A Study on Graphene-Based Efficient Light Modulating Devices
A Study on Graphene-Based Efficient Light Modulating Devices
- 주제(키워드) optical modulator , graphene , frustrated total internal reflection , epsilon near zero
- 발행기관 Ajou University, Department of Electrical and Computer Engineering
- 지도교수 Sangin Kim
- 발행년도 2017
- 학위수여년월 2017. 2
- 학위명 박사
- 학과 및 전공 일반대학원 전자공학과
- 실제URI http://www.dcollection.net/handler/ajou/000000024616
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
One of the most important component of integrated photonics is a class of devices known as light modulation devices, which allow us to modulate and manipulate the flow of light, similar to the role transistor played in electronics. Only recently introduced, but graphene have shown incredible promises as a "miracle" material in electronics, with properties ranging from zero band gap, very high electrical mobility, ultra broadband optical responses, and the ability to drastically modify its optical properties through chemical or electrical doping. In this dissertation, the author presented several unique nanostructures to exploit the aforementioned graphene characteristics to create light modulation devices with superior performance characteristics. Novel effects including wide angle extraordinary reflection causes by epsilon near zero effect and wide angle extraordinary transmission causes by coupling of plasmonic supermodes, phase modulation with near unity amplitude transmission with all pass filter, and graphene perfect absorber with a coupled system of dual mode/single mode resonator was thoroughly investigated, theoretically and numerically. The effects was also presented in practical nanostructures better suited for applications, which are also numerically investigated with various numerical methods.
more목차
CHAPTER 1: INTRODUCTION 1
1.1 Introduction to Light Modulating Devices 1
1.2 Introduction to Graphene 1
1.3 Overview of the Numerical Methods 3
1.4 Organization of Dissertation 7
CHAPTER 2: TUNABLE WIDE-ANGLE TUNNELING IN GRAPHENE-ASSISTED FRUSTRATED TOTAL INTERNAL REFLECTION 9
2.1 Introduction 9
2.2 Frustrated Total Internal Reflection (FTIR) Effect 10
2.3 Controllable Wide Angle Tunneling Effect with ENZ Effect in FTIR Configuration 11
2.4 Waveguide-type optical modulator based on a GA-FTIR structure 20
2.5 Chapter Summary 26
CHAPTER 3: LOW LOSS ELECTRICALLY CONTROLLABLE VERTICALLY COUPLED DIRECTIONAL COUPLER 28
3.1 Introduction 28
3.2 Vertically Coupled Directional Coupler 29
3.3 Chapter Summary 40
CHAPTER 4: OPTICAL PHASE MODULATOR BASED ON GRAPHENE EMBEDDED ALL PASS FILTER 42
4.1 Introduction 42
4.2 Phase Modulating All Pass Filter with Graphene 42
4.3 Chapter Summary 48
CHAPTER 5: COUPLED MODE THEORY OF PERFECT GRAPHENE ABSORBERS IN DUAL-MODE/SINGLE-MODE COUPLED RESONATORS SYSTEM 50
5.1 Introduction 50
5.2 Dual Mode - Single Mode Coupled Resonators System 51
5.3 Temporal Coupled Mode Theory of the "Triple-mode absorber" 52
5.4 Numerical verification of the CMT 59
5.5 Chapter Summary 66
CHAPTER 6: CONCLUSION AND FUTURE WORK 68
6.1 Conclusion 68
6.2 Future Work 68
REFERENCES 70
APPENDIX: AUTHOR'S PUBLICATIONS LIST 79
