||All-fiber Rapid Photoluminescence and Raman Measurement System
||Department of Photonics
rapid mapping system
Raman and Photoluminescence (PL) spectroscopy are widely used in many fields, including physics, chemistry, materials science, biology, semiconductor, solar cell, and medicine. Until now, there are mature commercial products. It has many advantages, such as non-contact measurements, widely usages, rapid mapping measurements, and precise analysis. To improve the scanning efficiency of these instruments, we modify the optical design based on the design of traditional spectroscopy. Here, a hole mirror was also been imported in this system. And two kinds of measurement method, X-Y measurement and R-θ measurement method are being analyzed in this design of system.
However, to verify performance of this spectroscopy, we prepared many kinds of sample for testing, such as CVD graphene, mechanical exfoliation graphene, supported and suspended graphene, hydrogen-terminated graphene, MoS2, and AlGaAs. For experimental requirement, polarized Raman spectroscopy has been used and Origin is our fitting tool for Raman or PL spectra by Lorentzian function. Rapid mapping stage plays an important role in this research, too. It helps to execute the X-Y measurement or R-θ measurement method. In final goal to these spectroscopy, cheaper, more convenience, faster, modularization design, and automatic control by computer are been expected.
Chapter 1 Introduction 1
1-1. Research Motivation 1
1-2. Literature review 2
1-3. Overview of the Thesis 3
Chapter 2 Theoretical Background 5
2-1. Introduction of Samples 5
2-1.1. Graphene 5
2-1.2. MoS2, MoSe2, WSe2 8
2-1.3. AlGaAs 10
2-2. Introduction of Spectroscopy 12
2-2.1. Introduction of Raman Spectroscopy 12
2-2.2. Introduction of PL Spectroscopy 14
Chapter 3 Experimental Processes 18
3-1. Fabrication of samples 18
3-1.1. Graphene 18
3-2. Optical setup of system 21
3-2.1. The optical setup of Raman spectroscopy 21
3-2.2. The optical setup of PL spectroscopy 25
3-3. Measurement method 29
Chapter 4 Experimental Results and Discussions 32
4-1. Raman Measurement 32
4-1.1. Raman measurement of single layer graphene and analysis 32
4-1.2. Polarized Raman measurement of single layer graphene and analysis 37
4-1.3. Raman measurement of suspend and support graphene 51
4-1.4. Raman measurement of hydrogen-terminated graphene 55
4-1.5. Raman measurement of MoS2 57
4-2. PL Measurement 57
Chapter 5 Conclusion 62
5-1. Summary 62
5-2. Future Improvements 62
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