Optical helicity of unpolarized light

Forbes, Kayn A.

doi:10.1103/physreva.105.023524

Cited by 31 publications

(31 citation statements)

References 43 publications

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“…Recent advances in the areas of nanophotonics and near-field optics stipulate growing interest to the polarimetric structure of 3D light fields [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50]. An interesting fact is that any state of polarization of the 3D fields can be represented in terms of regular and irregular components [34][35][36].…”

Section: Non-paraxial Fields and Genuine 3d Polarization Statesmentioning

confidence: 99%

“…Accordingly, 3D-structured light beams that are generated by a 2D source may also carry a sort of the azimuthal phase factor, i.e., acquire a nonzero contribution to the optical helicity density [45,46], which does not depend on the state of polarization and can therefore originate from an unpolarized 2D light source. As a consequence, light generated by a completely unpolarized paraxial OV source can exhibit optical activity [46].…”

Section: Non-paraxial Fields and Genuine 3d Polarization Statesmentioning

confidence: 99%

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Correlation Optics, Coherence and Optical Singularities: Basic Concepts and Practical Applications

et al. 2022

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The main idea of this review is to trace the interrelations and inter-transitions between the basic concepts and approaches of the correlation optics (including the light coherence) and the singular optics dealing with networks of “exceptional” points of light fields. The principles and examples are described of formation of light fields with required structures (amplitude, phase and polarization distributions, spectral properties as well as the internal energy flows and energy gradients responsible for optical forces) via superpositions of model optical fields of simple standard configurations and under controllable correlation conditions. The theoretical and experimental results, obtained by the authors and other researchers, demonstrate possibilities of the general approach to the complex fields formation with spatial and polarization inhomogeneities. A special topic, considered in more detail, is the interaction of structured optical fields with the media containing suspended micro- and nanoparticles, their inhomogeneous heating by the laser radiation and the accompanying self-diffraction and self-focusing phenomena. Possible light-induced phase transitions and controllable generation of the gas-vapor microbubbles in the medium are discussed. Specific optical singularities in polychromatic light fields are analyzed in connection to the field coherence. Some experimental solutions for revealing the fine structure of optical fields by means of the interference schemes are presented. Practical applications for the micromanipulation techniques, optical diagnostics of remote and random objects, optical treatment and laboratory practice in biology and medicine are described and discussed.

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Section: Non-paraxial Fields and Genuine 3d Polarization Statesmentioning

confidence: 99%

Section: Non-paraxial Fields and Genuine 3d Polarization Statesmentioning

confidence: 99%

Correlation Optics, Coherence and Optical Singularities: Basic Concepts and Practical Applications

et al. 2022

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“…For linearly polarized and unpolarized plane waves there is no possibility for enantioselective gradient forces because 0  = and thus their optical helicity 0 h = . In comparison, 3D structured LG modes are known to possess a non-zero optical helicity density contribution for 2D linear polarizations 34,39 and it has recently been shown that remarkably this contribution is in fact independent of 2D polarization, being non-zero for even unpolarized input light 40 . The rotationally averaged gradient trapping potential energy with an 2D unpolarized 3D…”

Section: D Polarized Independent Enantioselective Forcementioning

confidence: 99%

Optical tweezing chiral particles with 3D structured light

Forbes

Green

2022

Nanophotonics IX

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In this work we highlight enantioselective optical gradient forces acting on Rayleigh-seized chiral particles present in 3D structured (non-paraxial) optical vortex tweezing systems. One discriminatory force originates from the circular polarization of the light and is similar to previous chiral optical gradient trapping forces. Much more remarkable is the other which is independent of the input beam's polarization state -even occurring for unpolarized lightand is not present in 2D structured light nor propagating plane waves. This latter chiral sorting mechanism allows for the enantioselective trapping of chiral particles into distinct rings in the transverse plane through conservative radial forces.

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“…Not all of these quantities have a clear physical meaning. Among the meaningful ones, the helicity H = H[h], the chirality C = C[χ] and the spin angular momentum S = S[s] are particularly significant for the study of optical fields [7,8,9,10,11,12,13]. The corresponding densities h = h(r, t), χ = χ(r, t) and s = s(r, t), are given by h = 1 2…”

Section: Introductionmentioning

confidence: 99%

A note on helicity, chirality and spin of optical fields

Aiello

2022

Preprint

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Helicity H, chirality C and spin angular momentum S are three physical observables that play an important role in the study of optical fields. These quantities are closely related, but their connection is hidden by the use of four different vector fields for their representation, namely the electric and magnetic fields E and B, and the two transverse potential vectors C ⊥ and A ⊥ . Helmholtz's decomposition theorem restricted to solenoidal vector fields, entails the introduction of a bona fide inverse curl operator, which permits to express the above three quantities in terms of the electric and magnetic fields only. This gives clear expressions for H, C and S, which are automatically gauge-invariant and show electric-magnetic democracy.

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Optical helicity of unpolarized light

Cited by 31 publications

References 43 publications

Correlation Optics, Coherence and Optical Singularities: Basic Concepts and Practical Applications

Correlation Optics, Coherence and Optical Singularities: Basic Concepts and Practical Applications

Optical tweezing chiral particles with 3D structured light

A note on helicity, chirality and spin of optical fields

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