"Hybrid mode – linearly polarized optical vortex" transformation in multihelical optical fibers

Abstract In this paper we have studied influence of attenuation on conversion processes of the fundamental mode (FM) in multihelicoidal optical fibers (MHF) in the vicinity of the point of accidental spectrum degeneracy within the framework of the scalar approximation. To this end, we have obtained expressions for modes of the MHF, which consist of the FM and an optical vortex (OV), and shown that conversion of the FM into the OV takes place. The difference in the attenuation coefficients for the partial fields of MHF’s modes leads to deterioration in the conversion process even with an ideal system’s tuning. At sufficiently large values of attenuation coefficients the conversion of the incoming FM into the vortex vanishes. Also we have shown the presence of exceptional point (EP) in the spectra of modes of the MHF and demonstrated enhanced sensitivity of the fiber in the vicinity of the EP to perturbations.

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Modal power decomposition of beam intensity profiles into linearly polarized modes of multimode optical fibers

Journal of the Optical Society of America A ◽

10.1364/josaa.21.001241 ◽

2004 ◽

Vol 21 (7) ◽

pp. 1241 ◽

Cited By ~ 25

Author(s):

Daniel Beom Soo Soh ◽

Johan Nilsson ◽

Seungin Baek ◽

Christophe Codemard ◽

Yoonchan Jeong ◽

...

Keyword(s):

Optical Fibers ◽

Beam Intensity ◽

Modal Power ◽

Linearly Polarized ◽

Linearly Polarized Modes

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SELF-TRAPPING OF OPTICAL VORTEX BY USING THE MOLECULAR REORIENTATION IN PHOTOSENSITIVE POLYMERIC MATERIALS

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s0218863512500129 ◽

2012 ◽

Vol 21 (01) ◽

pp. 1250012 ◽

Cited By ~ 1

Author(s):

RAN TAO ◽

JIANG-ZHUAN ZHU ◽

DONG SHEN ◽

XIAO-YAN GU ◽

DUAN-BIN LUO

Keyword(s):

Methyl Methacrylate ◽

Azo Dye ◽

Green Light ◽

Polymeric Materials ◽

Optical Vortex ◽

Input Power ◽

Molecular Reorientation ◽

Poly Methyl Methacrylate ◽

Self Trapping ◽

Linearly Polarized

Amorphous bulk composites were prepared by doping azo-dye Disperse Red 13 (DR13) in poly(methyl methacrylate) (PMMA) matrices. Photo-induced anisotropy of such kind of bulk polymer material was investigated experimentally by measuring the birefringence when irradiating it with linearly polarized green light. We report the first observation of self-trapping of an optical vortex based on such effect in bulk poly(methyl methacrylate) materials containing photosensitive azo-dye molecules. The dependence of the average core width of a single-charge optical vortex versus time and input power was investigated in detail.

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Asymptotic formulas for calculating the decay length of linearly polarized groups in optical fibers with step-index profile

Radiophysics and Quantum Electronics ◽

10.1007/s11141-007-0036-6 ◽

2007 ◽

Vol 50 (5) ◽

pp. 388-401

Author(s):

D. V. Kiesewetter

Keyword(s):

Optical Fibers ◽

Asymptotic Formulas ◽

Decay Length ◽

Index Profile ◽

Step Index ◽

Linearly Polarized

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Optical vortex generator with linearly polarized light illumination

Journal of Nanophotonics ◽

10.1117/1.jnp.12.016011 ◽

2018 ◽

Vol 12 (01) ◽

pp. 1 ◽

Cited By ~ 2

Author(s):

Qi Zhang ◽

Peiyu Li ◽

Yanying Li ◽

Han Wang ◽

Lixia Liu ◽

...

Keyword(s):

Polarized Light ◽

Vortex Generator ◽

Optical Vortex ◽

Light Illumination ◽

Linearly Polarized

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Optical vortices in fiber

Nanophotonics ◽

10.1515/nanoph-2013-0047 ◽

2013 ◽

Vol 2 (5-6) ◽

pp. 455-474 ◽

Cited By ~ 199

Author(s):

Siddharth Ramachandran ◽

Poul Kristensen

Keyword(s):

Angular Momentum ◽

Optical Fibers ◽

Orbital Angular Momentum ◽

Optical Vortex ◽

Optical Vortices ◽

New Class ◽

Phase Singularities ◽

Vortex Beams ◽

Exotic Beams

AbstractOptical vortex beams, possessing spatial polarization or phase singularities, have intriguing properties such as the ability to yield super-resolved spots under focussing, and the ability to carry orbital angular momentum that can impart torque to objects. In this review, we discuss the means by which optical fibers, hitherto considered unsuitable for stably supporting optical vortices, may be used to generate and propagate such exotic beams. We discuss the multitude of applications in which a new class of fibers that stably supports vortices may be used, and review recent experiments and demonstration conducted with such fibers.

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Linear to circular polarization conversion in the sharp focus of an optical vortex

Computer Optics ◽

10.18287/2412-6179-co-778 ◽

2021 ◽

Vol 45 (1) ◽

pp. 13-18

Author(s):

A.G. Nalimov ◽

S.S. Stafeev

Keyword(s):

Energy Flow ◽

Transverse Energy ◽

Optical Axis ◽

Center Of Mass ◽

Polarization Vector ◽

Optical Vortex ◽

Spin Orbital ◽

Theoretical Predictions ◽

Linearly Polarized ◽

The Right

We have shown that when sharply focusing a linearly polarized optical vortex with topological charge 2, in the near-axis region of the focal plane, not only does a reverse energy flow (the negative on-axis projection of the Poynting vector) occur, but also the right-handed circular polariza-tion of light. Moreover, due to spin-orbital angular momentum conversion, the on-axis polarization vector and the transverse energy flow rotate around the optical axis in the same direction (counter-clockwise). If an absorbing spherical microparticle is put in the focus on the optical axis, it will rotate around the axis and around its center of mass counterclockwise. Numerical simulation results confirms the theoretical predictions.

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