P7 – Scattering of Surface Plasmon Polaritons by Gold ... - repetit.dk
P7 – Scattering of Surface Plasmon Polaritons by Gold ... - repetit.dk
P7 – Scattering of Surface Plasmon Polaritons by Gold ... - repetit.dk
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Contents<br />
1 Introduction 9<br />
1.1 <strong>Surface</strong> <strong>Plasmon</strong> <strong>Polaritons</strong> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9<br />
1.2 SPP based Microprocessors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10<br />
1.3 Focusing <strong>of</strong> SPPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10<br />
1.4 Leakage Radiation Microscopy . . . . . . . . . . . . . . . . . . . . . . . . . . . 10<br />
1.5 Biosensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11<br />
1.6 Purpose <strong>of</strong> the Project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12<br />
2 Theory 13<br />
2.1 Physics <strong>of</strong> SPPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13<br />
2.1.1 SPP Dispersion Relation . . . . . . . . . . . . . . . . . . . . . . . . . . . 14<br />
2.1.2 Excitation <strong>of</strong> SPP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17<br />
2.1.3 Quantitative Description <strong>of</strong> Minimum Reflected Intensity . . . . . . . . 19<br />
2.1.4 Attenuated Total Reflection - ATR . . . . . . . . . . . . . . . . . . . . . 20<br />
2.1.5 Spatial Extension and Propagation Lenght <strong>of</strong> SPPs . . . . . . . . . . . . 21<br />
2.2 Scalar Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23<br />
2.3 Single Particle <strong>Scattering</strong> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25<br />
2.4 Vectorial Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26<br />
2.4.1 Two Dipole Resonance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28<br />
2.4.2 Near Field <strong>of</strong> a Dipole . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30<br />
2.4.3 Indirect Propagator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31<br />
2.4.4 Relation to <strong>Surface</strong> <strong>Plasmon</strong> <strong>Polaritons</strong> . . . . . . . . . . . . . . . . . . 33<br />
2.4.5 Connection to Scalar Model . . . . . . . . . . . . . . . . . . . . . . . . . 34<br />
2.4.6 In Plane <strong>Scattering</strong> <strong>of</strong> SPPs . . . . . . . . . . . . . . . . . . . . . . . . . 35<br />
3 Numerical Results 39<br />
3.1 Scalar Model Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39<br />
3.1.1 Single Particle <strong>Scattering</strong> . . . . . . . . . . . . . . . . . . . . . . . . . . 39<br />
7