A5081616947- Orbital Angular Momentum in Optics
- Quantum optics and atomic interactions
- Mechanical and Optical Resonators
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Information and Cryptography
- Metamaterials and Metasurfaces Applications
- Plasmonic and Surface Plasmon Research
- Photonic and Optical Devices
- Random lasers and scattering media
- Topological Materials and Phenomena
- Nonlinear Photonic Systems
- Quantum and Classical Electrodynamics
- Quantum Mechanics and Non-Hermitian Physics
- Photonic Crystals and Applications
- Geophysics and Sensor Technology
- Quantum chaos and dynamical systems
- Near-Field Optical Microscopy
- Advanced Fiber Laser Technologies
- Quantum and electron transport phenomena
- Microfluidic and Bio-sensing Technologies
- Quantum, superfluid, helium dynamics
- Experimental and Theoretical Physics Studies
- Magneto-Optical Properties and Applications
- Optical and Acousto-Optic Technologies
- Optical Polarization and Ellipsometry
Donostia International Physics Center
2023-2025
Pioneer (Japan)
2018-2024
RIKEN
2015-2024
Wako University
2023
Pioneer (United States)
2023
ITMO University
2020
Australian National University
2008-2019
RIKEN Center for Emergent Matter Science
2015-2018
University of Michigan
2017
Nitto RIKEN (Japan)
2015-2016
Maxwell's equations, formulated 150 years ago, ultimately describe properties of light, from classical electromagnetism to quantum and relativistic aspects. The latter ones result in remarkable geometric topological phenomena related the spin-1 massless nature photons. By analyzing fundamental spin Maxwell waves, we show that free-space light exhibits an intrinsic Hall effect, i.e., surface modes with strong spin-momentum locking. These are evanescent waves form, e.g., plasmon-polaritons at...
We analyze chiral topological edge modes in a non-Hermitian variant of the 2D Dirac equation. Such appear at interfaces between media with different "masses" and/or signs "non-Hermitian charge." The existence these is intimately related to exceptional points bulk Hamiltonians, i.e., degeneracies spectra media. find that can be divided into three families ("Hermitian-like," "non-Hermitian," and "mixed"); are characterized by two winding numbers, describing distinct kinds half-integer charges...
We present a solution to the problem of reflection and refraction polarized Gaussian beam on interface between two transparent media. The transverse shifts beams' centers gravity are calculated. They always satisfy total angular momentum conservation law for beams, but, in general, do not laws individual photons as consequence lack "which path" information two-channel wave scattering. field structure reflected refracted beams is analyzed. In scattering linearly beam, opposite helicities...
We consider reflection and transmission of polarized paraxial light beams at a plane dielectric interface. The field transformations taking into account finite beam width are described based on the plane-wave representation geometric rotations. Using geometrical-optics coordinate frames accompanying beams, we construct an effective Jones matrix characterizing spatial-dispersion properties This results in unified self-consistent description Goos–Hänchen Imbert–Fedorov shifts (the latter being...
The dual symmetry between electric and magnetic fields is an important intrinsic property of Maxwell equations in free space. This underlies the conservation optical helicity and, as we show here, closely related to separation spin orbital degrees freedom light (the flux coincides with angular momentum). However, standard field-theory formulation electromagnetism, field Lagrangian not symmetric. leads problematic dual-asymmetric forms canonical energy–momentum, angular-momentum tensors....
We examine the spin-orbit coupling effects that appear when a wave carrying intrinsic angular momentum interacts with medium. The Berry phase is shown to be manifestation of Coriolis effect in noninertial reference frame attached wave. In most general case, both direction propagation and state are varied, given by simple expression unifies spin redirection Pancharatnam-Berry phase. theory supported experiment demonstrating electromagnetic waves via surface plasmon nanostructure. measurements...
We consider a $p$-polarized surface electromagnetic wave (a classical polariton) at the interface between vacuum and metal or left-handed medium. show that evanescent waves forming polariton inevitably possess backward spin energy flow, which, together with superluminal orbital form total Poynting vector. This flow generates well-defined (but not quantized) angular momentum of polaritons which is orthogonal to propagation direction. The arises from imaginary longitudinal component electric...
