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Coherent Backscattering from Multiple Scattering Systems - KOPS ...

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Contents<br />

Ein kurzer Überblick<br />

i<br />

Danksagungen<br />

iii<br />

Contents<br />

vi<br />

1 Introduction 1<br />

2 Theory 3<br />

2.1 The wave equation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3<br />

2.2 Single scattering – Mie theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5<br />

2.3 Random walk and diffusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9<br />

2.4 The influence of boundaries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12<br />

2.5 Photon flux <strong>from</strong> a surface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15<br />

2.6 On polarization and interference . . . . . . . . . . . . . . . . . . . . . . . . . . . 17<br />

2.7 The theory of coherent backscattering . . . . . . . . . . . . . . . . . . . . . . . . 20<br />

3 Setups 25<br />

3.1 Laser System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25<br />

3.2 Wide Angle Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25<br />

3.3 Small Angle Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28<br />

3.4 Time Of Flight Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33<br />

4 Samples 35<br />

4.1 Sample characterization techniques . . . . . . . . . . . . . . . . . . . . . . . . . 35<br />

4.2 The samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

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