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PAP315 Computational light scattering, 5 cr 
Code PAP315  Validity 01.01.2017 -
Name Computational light scattering  Abbreviation Computational l 
Scope5 cr   
TypeAdvanced studies
TypeCourse   
  GradingGeneral scale 
  no
    Can be taken more than onceno
Unit Master's Programme in Particle Physics and Astrophysical Sciences 

Description
Target group 

Master’s Programme in Particle Physics and Astrophysical Sciences is responsible for the course.

Module where the course belongs to:

  • PAP300 Advanced Studies in Particle Physics and Astrophysical Sciences
    Optional for:
    1. Study Track in Astrophysical Sciences

The course is available to students from other degree programmes.

 
Timing 

After the theoretical astrophysics package in the B.Sc. programme for physical sciences.

The course is offered in the autumn in period I every other year.

 
Learning outcomes 

The course Electromagnetic Scattering I offers an introduction and theoretical foundation for elastic electromagnetic scattering by arbitrary objects (usually called particles). As compared to the wavelength, the sizes of the objects can be small or large, or of the order of the wavelength.  As to the shape of the objects, main emphasis is on spherical particles and, subsequently, on the so-called Mie scattering. The optical properties of the objects are typically described by the refractive index.

 
Completion methods 

The course can also be taken individually with flexible timing after a discussion and planning session with the lecturers.

 
Prerequisites 

Theoretical astrophysics package in the B.Sc. programme for physical sciences. Theoretical physics package including electrodynamics in the B.Sc. programme for physical sciences.

 
Recommended optional studies 

Electromagnetic Scattering II

 
Contents 

The scattering course starts by a review of classical electromagnetics introducing the Maxwell equations, the energy and impulse of electromagnetic fields, and Poynting's theorem. The wave equations are derived from the Maxwell equations and electromagnetic plane waves are discussed.

The fundamentals of electromagnetism are followed by the necessary framework for classical scattering theory, defining the incident, internal, and scattered fields and the scattering plane as well as the scattering angle. The Stokes parameters and Mueller matrices are introduced.  Thereafter, the 2 x 2 amplitude scattering matrix and the 4 x 4 scattering matrix are described.

The Fresnel reflection and refraction of electromagnetic plane waves on a plane interface are discussed as the first electromagnetic scattering problem, utilizing 4 x 4 Mueller matrices for reflection and refraction.

A treatment on scattering at long wavelengths follows, introducing the electric and magnetic multipoles and Rayleigh scattering, in particular. Particle shape is next taken into account in what is called the Rayleigh-Gans approximation. The scattering problem is presented in the volume-integral-equation formalism.

The rigorous treatment on electromagnetic scattering by spherical particles (Mie scattering) follows thereafter using multipole expansions. This involves the development of mathematical methods utilizing vector spherical harmonics.

After Mie scattering, scattering at short wavelengths follows, relying partly on the reflection and refraction treatments in the early parts of the course. Main emphasis is however in diffraction of waves by obstacles, shedding light on Fraunhofer and Fresnel diffraction as well as on Kirchhoff integral relations between fields near the obstacles and the far fields.

Towards the end of the course, the student will learn basics of computational methods for scattering by nonspherical particles, such as the discrete-dipole approximation and the T-matrix method.

During the course, students prepare and present short oral contributions on topics of relevance for light scattering. Additionally, each student acts as an opponent for another student.

 
Study materials and literature 

Set reading:

K. Muinonen, Electromagnetic Scattering I, Lecture Notes, 2012 (latest draft)

C. F. Bohren & D. R. Huffman, Absorption and Scattering of Light by Small Particles, Wiley & Sons, 2010

J. D. Jackson, Classical Electrodynamics, Wiley & Sons, 1998

Supplementary reading:

H. C. van de Hulst, Light Scattering by Small Particles, Wiley & Sons, 1957 (Dover, 1981)

M. I. Mishchenko, J. W. Hovenier, \& L. D. Travis, Light Scattering by Nonspherical Particles, Academic Press, 2000

M. I. Mishchenko, L. D. Travis & A. A. Lacis, Scattering, Absorption, and Emission of Light by Small Particles, Cambridge University Press, 2002

A. Doicu, Y. Eremin & T. Wriedt, Acoustic & Electromagnetic

Scattering Analysis Using Discrete Sources, Academic Press, 2000

 
Activities and teaching methods in support of learning 

The course is composed of exercises, a project, and a final exam.

 
Assessment practices and criteria 

The grading scale for accepted outcomes is 1-5 based on the final exam and the bonus points obtained from the exercises and the project work.

 


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