Bridging the THz Gap
Terahertz spectroscopy (1 THz = 1012 Hz) has emerged as a new spectroscopic technique mostly over the past two decades. This part of the electromagnetic spectra remained elusive for long since its emission and detection relies on ultra-short laser pulses. Thus, only after the invention of ultrafast LASERs it was possible to access the THz gap. Initially research on Terahertz spectroscopy was predominantly directed to its generation and detection. Even now though researchers are putting a lot of endeavor on newer and better method of THz generation and detection and trying to explain the theory behind the same, greater impetus has been put on applications of Terahertz spectroscopy. Terahertz spectroscopy finds its applications in solid state physics, biology, pharmaceuticals and security screening. More elaborately Terahertz spectroscopy can be used to delve into charge carrier dynamics in semiconductors and nano materials; librational modes of water and other liquids; hydration shell around amino acids, sugars and proteins.