Introduction to THz Wave Photonics (eBook)

Introduction to THz Wave Photonics 1
Preface 4
Contents 7
1 Terahertz Radiation 10
Introduction to THz Radiation 10
THz Research History and Present 15
Prospective 26
References 29
2 Generation and Detection of THz Waves 36
Photoconductive Antenna 36
Built-In Field in Semiconductor 40
Photo-Dember Effect 43
Optical Rectification 45
Electro-optical Sampling 49
Broad Band Generation and Detection 52
Tilted Pulse Front 54
Quasi-Phase-Match 56
References 57
3 THz Spectroscopy and Imaging 58
THz Time-Domain Spectroscopy 58
Dynamic Range of THz-TDS 61
Detection of a THz Waveform Using a Single Laser Pulse 64
THz Differential Spectroscopy 67
THz Wave Imaging 69
2-D Focal Plane THz Wave Imaging 70
Telecentric Beam Scanning THz Wave Imaging 73
Time-of-Flight Imaging 74
Synthetic Aperture and Interference Imaging 75
References 78
4 THz Wave Interaction with Materials 79
Dielectric Constant in the THz Band 79
Refractive Index in the THz Band 82
Characterize Carrier Properties Using THz Wave Spectroscopy 83
THz Wave Interaction with Resonant States 84
THz Wave Reflection Spectroscopy and Phonon Oscillation 86
Interaction Between Phonon and Free Carriers THz Wave Emission Spectroscopy 88
THz Wave Propagating in Free Space 89
The Waveguide Propagation of a THz Wave 92
THz Wave and Photonic Crystal 95
Surface Plasmon and Metamaterial 96
References 102
5 THz Air Photonics 104
THz Wave Generation in Ambient Air 104
Detection of THz Waves in Gases 114
Optimization of THz Systems Based on Gas Photonics 122
THz Wave Air Break-Down Coherent Detection (ABCD) System 124
THz Radiation Enhanced-Emission-of-Fluorescence (THz-REEF) from Gas Plasma 126
References 131
6 THz Wave 3D Imaging and Tomography 133
T-Ray Computerized Tomography 133
T-Ray Diffraction Tomography 139
3Dimensional Imaging Using Fresnel Lens 145
References 154
7 THz Wave Near-Field Imaging 155
Spatial Resolution in Near-Field Imaging 155
Apertured THz Near-Field Imaging 158
THz Near-Field Imaging with a Dynamic Aperture 162
THz Near-Field Imaging with Small Emitter or Detector 163
THz Near-Field Imaging by Tip Scattering 169
THz Wave Near-Field Imaging by Absorption in Metallic Tip 172
Tip Enhanced THz Emission Near-Field Imaging 174
References 180
8 THz Technology in Nondestructive Evaluation 181
Carrying on NDE with THz Waves 182
Attenuation of THz Wave The Physics Behind Reorganization 185
Space Shuttle Foam Inspection 191
Armor Plate Inspection 195
Rust Under Paint 199
Carbon Fiber Composites Inspection 200
9 THz Technology in Security Checks 206
Spectra of Explosives in THz Band 206
Remote Sensing with THz Wave 213
THz Wave Stand-Off Detection 218
THz Wave Spectroscopic Imaging 222
References 224
10 THz Technology in Bio and Medical Applications 225
THz Wave Spectra of Small Biomolecules 225
THz Wave Spectra of Biomacromolecules 227
THz Wave Differential Spectroscopy and Biomolecule Identification 230
Hydration of Molecules and Its Response in THz Wave Spectroscopy 232
Using THz Technologies in Quality Control of Pharmaceutical Products 234
THz Wave Spectroscopy of Cells and Tissues 236
THz Wave Imaging in Medical Diagnostics 237
References 239
Additional Reference 241
Index 242