Sangin Kim TRAN, Quyet Thang 2017-02 24616 https://aurora.ajou.ac.kr/handle/2018.oak/12298 학위논문(박사)--아주대학교 일반대학원 :전자공학과,2017. 2 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 eng The Graduate School, Ajou University 아주대학교 논문은 저작권에 의해 보호받습니다. A Study on Graphene-Based Efficient Light Modulating Devices TRAN Quyet Thang Thesis 아주대학교 일반대학원 TRAN Quyet Thang 일반대학원 전자공학과 2017. 2 Doctoral http://dcoll.ajou.ac.kr:9080/dcollection/jsp/common/DcLoOrgPer.jsp?sItemId=000000024616 optical modulator graphene frustrated total internal reflection epsilon near zero 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.