scholarly journals Depolarization of Light in Optical Fibers: Effects of Diffraction and Spin-Orbit Interaction

Fibers ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 34
Author(s):  
Nikolai I. Petrov
Keyword(s):  
Optical Fibers ◽  
Berry Phase ◽  
Polarization Plane ◽  
Orbit Interaction ◽  
Spin Orbit ◽  
Tensor Polarization ◽  
Spin Orbit Interaction ◽  
Graded Index ◽  
Depolarization Of Light ◽  
Light Beams

Polarization is measured very often to study the interaction of light and matter, so the description of the polarization of light beams is of both practical and fundamental interest. This review discusses the polarization properties of structured light in multimode graded-index optical fibers, with an emphasis on the recent advances in the area of spin-orbit interactions. The basic physical principles and properties of twisted light propagating in a graded index fiber are described: rotation of the polarization plane, Laguerre–Gauss vector beams with polarization-orbital angular momentum entanglement, splitting of degenerate modes due to spin-orbit interaction, depolarization of light beams, Berry phase and 2D and 3D degrees of polarizations, etc. Special attention is paid to analytical methods for solving the Maxwell equations of a three-component field using perturbation analysis and quantum mechanical approaches. Vector and tensor polarization degrees for the description of strongly focused light beams and their geometrical interpretation are also discussed.

scholarly journals Photon-phonon spin-orbit interaction in optical fibers

Optica ◽  
2021 ◽  
Author(s):  
Maxim Yavorsky ◽  
Dmitriy Vikulin ◽  
C. Alexeyev ◽  
Vladimir Belotelov
Keyword(s):  
Optical Fibers ◽  
Orbit Interaction ◽  
Spin Orbit ◽  
Spin Orbit Interaction

scholarly journals Enhanced spin orbit interaction of light in highly confining optical fibers for mode division multiplexing

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
P. Gregg ◽  
P. Kristensen ◽  
A. Rubano ◽  
S. Golowich ◽  
L. Marrucci ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Optical Fibers ◽  
High Performance ◽  
Orbit Interaction ◽  
Spin Orbit ◽  
Spin Orbit Interaction ◽  
Network Nodes ◽  
Mode Division Multiplexing ◽  
Telecommunications Network ◽  
Long Fibers

Abstract Light carries both orbital angular momentum (OAM) and spin angular momentum (SAM), related to wavefront rotation and polarization, respectively. These are usually approximately independent quantities, but they become coupled by light’s spin-orbit interaction (SOI) in certain exotic geometries and at the nanoscale. Here we reveal a manifestation of strong SOI in fibers engineered at the micro-scale and supporting the only known example of propagating light modes with non-integer mean OAM. This enables propagation of a record number (24) of states in a single optical fiber with low cross-talk (purity > 93%), even as tens-of-meters long fibers are bent, twisted or otherwise handled, as fibers are practically deployed. In addition to enabling the investigation of novel SOI effects, these light states represent the first ensemble with which mode count can be potentially arbitrarily scaled to satisfy the exponentially growing demands of high-performance data centers and supercomputers, or telecommunications network nodes.

scholarly journals Direct and reciprocal spin-orbit interaction effects in a graded-index medium

OSA Continuum ◽  
2019 ◽  
Vol 2 (5) ◽  
pp. 1576
Author(s):  
T. Pradeep Chakravarthy ◽  
Nirmal K. Viswanathan
Keyword(s):  
Interaction Effects ◽  
Orbit Interaction ◽  
Spin Orbit ◽  
Spin Orbit Interaction ◽  
Graded Index

scholarly journals Photonic spin Hall effect in metasurfaces: a brief review

Nanophotonics ◽  
2017 ◽  
Vol 6 (1) ◽  
pp. 51-70 ◽  
Author(s):  
Yachao Liu ◽  
Yougang Ke ◽  
Hailu Luo ◽  
Shuangchun Wen
Keyword(s):  
Hall Effect ◽  
Berry Phase ◽  
Polarization State ◽  
Short Review ◽  
Orbit Interaction ◽  
Spin Hall Effect ◽  
Spin Orbit ◽  
Geometric Phases ◽  
Spin Orbit Interaction ◽  
Space Variant

AbstractThe photonic spin Hall effect (SHE) originates from the interplay between the photon-spin (polarization) and the trajectory (extrinsic orbital angular momentum) of light, i.e. the spin-orbit interaction. Metasurfaces, metamaterials with a reduced dimensionality, exhibit exceptional abilities for controlling the spin-orbit interaction and thereby manipulating the photonic SHE. Spin-redirection phase and Pancharatnam-Berry phase are the manifestations of spin-orbit interaction. The former is related to the evolution of the propagation direction and the latter to the manipulation with polarization state. Two distinct forms of splitting based on these two types of geometric phases can be induced by the photonic SHE in metasurfaces: the spin-dependent splitting in position space and in momentum space. The introduction of Pacharatnam-Berry phases, through space-variant polarization manipulations with metasurfaces, enables new approaches for fabricating the spin-Hall devices. Here, we present a short review of photonic SHE in metasurfaces and outline the opportunities in spin photonics.

Spin-orbit interaction and evolution of optical eddies in perturbed weakly directing optical fibers

2002 ◽  
Vol 93 (4) ◽  
pp. 588-597 ◽  
Author(s):  
K. N. Alekseev ◽  
A. V. Volyar ◽  
T. A. Fadeeva
Keyword(s):  
Optical Fibers ◽  
Orbit Interaction ◽  
Spin Orbit ◽  
Spin Orbit Interaction

Spin generation and manipulation based on spin-orbit interaction in semiconductors

2017 ◽  
Author(s):  
J. Nitta
Keyword(s):  
Magnetic Field ◽  
Orbit Interaction ◽  
Degree Of Freedom ◽  
Effective Magnetic Field ◽  
Spin Orbit ◽  
Spin Orbit Interaction ◽  
Spin Degree ◽  
Dimensional Electron Gas ◽  
Spin Orbit Interactions ◽  
Electrical Generation

This chapter focuses on the electron spin degree of freedom in semiconductor spintronics. In particular, the electrostatic control of the spin degree of freedom is an advantageous technology over metal-based spintronics. Spin–orbit interaction (SOI), which gives rise to an effective magnetic field. The essence of SOI is that the moving electrons in an electric field feel an effective magnetic field even without any external magnetic field. Rashba spin–orbit interaction is important since the strength is controlled by the gate voltage on top of the semiconductor’s two-dimensional electron gas. By utilizing the effective magnetic field induced by the SOI, spin generation and manipulation are possible by electrostatic ways. The origin of spin-orbit interactions in semiconductors and the electrical generation and manipulation of spins by electrical means are discussed. Long spin coherence is achieved by special spin helix state where both strengths of Rashba and Dresselhaus SOI are equal.

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