Coherent backscattering of light in a magnetic field

Lacoste, David; Tiggelen, B. A. van

doi:10.1103/physreve.61.4556

Cited by 26 publications

(16 citation statements)

References 20 publications

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“…So far, we have neglected all propagation effects. However, note that the Faraday rotation due to the propagation of the light through the "skin layer" separating the sample surface from the first scattering event [5] would have the same influence on the cone shape as the dipole rotation ϕ. As it will be discussed later, our results indicate that the dipole rotation dominates in this experiment.…”

Section: For Resonant Light (Laser Detuningsupporting

confidence: 55%

“…It was predicted [2], then experimentally observed [3] and theoretically studied [4,5] that it results in a decrease of the CBS enhancement as well as some rather complicated behavior of the cone shape. In our current understanding of CBS, two ingredients are essential : the individual scattering event, characterized for example by the radiation pattern of each scatterer (this is the single scattering ingredient), and the propagation in the medium between scattering events (this is the "average effective medium" ingredient).…”

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confidence: 99%

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Hanle Effect in Coherent Backscattering

et al. 2002

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We study the shape of the coherent backscattering (CBS) cone obtained when resonant light illuminates a thick cloud of laser-cooled rubidium atoms in presence of a homogenous magnetic field. We observe new magnetic field-dependent anisotropies in the CBS signal. We show that the observed behavior is due to the modification of the atomic radiation pattern by the magnetic field (Hanle effect in the excited state). 32.80.Pj When a multiply scattering medium is illuminated by a laser beam, the scattered intensity results from the interference between the amplitudes associated with the various scattering paths; for a disordered medium, the interference terms are washed out when averaged over many sample configurations, except in a narrow angular range around exact backscattering where the average intensity is enhanced. This phenomenon, known as coherent backscattering (CBS), is due to a two-wave constructive interference (at exact back-scattering) between waves following a given scattering path and the associated reverse path, where exactly the same scatterers are visited in the reversed order [1]. The maximum enhancement is obtained when the amplitudes of the interfering paths are exactly balanced. For a convenient choice of polarization, time-reversal symmetry directly implies the equality of the interfering amplitudes. More generally, the interference phenomenon is very robust and qualitatively insensitive to most characteristics of the sample and illuminating wave.However, applying a magnetic field on the sample breaks the time-reversal invariance. It was predicted [2], then experimentally observed [3] and theoretically studied [4,5] that it results in a decrease of the CBS enhancement as well as some rather complicated behavior of the cone shape. In our current understanding of CBS, two ingredients are essential : the individual scattering event, characterized for example by the radiation pattern of each scatterer (this is the single scattering ingredient), and the propagation in the medium between scattering events (this is the "average effective medium" ingredient). Of course, these two ingredients are not independent since the optical theorem links the propagation in the medium to the individual scattering. In the presence of a magnetic field, both ingredients can be affected. For the propagation, this is well known under the name of Faraday effect (and the Voigt or Cotton-Mouton effect) and can be described by the modification of the complex refractive index by the magnetic field. The magnetic field-induced variation of the radiation pattern is much less studied, because it is very small in usual magnetooptically active materials; it is responsible for the "photonic Hall effect" predicted by van Tiggelen [6] and later observed experimentally [7]. In this paper, we show a novel situation where it is experimentally and theoretically possible to discriminate between the two ingredients and where the modification of the radiation pattern dominates the propagation effects.In our experiment, we analyze coheren...

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Section: For Resonant Light (Laser Detuningsupporting

confidence: 55%

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confidence: 99%

Hanle Effect in Coherent Backscattering

et al. 2002

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“…Several groups are working on single and multiple scattering by magnetic scatterers in non-magnetic medium [17][18][19]. Our recent studies have shown some unusual light transport in ferrocolloids in presence of external magnetic field [20]. This study reflects effect of magnetic field Mie resonance by magnetic spheres dispersed in magnetic nanofluids and its impact on light transport in magnetic colloids.…”

Section: Introductionmentioning

confidence: 99%

Magnetic field dependent resonant light scattering by magnetic spheres in a magnetizable medium

Bhatt¹

2016

Nanosystems: Phys. Chem. Math.

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The anisotropy factor is a parameter from which one can determine preferential forward and backward light scattering. In the present study, we have calculated anisotropy factor cos θ as a function of magnetic field for magnetic spheres in a magnetic medium. We have noticed resonances in cos θ which indicate preferential enhanced scattering in forward and backward directions. Anisotropy factor is analyzed for various size parameters. The study clearly indicates that scattering can be modulated by means of size parameter of magnetic spheres as well as magnetic field. We have further confirmed the result by studying forward and backward intensity as a function of magnetic field. Resonances noticed in the intensity are in good agreement with the previous argument. This observation can be useful for the magnetic field dependent directional scattering and novel magneto-photonic devices.

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“…[11][12][13][14] When both the scatterers as well as the medium are magnetizable, the system manifests several intriguing possibilities. When scatterers are magnetic or the surrounding medium is magnetically active, they exhibit new photonic effects.…”

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confidence: 99%

“…[ 13,16 ] Commercially available magnetite powder was fi rst washed with dilute nitric acid to remove impurities. [ 13,16 ] Commercially available magnetite powder was fi rst washed with dilute nitric acid to remove impurities.…”

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Experimental Demonstration of Magnetic Carriage for Transport of Light Trapped in Magnetizable Mie Spheres

Patel

Mehta

2013

Advanced Optical Materials

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Demonstration of transport of trapped light: the refractive index contrast between a colloidal dispersion of micrometer‐sized particles and the surrounding ferrofluid is a function of the applied static magnetic field. This can be used to tune the morphology‐dependent resonance in the microspheres, leading to light trapping. The trapped light can then be transported magnetically via the ferrodispersion and released by turning off the applied field.

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Coherent backscattering of light in a magnetic field

Cited by 26 publications

References 20 publications

Hanle Effect in Coherent Backscattering

Hanle Effect in Coherent Backscattering

Magnetic field dependent resonant light scattering by magnetic spheres in a magnetizable medium

Experimental Demonstration of Magnetic Carriage for Transport of Light Trapped in Magnetizable Mie Spheres

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