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Breakthroughs Bring THz Spectroscopy, Sensing Closer to Mainstream

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Advances in terahertz optical frequency comb operations have helped make possible single-mode THz emission in a wide spectral range at high powers.

MANIJEH RAZEGHI, QUANYONG LU, SANTANU MANNA, DONGHAI WU AND STEVEN SLIVKEN, NORTHWESTERN UNIVERSITY

The terahertz (THz) electromagnetic spectrum (1 to 10 THz), sitting between the infrared wavelengths on the higher frequency side and microwaves on the lower frequency side, has unique and important properties. THz waves can pass through a number of materials, including synthetics, textiles, paper and cardboard. Many biomolecules, proteins, explosives or narcotics feature characteristic absorption lines — so-called spectral “fingerprints” — at frequencies between 1 and 10 THz. The two main advantages of THz radiation are the penetration of conventionally opaque...Read full article

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    Published: November 2016
    Glossary
    metrology
    Metrology is the science and practice of measurement. It encompasses the theoretical and practical aspects of measurement, including the development of measurement standards, techniques, and instruments, as well as the application of measurement principles in various fields. The primary objectives of metrology are to ensure accuracy, reliability, and consistency in measurements and to establish traceability to recognized standards. Metrology plays a crucial role in science, industry,...
    quantum cascade laser
    A quantum cascade laser (QCL) is a type of semiconductor laser that operates based on the principles of quantum mechanics. It is a versatile and powerful device used for emitting coherent light in the mid-infrared to terahertz range of the electromagnetic spectrum. Quantum cascade lasers were first proposed by Federico Capasso, Jerome Faist, Deborah Sivco, Carlo Sirtori, Albert Hutchinson, and Alfred Cho in 1994. Key features and principles of quantum cascade lasers: Quantum cascade...
    metrologyLasersImagingspectroscopyTHzterahertz imagingManijeh RazeghiNorthwestern University THz sourcesQCLquantum cascade laserSchottky–diode based multipliersGunn diodesresonant-tunneling diodesmid-IRThz spectroscopyoptical frequency combsspectral fingerprintsFeatures

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