exciton-polaritons always exist in a balanced potential landscape of gain and loss. However, the inherent non-Hermitian nature of this potential has so far been largely ignored in exciton-polariton physics. Here we demonstrate that non-Hermiticity dramatically modifies the structure of modes and spectral degeneracies in exciton-polariton systems, and, therefore, will affect their quantum transport, localization and dynamical properties. Using a spatially structured optical pump, we create a chaotic exciton-polariton billiard--a two-dimensional area enclosed by a curved potential barrier. Eigenmodes of this billiard exhibit multiple non-Hermitian spectral degeneracies, known as exceptional points. Such points can cause remarkable wave phenomena, such as unidirectional transport, anomalous lasing/absorption and chiral modes. By varying parameters of the billiard, we observe crossing and anti-crossing of energy levels and reveal the non-trivial topological modal structure exclusive to non-Hermitian systems. We also observe mode switching and a topological Berry phase for a parameter loop encircling the exceptional point. Our findings pave the way to studies of non-Hermitian quantum dynamics of exciton-polaritons, which may uncover novel operating principles for polariton-based devices.
Publisher: American Physical Society (APS)
Date: 21-06-2007
Publisher: World Scientific Pub Co Pte Lt
Date: 20-12-2002
DOI: 10.1142/S0217979202014930
Abstract: The paper deals with influence of two-scale variations of parameters on the behavior of different dynamical systems. By two-scale we mean parameter oscillations occur in an alternating manner with large and small temporal gradient, on a typical period intervals. The shape of such parameter dependence resembles relaxation oscillations. Parametric instability is revealed under these conditions. We call it two-scale geometric resonance (TGR). TGR can be described with the help of certain geometric structures on the extended phase space. TGR possesses similar properties and can be described in similar ways in seemingly different systems. The article presents general models for the TGR description and considers a few specific ex les: classical oscillator, Van-der-Pol oscillator and thermodynamic system with ideal gas.
Publisher: Elsevier BV
Date: 02-2019
Publisher: Pleiades Publishing Ltd
Date: 06-2004
DOI: 10.1134/1.1787097
Publisher: IOP Publishing
Date: 20-03-2013
Publisher: IOP Publishing
Date: 30-10-2019
Abstract: Geometric phases are a universal concept that underpins numerous phenomena involving multi-component wave fields. These polarization-dependent phases are inherent in interference effects, spin-orbit interaction phenomena, and topological properties of vector wave fields. Geometric phases have been thoroughly studied in two-component fields, such as two-level quantum systems or paraxial optical waves. However, their description for fields with three or more components, such as generic nonparaxial optical fields routinely used in modern nano-optics, constitutes a nontrivial problem. Here we describe geometric, dynamical, and total phases calculated along a closed spatial contour in a multi-component complex field, with particular emphasis on 2D (paraxial) and 3D (nonparaxial) optical fields. We present several equivalent approaches: (i) an algebraic formalism, universal for any multi-component field (ii) a dynamical approach using the Coriolis coupling between the spin angular momentum and reference-frame rotations and (iii) a geometric representation, which unifies the Pancharatnam-Berry phase for the 2D polarization on the Poincaré sphere and the Majorana-sphere representation for the 3D polarized fields. Most importantly, we reveal close connections between geometric phases, angular-momentum properties of the field, and topological properties of polarization singularities in 2D and 3D fields, such as C-points and polarization Möbius strips.
Publisher: Springer Science and Business Media LLC
Date: 21-02-2022
Publisher: American Physical Society (APS)
Date: 30-07-2018
Publisher: American Physical Society (APS)
Date: 25-02-2013
Publisher: IOP Publishing
Date: 30-08-2023
Abstract: Structured waves are ubiquitous for all areas of wave physics, both classical and quantum, where the wavefields are inhomogeneous and cannot be approximated by a single plane wave. Even the interference of two plane waves, or of a single inhomogeneous (evanescent) wave, provides a number of nontrivial phenomena and additional functionalities as compared to a single plane wave. Complex wavefields with inhomogeneities in the litude, phase, and polarization, including topological––––– structures and singularities, underpin modern nanooptics and photonics, yet they are equally important, e.g. for quantum matter waves, acoustics, water waves, etc. Structured waves are crucial in optical and electron microscopy, wave propagation and scattering, imaging, communications, quantum optics, topological and non-Hermitian wave systems, quantum condensed-matter systems, optomechanics, plasmonics and metamaterials, optical and acoustic manipulation, and so forth. This Roadmap is written collectively by prominent researchers and aims to survey the role of structured waves in various areas of wave physics. Providing background, current research, and anticipating future developments, it will be of interest to a wide cross-disciplinary audience.
