Composition dependence of the ultraviolet absorption edge in lithium tantalate films

Binwei Sun; Jun Gou; Jun Wang; Yadong Jiang

doi:10.1117/12.2509041

8 February 2019 Composition dependence of the ultraviolet absorption edge in lithium tantalate films

Binwei Sun, Jun Gou, Jun Wang, Yadong Jiang

Proceedings Volume 10843, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing and Imaging; 108431P (2019) https://doi.org/10.1117/12.2509041
Event: Ninth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT2018), 2018, Chengdu, China

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.

Citation Download Citation

Binwei Sun, Jun Gou, Jun Wang, and Yadong Jiang "Composition dependence of the ultraviolet absorption edge in lithium tantalate films", 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); https://doi.org/10.1117/12.2509041

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