摘要:
A method of generating electromagnetic radiation in the terahertz frequency range is disclosed herein. In one embodiment, the method comprises the steps of providing a bi-layer heterojunction comprising a ferromagnetic metal layer adjacent a non-magnetic metal layer, wherein the non-magnetic layer comprises one of platinum or tungsten and applying a femtosecond laser beam to the heterojunction. The terahertz electromagnetic radiation may be generated by an inverse spin orbit interaction comprising an inverse spin Hall effect and/or inverse spin orbital torques. A terahertz emitter device and an apparatus for generating electromagnetic radiation in the terahertz frequency range are also described.
摘要:
An apparatus for detecting a material within a sample includes a light emitting unit for directing at least one light beam through the sample. A plurality of units receive the light beam that has passed through the sample and performs a spectroscopic analysis of the sample based on the received light beam. Each of the plurality of units analyze a different parameter with respect to the sample a provide a separate output signal with respect to the analysis. A processor detects the material with respect each of the provided separate output signals.
摘要:
Terahertz imaging systems for endoscopy are provided. Terahertz imaging systems can be utilized in scanning tissue. Terahertz imaging systems in accordance with embodiments of the invention can include terahertz sources, terahertz detectors, and/or rotating elements. The terahertz sources can generate terahertz radiation and have plasmonic contact electrodes that can be illuminated by optical pump beams. The terahertz detectors can receive terahertz field data. The terahertz source and detector can be arranged in an array. The rotating elements can be mirror mounted at a particular angle on a micromotor. Theterahertz source, rotating element, and terahertz detector can be arranged in an catheter.
摘要:
Eine Messvorrichtung (1) weist zur Vermessung eines Prüfobjekts (2) eine Sender-Empfänger-Einheit (3) zum Emittieren und Detektieren von Terahertz-Strahlung sowie eine zugehörige Spiegel-Anordnung (4) auf. Die Spiegel-Anordnung (4) umfasst einen ersten Spiegel (7), der in einer x-y-Ebene (E xy ) einen ersten Brennpunkt (Β 1 ) ausbildet, und einen zweiten Spiegel (19), der in der x-y-Ebene (Ε xy ) einen zweiten Brennpunkt ausbildet. Zur Umlenkung von Strahlung (S, R) zwischen den Brennpunkten sind die Spiegel (7, 19) parabelförmig gekrümmt. Weiterhin umfasst die Spiegel-Anordnung (4) einen dritten Spiegel (8), der im Bereich des ersten Brennpunkts (Β 1 ) angeordnet ist und zur Umlenkung der Strahlung (S, R) zwischen einer quer zu der x-y-Ebene (Ε xy ) verlaufenden z-Richtung und der x-y-Ebene (Ε xy ) dient. Mittels eines Prüfobjekthalters (5) ist das zu vermessende Prüfobjekt (2) im Bereich des zweiten Brennpunkts angeordnet. Die an dem Prüfobjekt (2) reflektierte Strahlung (R) wird mittels einer Steuereinheit (6) ausgewertet. Die erfindungsgemäße Messvorrichtung (1) ermöglicht auf einfache und flexible Weise die Vermessung des Prüfobjekts (2), insbesondere eine vollumfängliche Vermessung von als Kunststoffrohren mit kreisförmigem Querschnitt ausgebildeten Prüfobjekten (2).
摘要:
Robust terahertz time-domain spectrometer has a reflective surface arrangement that renders the sensor insensitive to x or y displacement. The apparatus includes: (a) first scanner head; (b) a first reflective surface; (c) emitter; (d) beam splitter to yield reference radiation pulses and sample radiation pulses; (e) first reflector to reflect sample radiation pulses that have been transmitted through the sample to generate reflected sample radiation pulses that are directed towards a web; (f) second reflector that reflects the reference radiation pulses to generate reflected reference radiation pulses that are directed towards the beam splitter which in turn transmits a portion of the reflected references radiation pulses towards the web; and (g) a detector that receives (i) the reflected sample radiation pulses that have interacted with the sample a plurality of times and (ii) reflected reference radiation pulses that have interacted with the sample a plurality of times.
摘要:
The present disclosure relates to methods for characterising electrically anisotropic samples by use of terahertz test signals having different orientations with respect to the sample.