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광결정과 플라즈모닉 나노구조를 이용한 나노광소자 연구

A study on Nanophotonic Devices using Photonic Crystals and Plasmonic Nanostructures

초록/요약

Nanophotonic research deals with electromagnetic waves in ultraviolet, visible, infrared,and telecommunication wavelengths from approximately 300 to 1600 ㎚. Extraordinary properties of nanophotonics are hoped to materialize a new generation of optoelectronic devices that are light-weight, high-performance, cost-effective and consume low power. Future perspectives show a great promise of nanophotonics based applications to revolutionize telecommunication, computing, and sensing fields. In this dissertation, author presents a numerical calculation on optical devices having nanophotonic components. In particular, light confining structures such as photonic crystals and plasmonic nanostructures that can be able to slow, enhance, and manipulate light are of interest. The main focus of this work is theoretically investigate how to design nanophotonic devices made of photonic crystals and plasmonic nanostructures with a special emphasis on potential applications, e.g., the zero group velocity waveguide structure based on a negative refraction in photonic crystals, novel tapering schemes for slow-light coupling into photonic crystal waveguides, optical bistable devices based on guided-mode resonance in slab waveguide gratings, all-optical bistable switching based on cascaded-resonators in photonic crystals, and waveguides and cavities in hybrid plasmonic structures. The numerical simulation of such systems has been carried out using the finite-difference timedomain method with the perfectly matched layer boundary condition and plane wave eigensolver methods.

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목차

Chapter 1: Introduction 1
1.1 Introduction to nanophotonics 1
1.2 Introduction to photonic crystals 1
1.3 Introduction to surface plasmon resonances 3
1.4 Organization of dissertation 4
References 5
Chapter 2: Computational Methods 6
2.1 Introduction 6
2.2 Plane wave eigensolver method 9
2.2.1 Fundamental theory 9
2.2.2 Plane wave eigensolver with Bloch-Floquet theorem 11
2.2.3 The physical origin of the photonic band gaps 12
2.3 Finite-difference time-domain (FDTD) method 13
2.3.1 General features 13
2.3.2 Stability of the FDTD method 15
2.3.3 FDTD method using boundary conditions and symmetries 16
References 18
Chapter 3: Zero Group Velocity based on Negative Refraction in Photonic Crystals 20
3.1 Introduction 20
3.2 Design and discussion of zero group velocity 21
3.3 Negative refraction effect in photonic crystals 23
3.3.1 Negative refraction and all-angle negative refraction 23
3.3.2 Negative and refraction at an interface 28
3.4 Light trapping in photonic crystals 32
3.5 Potential applications 33
3.6 Summary 35
References 35
Chapter 4: Novel Tapering Schemes for Slow-Light Coupling in Photonic Crystal Waveguides 37
4.1 Introduction 37
4.2 Design and numerical calculations 38
4.3 Summary 45
References 46
Chapter 5: Optical Bistable Devices based on Guided-Mode Resonance in Slab Waveguide Gratings 48
5.1 Introduction 48
5.2 Bistability in single-grating devices 49
5.3 Optical bistability in coupled gratings 57
5.4 Summary 60
References 61
Chapter 6: All-Optical Bistable Switching based on Cascaded-Resonators in Photonic Crystals 63
6.1 Introduction 63
6.2 Theoretical study for cascaded-resonators structures 64
6.3 Linear calculations in cascaded-resonators structures 66
6.4 All-optical bistable switching based on cascaded-resonators 67
6.5 Summary 72
References 73
Chapter 7: Waveguides and Cavities in Hybrid Plasmonic Structures 75
7.1 Introduction 75
7.2 Theoretical analysis for 1D hybrid slot waveguides 78
7.3 Ultrahigh Q/V values in silver nanoparticle coupled to dielectric waveguide 82
7.4 Summary 87
References 87
Chapter 8: Conclusion and Future Work 89
8.1 Conclusion 89
8.2 Future work 90
Appendix 93

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