Thickness Dependent Optical Properties of Sol-gel Based MgF2 – TiO2 Thin Films

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Authors: Siddarth Krishnaraja Achar, Akhil Punneri Madathil, Naveen C. S., Baijayanthi Gosh, A. R. Phani

ABSTRACT. MgF₂ – TiO₂ thin films were prepared by cost effective solgel technique onto glass substrates and optical parameters were determined by envelope technique. Thin films were characterized by optical transmission spectroscopy in the spectral range 290 – 1000 nm. The refractive index, extinction coefficient, Optical thickness and band gap dependency on thickness were evaluated. Thickness dependency of thin films showed direct allowed transition with band gap of 3.66 to 3.73 eV.

Keywords: envelope technique, thin films, optical parameters, sol-gel, band gap, dip-coating

DOI 10.2412/mmse.19.89.934

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