日本語 中文 PRODUCTS APPLICATIONS TECHNOLOGY COMPANY CAREERS CONTACT HOME TECHNOLOGY TECHNICAL TUTORIALS TERAHERTZ TERAHERTZ PROPERTIES Technology Technical Tutorials Tunable Diode Lasers Tapered Amplifiers Frequency Conversion Femtosecond Fiber Terahertz Terahertz Properties Terahertz Sources cw Terahertz Pulsed Terahertz Frequency Combs Phase and Frequency Locking of Diode Lasers TOPTICA Proprietary TOPTICA Python Laser SDK Terahertz Properties Between microwaves & infrared Frequency range 100 GHz .. 10 THz, wavelengths 3 mm .. 30 µm Also known as far-infrared or sub-millimeter waves Non-ionizing, but penetrates clothing, paper, cardboard, plastics, … Absorbed by water and many organic substances High chemical sensitivity The terahertz range refers to electromagnetic waves with frequencies between 100 GHz and 10 THz, or wavelengths between 3 mm and 30 μm. Light between radio waves and infrared has some unique properties. Terahertz can “look inside” plastics and textiles, paper and cardboard. Many biomolecules, proteins, explosives or narcotics also feature characteristic absorption lines, so-called spectral “fingerprints”, at frequencies between 0.1 and 5 THz. The two main advantages of terahertz radiation are thus the penetration of conventionally opaque materials on one hand, and a high chemical selectivity on the other hand. One of the strongest absorbers for terahertz radiation is water, which – depending on the application – turns out to be a blessing or a curse: Air moisture limits the propagation of terahertz rays to a few meters, but vice versa, the characteristic fingerprint enables a high precision in humidity-sensitive measurements. Liquid water is an even more dominant absorber than water vapor. Unlike X-rays, terahertz waves do not have any ionizing effects and are generally considered biologically innocuous. Careers Contact Sitemap Imprint Privacy Policy