alexa Terahertz Time-Domain Spectroscopy

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Terahertz Time-Domain Spectroscopy

Terahertz (THz) waves are a form of electromagnetic wave, like gamma-rays, X-rays, ultraviolet light, visible light, infrared light, radio and microwaves (Figure 1). On the frequency spectrum, the THz region of the electromagnetic spectrum spans the frequency range between the microwave and the mid-infrared (300 GHz - 30 THz). The center portion of the THz region offers an unique combination of many remarkable properties: (1) like infrared radiation, THz radiation gives rise to individual ‘fingerprints’ spectra for many crystalline materials, making THz spectroscopy a useful tool for material characterization; (2) like microwave, THz radiation can penetrate deep into most polymer and clothing materials, thus THz imaging can be used to map internal structures of a sample; (3) it is safe to use THz radiation as its photon energy is millions of times smaller than that of X-rays. The combination of these properties makes THz technology a potentially very powerful technique for a range of imaging and spectroscopy applications............ Read More

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