Effects of Interaction of Electromagnetic Waves in Complex Particles

Kolokolova, L.; Петрова, Е. В.; Kimura, Hiroshi

doi:10.5772/16456

Cited by 12 publications

(11 citation statements)

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“…The search for chiral signatures in meteorites remains an active area of research (Avnir, 2021;Glavin et al, 2020b, a) and is a candidate technique to detect biosignatures in future probes to Enceladus (MacKenzie et al, 2021;Neveu et al, 2020). Remote sensing of CP has been proposed as a technique for detection in comets and planets (Kolokolova et al, 2011). Measurements of CP from comets using spectropolarimeters have also been reported and chiral particles were suggested as a possible source of the observed CP (Rosenbush et al, 2007).…”

Section: An Overlooked Source Of Circular Polarization: Chiral Aerosolsmentioning

confidence: 99%

Circular polarization in atmospheric aerosols

Gassó

Knobelspiesse²

2022

Atmos. Chem. Phys.

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Abstract. Recent technological advances have demonstrated the feasibility of deploying spaceborne optical detectors with full polarimetric capabilities. The measurement of all four Stokes coefficients opens significant new opportunities for atmospheric aerosol studies and applications. While considerable amounts of attention have been dedicated to sensors with sensitivity to the total intensity and linear polarization (represented by Stokes coefficients I, U, Q), there has been less attention to the additional information brought by measuring circular polarization (coefficient V). This report fills this gap in knowledge by providing an overview of aerosol sources of circular polarization in the atmosphere and discusses possible remote sensing signatures. In this paper, circularly polarized radiation that results from the interaction of incident unpolarized radiation is considered in three physical settings: optical activity originating in biogenic aerosols, alignment of non-spherical particles in the presence of electrical fields (such as dust, smoke, and volcanic ash), and aerosol multiple scattering effects. Observational and theoretical evidence of, and the settings and conditions for, non-zero aerosol circular polarization generated from incident unpolarized radiation are here gathered and discussed. In addition, novel radiative transfer simulations are shown to illustrate notable spectral and other features where circular polarization may provide additional information that is possibly independent from total intensity and linear polarization-only observations. Current techniques for the detection of aerosol composition (also referred as aerosol type) from space provide limited information. Remote identification of aerosols such as smoke, volcanic ash, and dust particles can only be accomplished with some degree of confidence for moderate to high concentrations. When the same aerosols are found at lower concentrations (but still high enough to be of importance for air quality and cloud formation), these methods often produce ambiguous results. The circular polarization of aerosols is rarely utilized, and we explore its value for improved determination aerosol composition. This study is presented as an overview with a goal to provide a new perspective on an overlooked optical property and to trigger interest in further exploration of this subject.

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Section: An Overlooked Source Of Circular Polarization: Chiral Aerosolsmentioning

confidence: 99%

Circular polarization in atmospheric aerosols

Gassó

Knobelspiesse²

2022

Atmos. Chem. Phys.

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“…Large dust particles in the geometrical optics regime (a > a few tens of µm) can be further considered with two different porosities: fluffy (porous) and compact particles, two of which are in fact two main populations of dust particles of comet 67P/Churyumov-Gerasimenko (67P) collected by Rosetta/GIADA (Fulle et al 2015). In case of large fluffy particles (tensile strength of <10 5 N m −2 (Mendis 1991) and high charge-to-mass ratio (Fulle et al 2015)), they behave similarly to that of the individual constituent particles in dynamics (Mukai et al 1992), in light scattering (Kolokolova 2011), and in thermal emissions (Wooden 2002;Kolokolova et al 2007). Accordingly, the polarimetric properties of scattered light by such large fluffy dust particles would be akin to those by particles approaching the Rayleigh regime (but are larger than X = 1) (i.e., an increase in P r with the red PC), which again contradicts the observed results of 252P.…”

Section: Change In Particle Size and Porositymentioning

confidence: 99%

Near-infrared polarimetric study of near-Earth object 252P/LINEAR: an implication of scattered light from the evolved dust particles

Kwon¹,

Ishiguro²,

Kwon

et al. 2019

A&A

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Context. Comets have been resurfacing under solar radiation while preserving their primordial interiors. Multi-epoch observations of comets enable us to characterize a change in sublimation pattern as a function of heliocentric distance, which in turn provides information on the dust environment of comets. Aims. We aim to constrain the size and porosity of ejected dust particles from comet 252P/LINEAR and their evolution near the perihelion via near-infrared (NIR) multiband polarimetry. A close approach of the comet to the Earth in March 2016 (∼0.036 au) provided a rare opportunity for the sampling of the comet with a high spatial resolution. Methods. We made NIR JHK S bands (1.25-2.25 µm) polarimetric observations of the comet for 12 days near perihelion, interspersed between broadband optical (0.48-0.80 µm) imaging observations over four months. In addition, dynamical simulation of the comet was performed 1000 yr backward in time.Results. We detected two discontinuous brightness enhancements of 252P/LINEAR. Before the first enhancement, the NIR polarization degrees of the comet were far lower than those of ordinary comets at a given phase angle. Soon after the activation, however, they increased by ∼13 % at most, showing unusual blue polarimetric color over the J and H bands (−2.55 % µm −1 on average) and bluing of both J − H and H − K S dust color. Throughout the event, the polarization vector was marginally aligned perpendicular to the scattering plane (i.e., θ r = 4.6 • -10.9 • ). The subsequent postperihelion reactivation of the comet lasted for approximately 1.5 months, with a factor of ∼30 times pre-activation dust mass-loss rates in the R C band. Conclusions. The marked increase in the polarization degree with blue NIR polarimetric color is reminiscent of the behaviors of a fragmenting comet D/1999 S4 (LINEAR). The most plausible scenario for the observed polarimetric properties of 252P/LINEAR would be an ejection of predominantly large (well in geometrical optics regime), compact dust particles from the desiccated surface layer. We conjecture that the more intense solar heating that the comet has received in the near-Earth orbit would cause the paucity of small, fluffy dust particles around the nucleus of the comet.

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“…Впервые явление «отрицатель-ной» линейной поляризации, смещенной в область малых фазовых углов, было обнаружено Берна-ром Лио при поляриметрическом наблюдении по-верхности Луны в 1922 г. [23] [24][25][26]. Было установлено, что вли-яние объема вещества слоя сказывается на поло-жительной ветви ПФК в виде подавления значе-ний степени поляризации в максимуме и в сме-щении максимума влево от положений под углом Брюстера.…”

Section: принцип многоугловой стокс-видеополяриметрииunclassified