Abstract
In the recent past, terahertz (THz) radiation with its applications in sensing, imaging, and spectroscopy have received extensive attention. THz radiation offers significant scientific and technological potential in many fields by filling the gap between the microwave and optical regimes. However, guiding the THz wave still remains a challenge in this spectral region owing to the high loss from the finite conductivity of metals or the high absorption coefficient of dielectric materials and metal waveguides. In addition to this, heavy usage of broadband pulses in the THz regime levies additional constraints on dispersion rises compatibility issues thus affects spectroscopic applications. In the recent past, a number of these challenges have been addressed by guiding the THz waves through a waveguide namely endoscopy. So, in this chapter, we cover the endoscopy technologies developed in the recent past to show how a simple waveguide can be used to transport THz pulses with virtually no dispersion, low attenuation, and with remarkable structural simplicity. We also cover the healthcare applications demonstrating an endoscope for THz pulses.
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