Connection between electric and magnetic coherence in free electromagnetic fields

Jouttenus, T.; Setälä, Tero; Kaivola, Matti; Friberg, Ari T.

doi:10.1103/physreve.72.046611

Cited by 11 publications

(9 citation statements)

References 22 publications

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“…The huge sharp changes in the sign of the force at a given distance z/λ are clearly seen. For a statistically homogeneous source, the electric and magnetic cross-spectral density tensors fulfill [47] Figure 4 depicts the range of wavelengths where the magnetic dipole predominates over the electric one. In the near field, where the electric (magnetic) force is solely due to the evanescent modes, the weight of such force is due to the response of the nanoparticle through its proportionality to the real part of the electric (magnetic) polarizability.…”

Section: A Results For a Silicon Sphere Forces From The Primary Sourcementioning

confidence: 99%

Tailoring photonic forces on a magnetodielectric nanoparticle with a fluctuating optical source

2013

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We address the forces exerted by the random electromagnetic field emitted by a fluctuating optical source on a kind of dielectric nanoparticles that have arisen much interest because of their recently shown magnetodielectric behavior. The illumination with light, or other electromagnetic wave, of a given state of coherence allows us to create photonic forces, a particular case of which are optical analogous to the Casimir-Polder and van der Waals forces, as well as of thermal forces out of thermodynamic equilibrium. This leads to a deeper understanding of the conditions and limitations under which some theories of these forces were established. We also study the effects of the coherence length and of sharp changes in the particle differential scattering cross section due to Kerker minimum forward or zero backward conditions. We show how the nanoparticle Mie resonances, constituted by the induced electric and magnetic dipoles, lead to long distance attractions to the source, as well as to the possible predominance of magnetic forces. In addition, it is shown how, by manipulating the fluctuating source, either pushing or tractor beams are obtained, even in the far zone. These effects are specially relevant when quasimonochromatic emission is employed, and manifest the possibility of performing a monitoring of these mechanical interactions, in particular by a photonic analogy of those aforementioned classical thermal forces. This opens paths to nanoparticle ensembling and manipulation. The influence of the excitation of surface waves of the source is also considered.

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Section: A Results For a Silicon Sphere Forces From The Primary Sourcementioning

confidence: 99%

Tailoring photonic forces on a magnetodielectric nanoparticle with a fluctuating optical source

2013

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“…Quite recently a degree of electromagnetic coherence was introduced as the maximum fringe visibflity in Young's experiment with reversible optical transformations by Gori and co-workers [34]. Much research has recenfly also focused on the so-called effective (or overafl) degree of coherence of random electromagnetic fields [35,36,37], which appears to be a useful concept in many practical situations.…”

Section: Partial Coherence In Electromagnetic Fieldsmentioning

confidence: 98%

Partial Polarization and Coherence in Arbitrary Electromagnetic Fields

Friberg¹,

Wetter²,

Frejlich³

2008

AIP Conference Proceedings

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While the theories of optical coherence for scalar fields and partial polarization for beam-like waves are well developed and unambiguous, this is not so for partial coherence in random electromagnetic waves and partial polarization in fields that contain all three electric-field components. Examples of such three-dimensional vector waves are optical near fields with evanescent components and high-numerical-aperture focused electromagnetic fields. Interesting new results on arbitrary electromagnetic coherence and polarization have been obtained, for instance, in Young's two-pinhole interference setup. In this paper some recent unusual and physically unexpected results on randomly fluctuating electromagnetic fields are discussed and the current development on the basic concepts of partial polarization and partial electromagnetic coherence is reviewed.

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“…The full electromagnetic coherence matrix would also admit a CMD, as it fulfills the same criteria as the electric and magnetic coherence matrices. However, the expansion coefficients would no longer, in general, be connected to the electric and magnetic degrees of coherence via (18), but rather to a quantity measuring the coherence within and between the electric and magnetic fields. This quantity does not have an immediate understanding in terms of measurable quantities, whereas the electric and magnetic degrees of coherence possess a known physical interpretation as a measure of the intensity and polarization-state modulations in Youngʼs double slit diffraction setup [25,26].…”

Section: Cmd Of Partially Polarized Fieldsmentioning

confidence: 99%

“…In this section, we consider free electromagnetic fields, i.e., fields which consist of propagating plane waves only [18,[33][34][35]. Physically, this means that all field sources are not only outside any volume of interest (not necessarily spherical), but also very far away from it.…”

Section: Free Electromagnetic Fieldsmentioning

confidence: 99%

“…General relationships between the coherence properties of the vector electric and magnetic fields have been investigated previously [18], but the coherent modes of the random magnetic field-and especially their connection to the coherent modes of the corresponding random electric fieldappear not to have been studied so far. If the connection were simple, the coherent modes of the magnetic field would be immediately obtained from the CMD of the electric field.…”

Section: Introductionmentioning

confidence: 99%

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Coherent modes of random electric and magnetic fields in a spherical volume

Voipio¹,

Blomstedt²,

Setälä³

et al. 2014

J. Opt.

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Whereas the coherent-mode representation of scalar fields has proven valuable from both theoretical and practical points of view, the coherent modes of vector-valued optical fields have received much less attention. We demonstrate that the coherent-mode structures of a stationary, random electric field and the corresponding magnetic field in a source-free, finite, spherical volume are, in general, not equivalent, i.e., the coherent modes of the magnetic field are not obtained from those of the electric field directly via Maxwell equations and suitable normalization. We also show that the converse holds when the volume is large compared to the wavelength. Similar results are further presented for arbitrary free fields, whose sources are at infinity, and for homogeneous free fields. A homogeneous and isotropic free field in a spherical volume is then considered, and the connection between its electric and magnetic coherent-mode decompositions is derived. An example of such a field is blackbody radiation.

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Connection between electric and magnetic coherence in free electromagnetic fields

Cited by 11 publications

References 22 publications

Tailoring photonic forces on a magnetodielectric nanoparticle with a fluctuating optical source

Tailoring photonic forces on a magnetodielectric nanoparticle with a fluctuating optical source

Partial Polarization and Coherence in Arbitrary Electromagnetic Fields

Coherent modes of random electric and magnetic fields in a spherical volume

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