Comparison of three approaches to light scattering by dilute cold atomic ensembles

Sokolov, I. M.; Guerin, William

doi:10.1364/josab.36.002030

Cited by 10 publications

(4 citation statements)

References 51 publications

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“…When the light is resonant or near-resonant with an atomic transition, the light can be absorbed by the atom, with the scattered light acquiring a phase shift relative to the incident light. Close to resonance, the scattering cross section is significantly enhanced, such that multiple scattering between different atoms becomes relevant [12,13]. Moreover, single atoms can scatter only one photon at a time, giving rise to non-linear optical effects [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Bragg condition for scattering into a guided optical mode

et al. 2021

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We theoretically investigate light scattering from an array of atoms into the guided modes of a waveguide. We observe that the scattering of a plane wave laser field into the waveguide modes is dramatically enhanced for angles that deviate from the geometric Bragg angle. This modified Bragg condition arises from the dispersive interactions between the guided light and the atoms. We analytically identify various parameter regimes in which the scattering rate features a qualitatively different dependence on the atom number, such as linear, quadratic, oscillatory or constant behavior. In combination with rigorous numerical calculations, we demonstrate that these scalings are independent from a possible asymmetry of the atom-light coupling. Finally, we show that our findings are robust against voids in the atomic array, facilitating their experimental observation and potential applications. Our work sheds new light on collective light scattering and the interplay between geometry and interaction effects, with implications reaching beyond the optical domain.

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Section: Introductionmentioning

confidence: 99%

Bragg condition for scattering into a guided optical mode

et al. 2021

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“…Since cold atoms are extremely scattering near resonance, researchers tried to study the resonant multiple and dependent scattering phenomena of radiation in them, due to the advantages of cold atomic systems over conventional micro/nanoscale scattering media including well-controlled systems and widely tunable parameters [188,439]. Remarkably, for dilute cold atomic clouds, radiative transfer equation is also widely applied to the description of multiple scattering of photons [439,440]. Moreover, the prominent collective effects like subradiance and superradiance due to the multiple wave scattering and interferences are also of fundamental importance [441].…”

Section: Dependent Scattering and Other Related Interference Phenomen...mentioning

confidence: 99%

The dependent scattering effect on radiative properties of micro/nanoscale discrete disordered media

Wang,

Zhao

2020

Preprint

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The dependent scattering effect (DSE), which arises from the wave nature of electromagnetic radiation, is a critical mechanism affecting the radiative properties of micro/nanoscale discrete disordered media (DDM). In the last a few decades, the approximate nature of radiative transfer equation (RTE) leads to a plethora of investigations of the DSE in various DDM, ranging from fluidized beds, photonic glass, colloidal suspensions and snow packs, etc. In this article, we give a general overview on the theoretical, numerical and experimental methods and progresses in the study of the DSE. We first present a summary of the multiple scattering theory of electromagnetic waves, including the analytic wave theory and Foldy-Lax equations, as well as its relationship with the RTE. Then we describe in detail the physical mechanisms that are critical to DSE and relevant theoretical considerations as well as numerical modeling methods. Experimental approaches to probe the radiative properties and relevant progresses in the experimental investigations of the DSE are also discussed. In addition, we give a brief review on the studies on the DSE and other relevant interference phenomena in mesoscopic physics and atomic physics, especially the coherent backscattering cone, Anderson localization, as well as the statistics and correlations in disordered media. We expect this review can provide profound and interdisciplinary insights to the understanding and manipulation of the DSE in disordered media for thermal engineering applications.

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“…They lead, for instance, to modifications of the scattering properties such as line shifts and broadening [1] in 1D [2] and 2D systems [3], sub- [4] and super-radiance [5], the optical phase profile engineering [6] to control the reflection properties [7] of a single atomic layer or the localization of light in different regimes [8,9]. Simulations of the coupled dipole equations in the linear-optics regime include interference effects such as coherent backscattering [10,11]which was also predicted using random walk simulations including the atomic internal structure complexity [12,13].…”

Section: Introductionmentioning

confidence: 99%

Effective two-level approximation of a multi-level system driven by coherent and incoherent fields

Veyron,

Mancois,

Gerent

et al. 2021

Preprint

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The numerical simulation of multiple scattering in dense ensembles is the mostly adopted solution to predict their complex optical response. While the scalar and vectorial light mediated interactions are accurately taken into account, the computational complexity still limits current simulations to the low saturation regime and ignores the internal structure of atoms. Here, we propose to go beyond these restrictions, at constant computational cost, by describing a multi-level system (MLS) by an effective two-level system (TLS) that best reproduces the coherent and total scattering properties in any saturation regime. The correspondence of our model is evaluated for different experimentally realistic conditions such as the modification of the driving field polarization, the presence of stray magnetic fields or an incoherent resonant electromagnetic field background. The trust interval of the model is quantified for the D2-line of 87 Rb atoms but it could be generalized to any closed transition of a multi-level quantum system.

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Comparison of three approaches to light scattering by dilute cold atomic ensembles

Cited by 10 publications

References 51 publications

Bragg condition for scattering into a guided optical mode

Bragg condition for scattering into a guided optical mode

The dependent scattering effect on radiative properties of micro/nanoscale discrete disordered media

Effective two-level approximation of a multi-level system driven by coherent and incoherent fields

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