Spoorthi, K and Pramodini, S and Kityk, I V and Abd-Lefdil, M and Sekkati, M and Fakir, A El and Rao, Ashok and Sanjeev, Ganesh and Poornesh, P (2017) Investigations on nonlinear optical properties of electron beam treated Gd:ZnO thin !lms for photonic device applications. Laser Physics, 27 (6). pp. 65403-65408. ISSN 1555-6611

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Abstract

In this article, we report the third-order nonlinear optical properties of electron beam irradiated gadolinium-doped zinc oxide (GZO) thin !lms prepared using the spray pyrolysis deposition technique. GZO thin !lms were treated with an electron beam from a variable energy microtron accelerator at dose rates ranging from 1–5 kGy. Nonlinear optical measurements were conducted by employing the single beam Z-scan technique. A continuous wave He–Ne laser operating at 633 nm was used as the source of excitation. Closed aperture Z-scan results reveal that the !lms exhibit self-defocusing nonlinearity. Open aperture Z-scan results exhibit a switching over phenomena of reverse saturable absorption to saturable absorption for thin !lm irradiated at 3 kGy, indicating the in"uence of electron beams on optical nonlinearity. The signi!cant change in third-order nonlinear optical susceptibility c(3) ranging from 2.14 × 10−3 to 3.12 × 10−3 esu is attributed to the effect of electron beam irradiation. The study shows that the nonlinear coef!cients of GZO !lms can be tuned by electron beams for use in nonlinear optical device applications

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