Light scattering by coated spheres: Experimental results and numerical simulations

Lasue, J.; Levasseur-Regourd, A. C.; Hadamcik, Edith; Renard, J. B.

doi:10.1016/j.jqsrt.2007.01.037

Cited by 12 publications

(2 citation statements)

References 21 publications

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“…To see this, we first note that a 45 nm ice coating is too thin to have a substantial effect on the albedo, as shown by both models and measurements of non-absorbing coatings on grains (e.g. Lasue et al 2007). As a result, the temperature of the ice film would be set by the temperature of the grain material with which it sits in close physical contact.…”

Section: Figure (mentioning

confidence: 99%

Limits to Ice on Asteroids (24) Themis and (65) Cybele

Jewitt¹,

Guilbert-Lepoutre

2011

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We present optical spectra of (24) Themis and (65) Cybele, two large mainbelt asteroids on which exposed water ice has recently been reported. No emission lines, expected from resonance fluorescence in gas sublimated from the ice, were detected. Derived limits to the production rates of water are 400 kg s −1 (5σ), for each object, assuming a cometary H 2 O/CN ratio. We rule out models in which a large fraction of the surface is occupied by high albedo ("fresh") water ice because the measured albedos of Themis and Cybele are low (∼0.05 -0.07). We also rule out models in which a large fraction of the surface is occupied by low albedo ("dirty") water ice because dirty ice would be warm, and would sublimate strongly enough for gaseous products to have been detected. If ice exists on these bodies it must be relatively clean (albedo 0.3) and confined to a fraction of the Earth-facing surface 10%. By analogy with impacted asteroid (596) Scheila, we propose an impact excavation scenario, in which 10 m scale projectiles have exposed buried ice. If the ice is even more reflective (albedo 0.6) then the timescale for sublimation of an optically thick layer can rival the ∼10 3 yr interval between impacts with bodies this size. In this sense, exposure by impact may be a quasi steady-state feature of ice-containing asteroids at 3 AU.

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Section: Figure (mentioning

confidence: 99%

Limits to Ice on Asteroids (24) Themis and (65) Cybele

Jewitt¹,

Guilbert-Lepoutre

2011

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“…A particular case of coated sphere is a hollow sphere for which

n_{b} = 1

. Light scattering by coated and hollow spheres has been extensively studied both theoretically and experimentally . Synthesis of monodisperse sub‐μm hollow TiO 2 spheres for potential use in photonic applications was demonstrated by Eiden‐Assmann et al .…”

Section: Hollow and Coated Spheresmentioning

confidence: 99%

Longitudinal Optical Fields in Light Scattering from Dielectric Spheres and Anderson Localization of Light

Escalante

Skipetrov

2017

Annalen der Physik

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Recent research has shown that coupling between point scatterers in a disordered medium by longitudinal electromagnetic fields is harmful for Anderson localization of light. However, it has been unclear if this feature is generic or specific for point scatterers. The present work demonstrates that the intensity of longitudinal field outside a spherical dielectric scatterer illuminated by monochromatic light exhibits a complicated, nonmonotonous dependence on the scatterer size. Moreover, the intensity is reduced for a hollow sphere, whereas one can adjust the parameters of a coated sphere to obtain a relatively low longitudinal field together with a strong resonant scattering efficiency. Therefore, random arrangements of structured (hollow or coated) spheres may be promising three-dimensional disordered materials for reaching Anderson localization of light.

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