목차

Chapter 1 Introduction 1
1.1 Overview of SHG Imaging in 2D Materials . 1
1.2 Outline of the Thesis 2
Chapter 2 Background 4
2.1 Principles of Nonlinear Optical Response . 4
2.2 Second Harmonic Generation (SHG) 5
2.3 Transitional-metal Dichalcogenides (TMDs) 8
2.4 SHG Processes in TMDs 9
2.5 SHG Modulation in TMDs 11
2.5.1 Twist Angle Dependent SHG in Bilayer TMDs . 12
2.5.2 Strain induced SHG modulation. 16
2.6 Laser Ablation. 19
Chapter 3 In-situ SHG Imaging in Twisted Bilayer MoS2 25
3.1 Introduction . 25
3.2 Methods . 27
3.3 High-Speed SHG Imaging Setup 28
3.4 Analysis of SHG Intensity in Twisted Bilayer MoS2 . 31
3.5 Summary 35
Chapter 4 Femtosecond Laser Induced Layer-by-Layer Thinning in Twisted Bilayer MoS2 36
4.1 Introduction . 36
4.2 Analysis of Laser Ablation in Monolayer MoS2 37
4.3 Layer-by-Layer Control in Twisted Bilayer MoS2 40
4.4 Summary 43
Chapter 5 Microbial Control Over SHG in Monolayer MoS2 . 44
5.1 Introduction . 44
5.2 Methods . 45
5.3 SHG Imaging for Biomaterial Strain Monitoring 48
5.4 Summary 62
Chapter 6 Label-free Single Bacteria Identification with Rapid SHG imaging 63
6.1 Introduction . 63
6.2 SHG Imaging for MoS2 Bacteria Monitoring 66
6.3 Transient SHG Signals and Rupture Times Analysis. 69
6.4 Distinction of Different Bacterial Species in Single Cell Level 71
6.5 Summary 77
Chapter 7 Conclusions and Outlook 78
Appendix 80
Appendix A Scanning Photocurrent Microscopy on TMD heterostructure devices 80
Appendix B Rapid THZ Time-of-Flight Imaging for Conductivity Assessment of Graphene 93
Bibliography 108
국문 요약 132
List of Publication 134