Terahertz quantum well photodetectors for imaging – Complete Phd and Masters Thesis

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Introduction

Terahertz (THz) radiation has gained significant attention in recent years due to its potential in a wide range of applications including security screening, medical imaging, and communication. One of the key components for harnessing the power of THz radiation is the development of efficient and high-performance photodetectors. Quantum well photodetectors have shown promise in this regard due to their unique electronic properties and potential for tuning the absorption wavelength by adjusting the thickness of the quantum well layers.

This thesis focuses on the design, implementation, and evaluation of Terahertz quantum well photodetectors for imaging applications. The goal of this research is to develop a high-performance photodetector that can effectively capture and detect THz radiation for imaging purposes. The thesis will explore the theoretical background of quantum well photodetectors, review relevant literature, design and implement a photodetector system, and evaluate its performance for imaging applications.

Table of Contents

Chapter 1: Introduction
1.1 Introduction
1.2 Background of Study
1.3 Problem Statement
1.4 Objective of Study
1.5 Limitation of Study
1.6 Scope of Study
1.7 Significance of Study
1.8 Structure of the Thesis
1.9 Definition of Terms

Chapter 2: Literature Review
2.1 Introduction to Terahertz radiation
2.2 Quantum well photodetectors
2.3 Principles of operation
2.4 Design considerations
2.5 Performance metrics
2.6 Challenges and limitations
2.7 Recent advancements in the field
2.8 Comparison with other photodetector technologies
2.9 Applications in imaging
2.10 Summary of key findings

Chapter 3: System Design and Methodology
3.1 System requirements
3.2 Photodetector design
3.3 Material selection
3.4 Fabrication process
3.5 Testing and calibration
3.6 Data acquisition and processing
3.7 Imaging algorithm
3.8 Performance evaluation

Chapter 4: System Implementation
4.1 Fabrication of photodetector prototype
4.2 Integration with imaging system
4.3 Experimental setup
4.4 Data collection
4.5 Image reconstruction
4.6 Performance optimization
4.7 Validation and testing
4.8 Results and analysis

Chapter 5: Conclusion and Summary
5.1 Summary of findings
5.2 Conclusions
5.3 Recommendations for future research
5.4 Contribution to the field
5.5 Implications for imaging applications

Thesis Overview

Terahertz (THz) radiation lies in the electromagnetic spectrum between microwave and infrared wavelengths, offering unique capabilities for imaging applications. Traditional imaging techniques have limitations in terms of resolution, contrast, and safety. THz imaging provides non-invasive, non-ionizing, and high-resolution imaging capabilities, making it attractive for a wide range of applications including security screening, medical imaging, and industrial inspection.

Quantum well photodetectors have emerged as a promising technology for harnessing THz radiation due to their tunable absorption wavelength, high responsivity, and fast response time. This thesis aims to explore the design, implementation, and evaluation of Terahertz quantum well photodetectors for imaging applications. By developing a high-performance photodetector system, this research seeks to advance the field of THz imaging and address current limitations in imaging technology.

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