In this work, the effect of irradiation on the optical properties of Bi thin films was studied. The Bi films were deposited on glass substrates at room temperature by thermal evaporation technique with the thickness (0.6 μm) and rate of deposition equal to 6.66 ?/sec. The work had included studying some of the optical properties of Bi thin films before and after irradiation from Co-60 by ray doses (20) Mrad. Analyses performed on irradiated and unirradiated samples showed significant changes in transmittance, transmission spectra. After irradiation, the transmission spectra values increased whereas anisotropy detected in the transmission spectra of unirradiated samples disappeared. The change of color caused by irradiation was noticeable to the naked eye.The optical constants, which are represented by the extinction coefficient (k), and refractive index (n), were determined from the transmittance spectrum in the Near Infrared (2500-3900) nm regions. The value of the optical energy gap increased after irradiation for samples.
K. Hachim, F. and A. Gatea, H.
"A Study Effect of Irradiation on the Optical Properties of Bi Thin Films,"
International Journal of Thin Film Science and Technology: Vol. 12
, PP -.
Available at: https://digitalcommons.aaru.edu.jo/ijtfst/vol12/iss1/8