• Corpus ID: 238582641

Pure helicity vortex and spin-state-dependent quantum coherence in twisted light

  title={Pure helicity vortex and spin-state-dependent quantum coherence in twisted light},
  author={Li-Ping Yang and Dazhi Xu},
The topological charge of a photonic vortex is the essential quantity in singular optics and the critical parameter to characterize the vorticity of twisted light. However, the definition of the photonic topological charge remains elusive. Here, we put forth a theoretical formalism to provide a comprehensive treatment of photonic vortices. We introduce quantum operators for the photon current density and helicity current density based on the continuity equations from the paraxial Helmholtz… 

Figures from this paper


Non-classical photonic spin texture of quantum structured light
Classical structured light with controlled polarization and orbital angular momentum (OAM) of electromagnetic waves has varied applications in optical trapping, bio-sensing, optical communications
Particlelike Behavior of Topological Defects in Linear Wave Packets in Photonic Graphene.
This work studies the formation, evolution, and interaction of optical vortices in wave packets at the Dirac point in photonic graphene, and shows that while their exact behavior goes beyond theDirac equation and requires a full account of the lattice properties, it can be still approximately described by an effective theory.
Topological charge and angular momentum of light beams carrying optical vortices
We analyze the properties of light beams carrying phase singularities, or optical vortices. The transformations of topological charge during free-space propagation of a light wave, which is a
Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities
The authors survey the steady refinement of techniques used to create optical vortices, and explore their applications, which include sophisticated optical computing processes, novel microscopy and imaging techniques, the creation of ‘optical tweezers’ to trap particles of matter, and optical machining using light to pattern structures on the nanoscale.
Quantum sensing of photonic spin density using a single spin qubit
Photonic spin density (PSD) in the near-field gives rise to exotic phenomena such as photonic skyrmions, optical spin-momentum locking and unidirectional topological edge waves. Experimental
Tunable topological charge vortex microlaser
An OAM-tunable vortex microlaser is demonstrated, providing chiral light states of variable topological charges at a single telecommunication wavelength, providing a route for the development of the next generation of multidimensional O AM-spin-wavelength division multiplexing technology.
The universal definition of spin current
The spin current of helical edge states in HgTe/CdTe quantum wells is calculated and a generalized spin-orbit coupling term in the semiconducting media is deduced based on the theory of the electrodynamics in the moving media.
Photoelectronic mapping of the spin–orbit interaction of intense light fields
The interaction between a quantum particle’s spin angular momentum 1 and its orbital angular momentum 2 is ubiquitous in nature. In optics, the spin–orbit optical phenomenon is closely related with
Multi-photon entanglement in high dimensions
A three-photon entangled state with 3 × 3 × 2 dimensions of its orbital angular momentum is created by using two independent entangled photon pairs from two nonlinear crystals, enabling the
Spatiotemporal Optical Vortices
We present the first experimental evidence, supported by theory and simulation, of spatiotemporal optical vortices (STOVs). Quantized STOVs are a fundamental element of the nonlinear collapse and