Coherent and incoherent additions of light beams at solutions of the light scattering problem by use the beam tracing method within the framework of physical optics

The physical optics approximation was used to solve the light scattering problem of large dust particles with irregular shape. The comparison between the physical optics approximation and the DDA method was made for particles with volume-equivalent size parameters of 44.21. A full light scattering matrix (Mueller matrix) was calculated for particles with volume-equivalent size parameters from 44 up to 220 for two wavelengths: 0.532 and 1.064 μm. The dependences of the lidar and depolarization ratio, and extinction coefficient on the number of spatial orientations of the particle were obtained. It was shown that the elements of the light backscattering matrix obey power laws.

Download Full-text

Light Backscattering by Ice Crystals of Cirrus Clouds Within the Physical Optics Approximation

EPJ Web of Conferences ◽

10.1051/epjconf/202023708011 ◽

2020 ◽

Vol 237 ◽

pp. 08011

Author(s):

Alexander Konoshonkin ◽

Anatoli Borovoi ◽

Natalia Kustova ◽

Zhenzhu Wang ◽

Dong Liu ◽

...

Keyword(s):

Light Scattering ◽

Spatial Orientation ◽

Scattering Problem ◽

Cirrus Clouds ◽

Ice Crystals ◽

Physical Optics ◽

Nonspherical Particles ◽

Physical Optics Approximation ◽

Computer Resources

Lidar technologies are widely used for retrieving microphysics of cirrus clouds, i.e. sizes, shapes and spatial orientation of ice crystals constituting the clouds. Interpretation of the lidar signals are based on the backscattered light. However, properties of the light backscattered by the ice crystals have not been well known and understood yet. The reason of this is that the problem of light scattering by the ice crystals much larger that incident wavelengths has not been solved satisfactorily yet because of great demands to computer resources. In this contribution we review the physical optics approximation as a prospective method to solve the light scattering problem on large nonspherical particles in lidar application.

Download Full-text

Study of the convergence of the numerical solution of the light scattering problem by atmospheric ice crystals within the physical optics method

10.1117/12.2605029 ◽

2021 ◽

Author(s):

Alexander V. Konoshonkin ◽

Ilia V. Tkachev ◽

Victor A. Shishko ◽

Dmitrii N. Timofeev ◽

Natalia V. Kustova

Keyword(s):

Light Scattering ◽

Numerical Solution ◽

Scattering Problem ◽

Ice Crystals ◽

Physical Optics

Download Full-text

Hybrid Physical Optics-Ray Tracing Method for the RCS Calculation of Electrically Large Objects Covered with Radar Absorbing Materials

12th European Conference on Antennas and Propagation (EuCAP 2018) ◽

10.1049/cp.2018.0556 ◽

2018 ◽

Author(s):

P. Usai ◽

M. Borgese ◽

F. Costa ◽

A. Monorchio

Keyword(s):

Ray Tracing ◽

Physical Optics ◽

Ray Tracing Method ◽

Absorbing Materials ◽

Tracing Method

Download Full-text

Application of the Solution of the Inverse Light Scattering Problem for Characterization of Mononuclear Cells

Siberian Journal of Physics ◽

10.54362/1818-7919-2009-4-2-61-68 ◽

2009 ◽

Vol 4 (2) ◽

pp. 61-68

Author(s):

Dmitriy Strokotov ◽

Yuriy Pichugin ◽

Maxim Yurkin ◽

Mariya Gridina ◽

Oleg Serov ◽

...

Keyword(s):

Stem Cells ◽

Light Scattering ◽

Mononuclear Cells ◽

Human Lymphocytes ◽

Scattering Problem ◽

Refractive Indices ◽

Single Particles ◽

Differentiation Status

In this manuscript we propose two methods to solve inverse light scattering problem for single particles, which can be described as a coated sphere. The efficiency of the methods is illustrated by characterization of lymphocytes and stem cells using light scattering patterns obtained with scanning flow cytometer. Both methods, spectral and global optimization, were used to obtain diameters and refractive indices of the cytoplasm and the nucleus of mice embryo stem cells and human lymphocytes. These results agree with data obtained from other studies. Determination of these parameters is important for diagnostics of pathological states of lymphocytes and differentiation status of embryo stem cells. Moreover, methods described in this manuscript are applicable to all mononuclear cells. We also considered limitations of these methods and their possible improvements.

Download Full-text