We consider semiclassical higher-order wave packet solutions of the Schrödinger equation with phase vortices. The vortex line is aligned propagation direction, and carries a well-defined orbital angular momentum (OAM) variant Planck's over 2pil (l strength) along its main linear momentum. probability current coils around in such OAM states electrons. In an electric field, these evolve like massless particles spin l. magnetic-monopole Berry curvature appears space, which results...
We review optical phenomena associated with the internal energy redistribution which accompany propagation and transformations of monochromatic light fields in homogeneous media. The total flow (linear-momentum density, Poynting vector) can be divided into spin part polarization orbital spatial inhomogeneity. give general description flows coordinate momentum (angular spectrum) representations for both nonparaxial paraxial fields. This enables one to determine local densities integral values...
We give an exact self-consistent operator description of the spin and orbital angular momenta, position, spin-orbit interactions nonparaxial light in free space. Both quantum-operator formalism classical energy-flow approach are presented. apply general theory to symmetric asymmetric Bessel beams exhibiting spin- orbital-dependent intensity profiles. The wave solutions clearly interpreted terms Berry phases, quantization caustics, Hall effects light, which can be readily observed experimentally.
We examine the recently introduced measure of chirality a monochromatic optical field [Y. Tang and A. E. Cohen, Phys. Rev. Lett. 104, 163901 (2010)] using momentum (plane-wave) representation helicity basis. Our analysis clarifies physical meaning unveils its close relation to polarization helicity, spin angular momentum, energy density, Poynting flow. derive operators corresponding chiral which acquire remarkably simple forms in representation.
We examine the momentum, spin, and orbital angular momentum of structured monochromatic optical fields in dispersive inhomogeneous isotropic media. There are two bifurcations this general problem: Abraham-Minkowski dilemma kinetic (Poynting-like) versus canonical (spin-orbital) pictures. show that Abraham describes energy flux group velocity wave medium. At same time, we introduce novel Minkowski-type densities field. These quantities exhibit fairly natural forms, analogous to Brillouin...
Recently, spatiotemporal optical vortex pulses carrying a purely transverse intrinsic orbital angular momentum were generated experimentally [{\it Optica} {\bf 6}, 1547 (2019); {\it Nat. Photon.} 14}, 350 (2020)]. However, an accurate theoretical analysis of such states and their angular-momentum properties remains elusive. Here we provide analysis, including scalar vector Bessel-type solutions as well descrption propagational, polarization, properties. Most importantly, calculate both local...
Abstract Spatiotemporal sculpturing of light pulse with ultimately sophisticated structures represents a major goal the everlasting pursue ultra-fast information transmission and processing as well ultra-intense energy concentration extraction. It also holds key to unlock new extraordinary fundamental physical effects. Traditionally, spatiotemporal pulses are always treated spatiotemporally separable wave packet solution Maxwell’s equations. In past decade, however, more generalized forms...
Abstract Structured waves are ubiquitous for all areas of wave physics, both classical and quantum, where the wavefields inhomogeneous cannot be approximated by a single plane wave. Even interference two waves, or (evanescent) wave, provides number nontrivial phenomena additional functionalities as compared to Complex with inhomogeneities in amplitude, phase, polarization, including topological structures singularities, underpin modern nanooptics photonics, yet they equally important, e.g....
Topological wave structures—phase vortices, skyrmions, merons, etc.—are attracting enormous attention in a variety of quantum and classical fields. Surprisingly, these structures have never been properly explored the most obvious example waves: water-surface (gravity-capillary) waves. Here, we fill this gap describe (i) water-wave vortices different orders carrying quantized angular momentum with orbital spin contributions, (ii) skyrmion lattices formed by instantaneous displacements...
Super-resolution, extraordinary transmission, total absorption, and localization of electromagnetic waves are currently attracting growing attention. These phenomena related to different physical systems usually studied within the context different, sometimes rather sophisticated, approaches. Remarkably, all these seemingly unrelated owe their origin same underlying mechanism, namely, wave interaction with an open resonator. Here we show that it is possible describe effects in a unified way,...