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Terahertz spectroscopy. --- Surface plasmon resonance. --- DNA --- Analysis.

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Novel THz device concepts and signal processing schemes are introduced and experimentally confirmed. Record-high data rates are achieved with a simple envelope detector at the receiver. Moreover, a THz communication system using an optoelectronic receiver and a photonic local oscillator is shown for the first time, and a new class of devices for THz transmitters and receivers is investigated which enables a monolithic co-integration of THz components with advanced silicon photonic circuits.

Electrical engineering --- Terahertz Kommunikation --- Drahtlosnetzwerke --- 6G --- Optoelektronische Signalverarbeitung --- Silizium Plasmonik --- Terahertz communication --- Wireless networks --- Optoelectronic signal processing --- Silicon plasmonics

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Terahertz frequency sensing has a unique part to play in the detection and identification of materials and objects. This frequency range, corresponding to a wavelength of around 0.1 mm, can be used to identify materials from their molecular spectra and to produce images of concealed objects. Terahertz spectra of drugs of abuse and explosives presented by a number of the contributing authors show that the presence of these materials can be detected in envelopes, packages and through clothing. The technology of terahertz detection has largely been developed around expensive and bulky femtosecond laser systems but, as described in this book, advances in semiconductor superlattice technology are leading to compact “electronic” sources such as the quantum cascade laser, two-terminal “Gunn” type oscillators and even a THz frequency amplifier. These advances towards electronic (as opposed to optical) THz systems mean that the technology will become portable and much less costly. Terahertz remote sensing is also discussed with the possibility of detection over distances of up to 30m using existing technology or even through the use THz waves generated locally in the vicinity of a target using only air as the transducer.

Terahertz spectroscopy --- Terahertz technology --- Scanning systems --- Congresses --- Scanning systems -- Congresses. --- Terahertz spectroscopy -- Congresses. --- Terahertz technology -- Congresses. --- Scanners --- Spectroscopy, Terahertz --- Materials science. --- Remote sensing. --- Lasers. --- Photonics. --- Engineering. --- Materials Science. --- Characterization and Evaluation of Materials. --- Engineering, general. --- Remote Sensing/Photogrammetry. --- Laser Technology, Photonics. --- High technology --- Electromagnetic devices --- Spectrum analysis --- Optoelectronic devices --- Radar --- Remote sensing --- Television --- Imaging systems --- Equipment and supplies --- Surfaces (Physics). --- Optics, Lasers, Photonics, Optical Devices. --- Construction --- Industrial arts --- Technology --- Physics --- Surface chemistry --- Surfaces (Technology) --- Light amplification by stimulated emission of radiation --- Masers, Optical --- Optical masers --- Light amplifiers --- Light sources --- Nonlinear optics --- Optical parametric oscillators --- Remote-sensing imagery --- Remote sensing systems --- Remote terrain sensing --- Sensing, Remote --- Terrain sensing, Remote --- Aerial photogrammetry --- Aerospace telemetry --- Detectors --- Space optics --- Material science --- Physical sciences --- New optics --- Optics