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Effect of lanthanum doping on linear and nonlinear-optical properties of Bi3TiNbO9 thin films |
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| Authors: | Hengzhi ChenBin Yang Mingfu ZhangFeiyan Wang Kokwai CheahWenwu Cao |
| Affiliation: | a Center for Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, China b Center for Composite Materials, Harbin Institute of Technology, Harbin 150001, China c Department of Physics, Hong Kong Baptist University, Hong Kong SAR, China d Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA |
| Abstract: | Lanthanum doped Bi3TiNbO9 thin films (LBTN-x, La3+ contents x = 5%, 15%, 25% and 35 mol.%) with layered perovskite structure were fabricated on fused silica by pulsed laser deposition method. Their linear and nonlinear optical properties were studied by transmittance measurement and Z-Scan method. All films exhibit good transmittance (>55%) in visible region. For lanthanum doping content are x = 5%, 15% and 25 mol.%, the nonlinear absorption coefficient of LBTN-x thin films increases with the La3+ content, then it drops down at x = 35 mol.% when the content of La3+ in (Bi2O2)2+ layers is high enough to aggravate the orthorhombic distortion of the octahedra. We found that, 25 mol.% is the optimal La3+ content for LBTN-x thin films to have the largest nonlinear absorption coefficient making the LBTN-x film a promising candidate for absorbing-type optical device applications. |
| Keywords: | Nonlinear optical absorption Lanthanum doped Bi3TiNbO9 Pulsed laser deposition Optical constant |
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