Optical and conductive properties of Antimony-Bismuth co-doped titanium dioxide in terahertz range

• Published in: Infrared physics & technology Vol. 112; p. 103570
• Main Authors: Mumtaz, Muhammad, Ahsan Mahmood, M., Khan, Sabih D., Aslam Zia, M., Iqbal, Amjid, Ahmed, Mushtaq, Ahmad, Izhar
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-01-2021
• Subjects: Absorption coefficient; Co-doped; Conductivity; Refractive index; Terahertz; Titanium dioxide; Conductivity; Co-doped; Absorption coefficient; Terahertz; Titanium dioxide; Refractive index
• ISSN: 1350-4495; 1879-0275
• DOI: 10.1016/j.infrared.2020.103570

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•Study of optical properties of (Sb+Bi) co-doped titanium dioxide with THz-TDS.•A prominent tuning of these parameters has been observed with doping concentration.•The tuning of these parameters has been compared with Sb-doped and Bi-doped TiO2.•The Drude-Smith model fitting on THz conductivity describes its mechanism.•Plasma frequency and carrier scattering time have been extracted.
Fine tuning of optical and dielectric characteristics of titanium dioxide (TiO2), such as complex refractive index, optical conductivity, and dielectric function, have been demonstrated by doping, and co-doping of antimony and bismuth for applications in terahertz (THz) spectral frequency range. The characterization has been performed using X-ray diffraction, THz time-domain spectroscopy, and Effective-Medium Approximation theory. The results show an increasing trend in the measured parameters with frequency and dopant concentration. Moreover, the conductivity of the samples in THz range fulfills the Drude Smith model.