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Composition dependence of the ultraviolet absorption edge in lithium tantalate films
Author(s): Binwei Sun; Jun Gou; Jun Wang; Yadong Jiang
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Paper Abstract

The structural and optical characteristics of nearly stoichiometric lithium tantalate films have been studied. The LiTaO3 films were prepared by RF magnetron sputtering method and the phase was confirmed by powder X-ray diffraction. The optical properties were obtained from optical transmittance spectroscopy in UV-vis.-NIR range. The electronic band gap structure were determined from the fundamental absorption edge in the UV region. The evolution of defect structures caused by varying composition and post-growth processing has been evaluated from the optical absorption measurements. Optical absorption studies showed that the UV absorption edge is very sensitive to the composition of LiTaO3 films. The absorption features in the UV range indicate the discrete nature of conduction band and the allowed energy levels in the forbidden gap appeared due to surface defects.

Paper Details

Date Published: 8 February 2019
PDF: 6 pages
Proc. SPIE 10843, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing and Imaging, 108431P (8 February 2019); doi: 10.1117/12.2509041
Show Author Affiliations
Binwei Sun, Univ. of Electronic Science and Technology of China (China)
Jun Gou, Univ. of Electronic Science and Technology of China (China)
Jun Wang, Univ. of Electronic Science and Technology of China (China)
Yadong Jiang, Univ. of Electronic Science and Technology of China (China)


Published in SPIE Proceedings Vol. 10843:
9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing and Imaging
Yadong Jiang; Xiaoliang Ma; Xiong Li; Mingbo Pu; Xue Feng; Bernard Kippelen, Editor(s)

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