Terahertz (THz) Mid Infrared (MIR) and Near Infrared (NIR) Technologies for Protection of Critical Infrastructures Against Explosives and CBRN Critical infrastructures are targets for terrorism and deliver a valuable vector through which the proliferation of CBRN and explosive precursors can be detected. Recent technological breakthroughs notably in the field of near infrared (NIR) mid infrared (MIR) Terahertz (THz) and Gigahertz (GHz) sources and detectors have led to rugged commercial devices capable of standoff sensing a range of these dangerous substances. However at the same time criminal and terrorist organizations have also benefited from the availability of technologies to increase the threat they pose to the security of citizens and a concerted effort is needed to improve early detection measures to identify activities such as the production of homemade explosives or CBRN that can be potentially dangerous to society. The key global technological bottleneck to be overcome is the current lack of integration and networking of mature detection technology into early warning systems for critical infrastructures. Thus this book brings together complementary information connecting the research of leading teams working on critical Infrastructure protection with academic developers and industrial producers of state of the art sensors. . Part I State of the Art in sensors for the protection of critical infrastructures 1 Sensor Data Fusion and Autonomous Unmanned Vehicles for the Protection of Critical Infrastructures Part II Beyond QCLs ICLs and Superlattices: competing technologies for detection of explosives and CBRN 2 High Power Widely Tunable and Beam Steerable Mid infrared Quantum Cascade 3 Broadband terahertz gas spectroscopy through multimode self mixing in a quantum cascade laser 4 Crucial aspects of the device processing of quantum cascade lasers 5 Broadband gas QEPAS detection exploiting a monolithic DFB QCL array 6 Global optimization methods for the design of MIR THz QCLs applied to explosives detection Part III Superlattices and other technologies for GHz THz sensing 7 Non Destructive testing THz systems: fast postal scanner case study 8 Recent advances in superlattice frequency multipliers 9 Solid State Millimeter Wave through Terahertz Transceivers 10 Transmission and reflection characteristics of textiles in the Terahertz range 11 Transition between localized and delocalized terahertz conductivity in modulated nanostructures studied by Monte Carlo calculations 12 THz Sources and Detectors Fabricated from High Temperature Superconductors 13 Semiconductor components for THz TDS systems activated by compact fibre lasers 14 Soft chemical ionization mass spectrometry analyses of hazardous gases and decomposition products of explosives in air 15 On the prospect of application of point contact sensors to solving the global security problems: an analytical review 16 Development of Gas Sensor Systems in the Infrared Region 17 Raman Cooperative UV Generation with Possible Applications in microbiology 18 THz Spectroscopy of Advanced Materials.