Surface magneto-plasmons in magnetic multilayers - Walther ...

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4 Chapter 1 Introduction
Chapter 2 Theory In this chapter a short overview of the theoretical basics of surface plasmons is given, where the focus is on the aspects necessary to understand and interpret the experimental results. At first, the nature of surface plasmons is discussed, leading to the dispersion relation for surface plasmons. Next, the reflectivity of single and multi layer systems is derived and simulations are presented and discussed. Finally, the interactions of surface plasmons with an external magnetic field is considered. 2.1 Surface Plasmon Polaritons Collective longitudinal oscillations of quasi-free electrons in a metal or semiconductor are called plasmons. When these oscillations propagate along the interface of a metal and a dielectric medium (or vacuum), they are called surface plasmons. For surface plasmons the component of the electromagnetic wave perpendicular to the interface decays exponentially, what can be described by an evanescent wave. Thus, the surface plasmons are localised near the interface, giving rise to an enhancement of the electromagnetic field [9, 22]. The enhancement can be explained and calculated by regarding energy conservation [23]. 2.2 Dispersion relation Plasmons in general can be described by a plane wave. A(r, t) = A0e i(kr − ωt) . (2.1) Here, k = (kx, ky, kz) is the wave vector, r = (rx, ry, rz) the position vector, ω the 5
Page 1: TECHNISCHE UNIVERSITÄT MÜNCHEN WA
Page 4 and 5: II Contents 4.2 Reflectivity of mul
Page 6 and 7: 2 Chapter 1 Introduction via a grat
Page 10 and 11: 6 angular frequency, t the time, an
Page 12 and 13: 8 Chapter 2 Theory Here, µ (1) =
Page 14 and 15: 10 electron density. Chapter 2 Theo
Page 16 and 17: 12 Chapter 2 Theory [8]. In this co
Page 18 and 19: 14 2.3.1 Reflectivity of a single l
Page 20 and 21: 16 Chapter 2 Theory curve shown in
Page 22 and 23: 18 t 10 t 10 t 10 r 01 E 0 r 10 e i
Page 24 and 25: 20 Chapter 2 Theory Hereby, i = 1,
Page 26 and 27: 22 2.4 Simulation of the reflectivi
Page 28 and 29: 24 dopt = |ε ′(1) | − 1 4π |
Page 30 and 31: 26 p R 1 .0 0 .8 0 .6 0 .4 0 .2 0 .
Page 32 and 33: 28 2.5.1 Interaction of an external
Page 34 and 35: 30 ω |k x | Chapter 2 Theory Figur
Page 36 and 37: 32 Chapter 2 Theory enhancement wil
Page 38 and 39: 34 LASER lter beam splitter polaris
Page 40 and 41: 36 (a) εsubstrate εCo ε prism ε
Page 42 and 43: 38 Chapter 3 Excitation of surface
Page 46 and 47: 42 p h o to -d e te c to r s ig n a
Page 48 and 49: 44 9 0 8 5 8 0 7 5 7 0 6 5 6
Page 50 and 51: 46 5 V 0 V U out Chapter 3 Excitati
Page 54 and 55: 50 U A-B (θ) [V] 0.00 -0.05 -0.10
Page 56 and 57: 52 U A -B (θ) [V ] U A (θ) [V ] U
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54 will be discussed. 4.1.1.2 Deter
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56 p R 1 .0 0 .8 0 .6 0 .4 0 .2 0 .
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58 p R 0 .8 0 .4 0 .0 0 .8 0 .4
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60 Chapter 4 Experimental study of
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66 4.4 Summary Chapter 4 Experiment
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70 Chapter 5 Surface plasmons in ma
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72 U A -B , -1 5 m T (θ) [V ] 0 .0
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76 Δ θ 0 2 0 1 5 1 0 5 0
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80 ΔU θ = c o n s t (θ) [m V ]
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84 p x 1 0 -4 p /δθ 1 /R δR 0 .5
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86 δU /U (H ) x 1 0 -3 2 .5 2 .0 1
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90 s M /M 1 .5 1 .0 0 .5 0 .0 -0 .5
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94 Chapter 6 Conclusions and Outloo
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100 Chapter 6 Conclusions and Outlo
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102 (*Thickness of the layers in An
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104 /Extract[Ms[lambda, theta], {1,
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106 40 mm 10 mm 130 mm Figure B.2:
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108 and d sin 45 = h/2 sin(90 + θ)
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110 Appendix C Prism correction
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112 Appendix D Code for SPP simulat
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114 (*MO Reflectivity*) Appendix D
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116 Bibliography [12] J. Weeber, E.
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118 Bibliography [40] A. A. Maradud
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120 Bibliography [67] F. E. Luborsk
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122 Bibliography [93] T. Sidiropoul
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Robert Müller, Helmut Thies and hi
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