Nanowire Waveguiding, Plasmonic Modulators and Thin Films for Integrated Photonics

Nanowire Waveguiding, Plasmonic Modulators and Thin Films for Integrated Photonics
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ABSTRACT The integration of micro/nano-photonic devices is an area of increasing importance in information technology and has motivated significant recent research activities in exploring nanowire waveguiding and surface plasmonics. In this thesis we introduce the main characteristics of nanowire waveguiding and plasmonic modulators, emphasizing the difference in their characteristics compared to conventional optics. Fabrications of multilayer thin films at nanoscale are also discussed to show their application as plasmonic modulators for the development of advanced optical devices. The thesis restrains the three major researches works; namely, nanowire waveguiding, plasmonic modulators and thin films, for the application in the field of integrated photonics. For nanowire waveguiding, we propose a new theoretical model to explain the mechanism of light wave propagation through non-metallic nanowires of sub-diffraction dimension. This model is assuming that unbound electrons on the surface of a non-metallic nanowire form an infinitesimally thin layer of quasi-free two dimensional electron gases that is responsible for collective oscillation and thus lightwave can propagate as surface waves. Dispersion relations and power propagation is discussed for the proposed model. We believe that our model would be useful for integrated nanophotonic circuit. For plasmonic modulators, we discuss the design and FEM simulation results of two plasmonic modulators using elasto-optic effects (i) utilizing three parallel metal-dielectric-metal waveguides as a directional coupler structure and (ii) Subwavelength Mach-Zehnder Interferometer as a plasmonic modulator. The effect of the applied voltage on the modulation is also analyzed for both modulators. For thin films, we discuss the fabrication of two multilayer transparent conducting oxide (TCO) films namely IZO/Al/GZO/ZnO and AZO/Al/ZnO multilayer films to achieve high conductivity and high transmittance. In the first multil
Chapter 1: Introduction 1 1.1 Integrated Photonics 1 1.2 Thesis Outline 3 1.21 Nanowire waveguiding 3 1.22 Plasmonic modulators 5 1.23 Thin Films as active plasmonics 8 References 12 Chapter 2: Nanowire Waveguiding 14 2.1 Introduction 14 2.2 Model and Theory 16 2.21 TE mode 22 2.22 TM mode 24 2.23 Power 25 2.3 Dispersion Relation 26 2.31 Effect of diameter 30 2.32 Effect of internal interaction forces of electrons 32 2.4 Power Propagation 33 2.5 Reliability of the Model 36 2.6 Summary 39 Reference 40 Chapter 3: Plasmonic Modulators 42 3.1 Introduction 42 3.2 Modulator Design and Theory 46 3.21 Modulator concept 49 3.22 Elasto-optic effect 50 3.23 Dispersion 53 3.3 Optimization of Optical Modulator Parameters 54 3.31 The effect of phase mismatching 55 3.32 The effect of mode mismatching 57 3.4 Modulation Characteristic 59 3.41 Active switching of power 60 3.42 Effect of applied voltage 64 Conclusion 66 3.5 Design Structure and Theory 67 3.6 Effect of Geometrical Parameters 72 3.7 Modulation 77 Conclusion 81 3.8 Summary 82 References 85 84 Chapter 4: Thin Films as Active Plasmonics 86 4.1 Introduction 86 4.11 Carrier modulation in active plasmonics 87 4.12 Multilayer TCO film 89 4.2 Fabrication Method 95 4.3 Electrical and Optical Properties 96 Conclusion 103 4.4 Fabrication Method 104 4.5 Electrical and Optical Properties 106 Conclusion 110 4.6 Summary 111 References 112 Chapter 5: Thesis Summary 114
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College of Engineering(공과대학) > Graduate School of IT & Telecommunications (정보통신대학원) > Theses(정보통신대학원 석박사 학위논문)
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