Doping Effects on Optical Properties of Titania Composite in Terahertz Range

Terahertz materials, with its absorption span in the infrared and microwave region, have been payed significant attention throughout the world, and day by day, new materials are being developed having potential applications in the terahertz range. While naturally occurring materials hardly respond to THz radiation, extensive research efforts established numerous materials as high absorbers in the THz domain. Terahertz radiation, with its wide range absorption ability, has been studied thoroughly for numerous futuristic applications. The THz band straddling from 0.1 to 10 THz has also eye-catching usability in the field of life sciences, material characterizations, industrial applications, security, etc. Owing to such miscellany use, cost-effectiveness and low-weight THz integrated circuits are of being high technological demand in present global scenario. Carbon-based graphene nanotubes, etc., have been established for those applications. Recently, rutile phase of titania has also attracted huge interest in the area of metamaterials which are considered as good terahertz absorber and open ups new potential application opportunity for TiO2 nanomaterial. This chapter focusses on one of the recently discovered promising material rutile phases of TiO2, which can be potentially used for terahertz applications. The study highlights on effect of Sb and Bi doping on refractive index of rutile TiO2 clusters considering density functional theory.