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Light scattering

About: Light scattering is a research topic. Over the lifetime, 37721 publications have been published within this topic receiving 861581 citations.


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TL;DR: In this paper, the authors review the development and experimental aspects of the scanning flow cytometry (SFC) and provide the measurement of fluorescence and light scattering of individual particles with a typical rate up to 500 particles/s.
Abstract: With this work we review the development of theoretical and experimental aspects of the scanning flow cytometry (SFC). The optical and hydrodynamic systems of the SFC provide the measurement of fluorescence and light scattering of individual particles with a typical rate up to 500 particles/s. In addition the optical system of the SFC has the capability of individual particle analysis beyond that of an ordinary flow cytometry. The SFC measures an entire angular dependency of light scattering intensity (flying light scattering indicatrix, FLSI) over angles ranging from 5° to 120°. The fluorescence collection efficiency of the SFC approaches 1/3 of a sphere. Moreover, the optical system of the SFC provides the measurement of fluorescence in a time-resolved mode on a microsecond time scale. The processing of the output data in light scattering is based on a parametric solution of the inverse light-scattering problem, the FLSI method. The FLSI method allows the determination of size and refractive index of spherically modeled particles over a range of diameters from 0.9 to 15 μm and a range of refractive indexes from 1.37 to 1.60. The performance of the SFC in different applications has been demonstrated.

153 citations

Journal ArticleDOI
TL;DR: In this article, the authors employed accurate vector and scalar multiple-scattering calculations to perform a systematic study of the errors induced by the neglect of polarization in radiance calculations for a homogeneous, plane-parallel Rayleigh scattering atmosphere above a Lambertian surface.
Abstract: Although neglecting polarization and replacing the rigorous vector radiative transfer equation by its approximate scalar counterpart has no physical background, it is a widely used simplification when the incident light is unpolarized and only the intensity of the reflected light is to be computed. We employ accurate vector and scalar multiple-scattering calculations to perform a systematic study of the errors induced by the neglect of polarization in radiance calculations for a homogeneous, plane-parallel Rayleigh-scattering atmosphere (with and without depolarization) above a Lambertian surface. Specifically, we calculate percent errors in the reflected intensity for various directions of light incidence and reflection, optical thicknesses of the atmosphere, single-scattering albedos, depolarization factors, and surface albedos. The numerical data displayed can be used to decide whether or not the scalar approximation may be employed depending on the parameters of the problem. We show that the errors decrease with increasing depolarization factor and/or increasing surface albedo. For conservative or nearly conservative scattering and small surface albedos, the errors are maximum at optical thicknesses of about 1. The calculated errors may be too large for some practical applications, and, therefore, rigorous vector calculations should be employed whenever possible. However, if approximate scalar calculations are used, we recommend to avoid geometries involving phase angles equal or close to 0 deg and 90 deg, where the errors are especially significant. We propose a theoretical explanation of the large vector/scalar differences in the case of Rayleigh scattering. According to this explanation, the differences are caused by the particular structure of the Rayleigh scattering matrix and come from lower-order (except first-order) light scattering paths involving right scattering angles and right-angle rotations of the scattering plane.

153 citations

Journal ArticleDOI
TL;DR: In this paper, a detailed experimental and numerical study of random lasing in weakly scattering systems is presented, where the interference of scattered light, which is weak in the passive systems, is greatly enhanced in the presence of high gain, providing coherent and resonant feedback for lasing.
Abstract: We present detailed experimental and numerical studies of random lasing in weakly scattering systems. The interference of scattered light, which is weak in the passive systems, is greatly enhanced in the presence of high gain, providing coherent and resonant feedback for lasing. The lasing modes are confined in the vicinity of the pumped volume due to absorption of emitted light outside it. In the ballistic regime where the size of the gain volume is less than the scattering mean free path, lasing oscillation occurs along the direction in which the gain volume is most extended, producing directional laser output. The feedback for lasing originates mainly from backscattering of particles near the boundaries of the pumped region. It results in nearly constant frequency spacing of lasing modes, which scales inversely with the maximum dimension of the gain volume.

153 citations

Journal ArticleDOI
TL;DR: In this paper, the axial point spread function of optical coherence tomography for Gaussian intensity profiles emitted from and coupled back into singlemode fibers for signals from a scattering medium was determined.
Abstract: The authors studied the axial point spread function of optical coherence tomography for Gaussian intensity profiles emitted from and coupled back into single-mode fibers for signals from a scattering medium. The determined Rayleigh length of the axial point spread function was roughly twice the one measured from the reflection of a mirror. Using the measured point spread function in combination with the single backscatter model allowed determination of the attenuation coefficient of the suspension.

153 citations

Journal Article
TL;DR: The scattering factor shows a marked increase in patients with early cataracts even if their visual acuity is not affected, and is a direct measure of the intraocular light scattering.
Abstract: A method is presented for quantitative measurements of the glare effect of light scattered in the ocular media The contrast sensitivity function is measured with a television display system A bright light source is introduced into the field of vision, and the resultant decrease in contrast sensitivity is mea-ured It is further used to calculate a scattering factor which is a direct measure of the intraocular light scattering The scattering factor shows a marked increase in patients with early cataracts even if their visual acuity is not affected

153 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023235
2022537
2021485
2020680
2019751
2018799