Magnetic and Electric Transverse Spin Density of Spatially Confined Light

  title={Magnetic and Electric Transverse Spin Density of Spatially Confined Light},
  author={Martin J. Neugebauer and Jorg S. Eismann and Thomas Bauer and Peter Banzer},
  journal={Physical Review X},
When a beam of light is laterally confined, its field distribution can exhibit points where the local magnetic and electric field vectors spin in a plane containing the propagation direction of the electromagnetic wave. The phenomenon indicates the presence of a non-zero transverse spin density. Here, we experimentally investigate this transverse spin density of both magnetic and electric fields, occurring in highly-confined structured fields of light. Our scheme relies on the utilization of a… 

Figures from this paper

Detecting the transverse spin density of light via electromagnetically induced transparency.

For light that is transversely confined, its field vector spins in a plane not orthogonal to the propagation direction, leading to the presence of transverse spin, which plays a fundamental role in

Mapping the near-field spin angular momenta in the structured surface plasmon polariton field.

A scanning imaging technique which can map the near-field distributions of the optical spin angular momenta with an achiral dielectric nanosphere and can be utilized to reconstruct the photonic Skyrmion and other photonic topological structures is proposed and is expected to be valuable for the study of near- field spin optics and topological photonics.

1 2 M ar 2 02 1 Imaging the transverse spin density of light via electromagnetically induced transparency

When a light beam is strongly laterally confined, its field vector spins in a plane not perpendicular to the propagation direction, leading to the presence of transverse spin angular momentum, which

Spin angular momentum in planar and cylindrical waveguides induced by transverse confinement and intrinsic helicity of guided light.

In recent years, extraordinary spin angular momenta have been investigated in a variety of structured electromagnetic waves, being of especial interest in sub-wavelength evanescent fields. Here we

Spin/momentum properties of the paraxial optical beams

: Spin angular momentum, an elementary dynamical property of classical electromagnetic fields, plays an important role in spin–orbit and light–matter interactions, especially in near-field optics.

Transverse photon spin of bulk electromagnetic waves in bianisotropic media

Photons possess spin degree of freedom, which plays an important role in various applications such as optical communications, information processing and sensing. In isotropic media, photon spin is

Huygens' dipole for polarization-controlled nanoscale light routing

Structured illumination allows for satisfying the first Kerker condition of in-phase perpendicular electric and magnetic dipole moments in any isotropic scatterer that supports electric and magnetic

Spin and orbital angular momenta of acoustic beams

We analyze spin and orbital angular momenta in monochromatic acoustic wave fields in a homogeneous medium. Despite being purely longitudinal (curl-free), inhomogeneous acoustic waves generically

Spin-resolved near-field scanning optical microscopy for mapping of the spin angular momentum distribution of focused beams

We proposed and built a near-field scanning optical microscope (NSOM) to enable the characterization of the spin angular momentum (SAM) distribution of electromagnetic fields with nanoscale



Measuring the transverse spin density of light.

The longitudinal electric component of Belinfante's elusive spin momentum density is determined, a solenoidal field quantity often referred to as "virtual" in this work.

Magnetic spin-orbit interaction directs Bloch surface waves

We study the directional excitation of optical surface waves controlled by the magnetic field of light. We theoretically predict that a spinning magnetic dipole develops a tunable unidirectional

Tightly focused optical field with controllable photonic spin orientation.

This work develops a method to achieve controllable photonic spin orientation within a diffraction limited optical focal spot produced by a high numerical aperture objective lens using Richard-Wolf vectorial diffraction theory.

Light emission by magnetic and electric dipoles close to a plane dielectric interface. II. Radiation patterns of perpendicular oriented dipoles

We have derived analytical expressions for the angular distribution P(α) of the power radiated by magnetic or electric dipoles located at distance z0 from a dielectric interface and oriented

Transverse spin and momentum in two-wave interference

We analyze the interference field formed by two electromagnetic plane waves (with the same frequency but different wave vectors), and find that such field reveals a rich and highly non-trivial

Magnetoelectric effects in local light-matter interactions.

A concept of "magnetoelectric energy density" is put forward, quantifying the local PT symmetry of the field, which is responsible for electric-magnetic asymmetry, chirality, and the nonreciprocal magnetoelectrics effect in nanoparticles or molecules.

Spin-orbit interactions of light

This Review article provides an overview of the fundamental origins and important applications of the main spin–orbit interaction phenomena in modern optics that play a crucial role at subwavelength

Transverse and longitudinal angular momenta of light

Optical forces on small magnetodielectric particles.

The origin and significance of the self-interaction force between both dipoles is discussed in connection with that of the angular distribution of scattered light and of the extinction cross section.

Transverse spin and transverse momentum in scattering of plane waves.

It is demonstrated that the interference of the transverse electric and transverse magnetic scattering modes enhances both the magnitudes and the spatial extent of thetransverse SAM and theTransverse momentum components.