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The terahertz region (0.1 to 10 THz, as shown in the figure below) of the electromagnetic spectrum lies between the microwave (electronics) and infrared (optics) regions. This part of the spectrum relatively unexplored due to the lack of suitable sources and detectors. However, with the recent development in the femtosecond lasers and other optical devices, several novel applications of terahertz waves can be anticipated.
—Terahertz radiation is non-ionising due to its low photon energy, and therefore, it can be used for imaging the human body organs, such as the skin.
—Unlike visible or infrared light, THz radiation can penetrate materials such as plastic, cloth or paper products. This feature can be utilized for sensing and imaging hidden objects as well as for quality assessment of certain industrial products.
—THz waves are less prone to Rayleigh scattering and transparent to powders, smoke, fog etc.
—Short-range wireless communication with very high data transfer rate is possible using T-rays.
—THz wave is strongly absorbed by the water-containing materials. Terahertz wave also exhibit fingerprint spectra for macromolecules like sugar, proteins, DNA and other bio-molecules.
Figure: Electromagnetic spectrum
Current research interests
Current research interests
High power terahertz wave sources
Biomedical applications of terahertz waves
Novel devices for the manipulation of THz waves properties
Dielectric properties measurement of various materials using terahertz time domain spectroscopy (transmission mode, reflection mode and attenuated total reflection mode).
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