Publisher: American Physical Society (APS)
Date: 07-07-2005
Publisher: American Physical Society (APS)
Date: 27-12-2004
Publisher: The Optical Society
Date: 20-08-2018
Publisher: OSA
Date: 2009
Publisher: SPIE
Date: 10-02-2011
DOI: 10.1117/12.873818
Publisher: Elsevier BV
Date: 04-2009
Publisher: IOP Publishing
Date: 29-01-2003
Publisher: OSA
Date: 2006
Publisher: AIP Publishing
Date: 07-2021
DOI: 10.1063/5.0056333
Abstract: We show that polarization singularities, generic for any complex vector field but so far mostly studied for electromagnetic fields, appear naturally in inhomogeneous yet monochromatic sound and water-surface (e.g., gravity or capillary) wave fields in fluids or gases. The vector properties of these waves are described by the velocity or displacement fields characterizing the local oscillatory motion of the medium particles. We consider a number of ex les revealing C-points of purely circular polarization and polarization Möbius strips (formed by major axes of polarization ellipses) around the C-points in sound and gravity wave fields. Our results (i) offer a new readily accessible platform for studies of polarization singularities and topological features of complex vector wave fields and (ii) can play an important role in characterizing vector (e.g., dipole) wave–matter interactions in acoustics and fluid mechanics.
Publisher: Springer Science and Business Media LLC
Date: 21-12-2020
Publisher: American Physical Society (APS)
Date: 10-11-2022
Publisher: American Physical Society (APS)
Date: 08-11-2022
Publisher: American Physical Society (APS)
Date: 27-06-2022
Publisher: Institute of Physical Optics
Date: 2018
Publisher: Walter de Gruyter GmbH
Date: 23-08-2021
Abstract: Transverse (Hall-effect) and Goos–Hänchen shifts of light beams reflected/refracted at planar interfaces are important wave phenomena, which can be significantly modified and enhanced by the presence of intrinsic orbital angular momentum (OAM) in the beam. Recently, optical spatiotemporal vortex pulses (STVPs) carrying a purely transverse intrinsic OAM were predicted theoretically and generated experimentally. Here we consider the reflection and refraction of such pulses at a planar isotropic interface. We find theoretically and confirm numerically novel types of OAM-dependent transverse and longitudinal pulse shifts. Remarkably, the longitudinal shifts can be regarded as time delays, which appear, in contrast to the well-known Wigner time delay, without temporal dispersion of the reflection/refraction coefficients. Such time delays allow one to realize OAM-controlled slow (subluminal) and fast (superluminal) pulse propagation without medium dispersion. These results can have important implications in various problems involving scattering of localized vortex states carrying transverse OAM.
Publisher: American Physical Society (APS)
Date: 03-01-2019
Publisher: IOP Publishing
Date: 29-09-2022
Abstract: We consider reflection and transmission of 2D quantum wavepackets with phase vortices (also known in optics as spatiotemporal vortex pulses) at potential step-like, delta-function, and rectangular barriers. The presence of a vortex significantly modifies the Wigner time delays and Goos–Hänchen shifts, previously studied for Gaussian-like wavepackets. In particular, the scattered wavepackets undergo non-zero time delays and lateral shifts even for purely real scattering coefficients, when the standard Wigner and Artmann formulae vanish. We derive analytical expressions for the vortex-induced times delays and spatial shifts and verify these with numerical calculations of the Schrödinger equation. The time delays and shifts are resonantly enhanced in the vicinity of the critical-angle incidence for a step-like potential and near transmission resonances for a rectangular barrier.
Publisher: The Optical Society
Date: 2008
DOI: 10.1364/OE.16.000695
Abstract: We describe the evolution of a paraxial electromagnetic wave characterizing by a non-uniform polarization distribution with singularities and propagating in a weakly anisotropic medium. Our approach is based on the Stokes vector evolution equation applied to a non-uniform initial polarization field. In the case of a homogeneous medium, this equation is integrated analytically. This yields a 3-dimensional distribution of the polarization parameters containing singularities, i.e. C-lines of circular polarization and L-surfaces of linear polarization. The general theory is applied to specific ex les of the unfolding of a vectorial vortex in birefringent and dichroic media.
Publisher: Springer Science and Business Media LLC
Date: 25-04-2016
DOI: 10.1038/NPHYS3732
Publisher: Pleiades Publishing Ltd
Date: 11-2003
DOI: 10.1134/1.1624458
Publisher: The Optical Society
Date: 24-09-2019
DOI: 10.1364/OL.44.004781
Publisher: Uspekhi Fizicheskikh Nauk (UFN) Journal
Date: 2004
Publisher: American Association for the Advancement of Science (AAAS)
Date: 26-06-2015
Abstract: Interpreting recent experimental results of light interactions with matter shows that the classical Maxwell theory of light has intrinsic quantum spin Hall effect properties even in free space. Complex effects in condensed-matter systems can often find analogs in cleaner optical systems. Bliokh et al. argue that the optical systems exhibiting such complex phenomena should also be simpler (see the Perspective by Stone). Their theoretical study shows that free-space light has a nonzero topological spin Chern number and thus should have counterpropagating surface modes. Such modes are actually well known and can be described as evanescent modes of Maxwell equations. Science , this issue p. 1448 see also p. 1432
Publisher: IOP Publishing
Date: 09-07-2013
Publisher: SPIE
Date: 04-03-2016
DOI: 10.1117/12.2217685
Publisher: American Physical Society (APS)
Date: 18-08-2017
Publisher: American Physical Society (APS)
Date: 16-07-2014
Publisher: IEEE
Date: 05-2015
Publisher: American Physical Society (APS)
Date: 26-01-2012
Location: Spain
No related grants have been discovered for Oscar Lecuona.