Physics and Applications of Terahertz Radiation

Abstract

THz Detectors 1 Quantum Well Photodetectors Fabrizio Castellano. 1.1 Fundamentals of photoconductors and photodiodes. 1.2 Semiconductor quantum wells. 1.3 Intersubband transitions. 1.4 Transport in multi-quantum-well systems. 1.5 Quantum well detectors. 1.6 Quantum dot detectors. 2 Bolometric Detectors Francois Simoens. 2.1 Bolometric detection. 2.2 Cooled THz bolometers. 2.3 Uncooled THz bolometers. 2.4 Conclusions. 2.5 Acknowledgements. 3 Terahertz Plasma Field-Effect Transistors Wojciech Knap, Dominique Coquillat, Nina Dyakonova, Dmitry But, Taiichi Otsuji and Frederic Teppe. 3.1 Introduction. 3.2 Experiments on THz Emission from Field Effect Transistors. 3.3 Experiments on THz Detection by Field Effect Transistors. 3.4 Detection by double grating gate FETs. 3.5 Summary. THz Sources. 4 Quantum Cascade Lasers Douglas Paul. 4.1 Background. 4.2 Quantum wells and quantum mechanical tunneling. 4.3 QCL lasing requirements. 4.4 Gain in quantum cascade lasers. 4.5 Active region designs. 4.6 Waveguide designs and losses. 4.7 Exemplar experimental laser results. 4.8 Future requirements from THz quantum cascade lasers. 4.9 Summary. 5 Relativistic Electrons Based Sources Andrea Doria. 5.1 The Electron Photon Interaction. 5.2 The Free Electron Laser (FEL) Mechanism. 5.3 Compact FELs. 5.4 The Frascati FEL Facility. 5.5 The Compact Advanced THz Source (CATS). 6 Non-linear Optical Generation Graeme Malcolm, David A. Walsh, Marc Chateauneuf. 6.1 Intracavity THz generation in OPOs. 6.2 Application of Intracavity THz OPO in stand-off spectroscopy. Systems and Applications. 7 THz Control with Metamaterials David R. S. Cumming, Timothy D. Drysdale, James P. Grant. 7.1 Diffractive optics. 7.2 Polarisation control. 7.3 Terahertz filters. 7.4 Metamaterials and surface plasmon resonance. 7.5 Summary. 8 Time Domain Spectroscopy Jean-Francois Roux, Frederic Garet, Jean-Louis Coutaz. 8.1 Introduction. 8.2 Principles of THz-TDS. 8.3 Generation and detection of short electromagnetic pulses. 8.4 Characteristics of a TDS setup. 8.5 Principles for extraction of optical parameters from THz-TDS measurements. 8.6 Examples of applications of THz-TDS. 8.7 Uncertainties and precision of THz-TDS. 8.8 Comparison with FTIR measurements. 8.9 Conclusions. 9 Security and Safety Roger Appleby, Martyn Chamberlain. 9.1 Overview. 9.2 Nature of security threats, ethical considerations. 9.3 Physical principles. 9.4 Review of previous topical reviews (2006-2010). 9.5 Review of available commercial and near-to-market systems. 9.6 New developments. 9.7 Terahertz safety. 9.8 Overall conclusions.