%0 Journal Article %K Thin films %K Light transmission %K Optical properties %K Absorption %K Spectroscopic ellipsometry %K Near-infrared %K Epitaxially grown %K Charge transfer %K Band gaps %K Absorption onset %K Blue-shifted %K Charge-transfer excitations %K Local symmetry %K Near-ultraviolet %K Optical transmission spectroscopy %K Structural strain %K Absorption spectroscopy %K Ion exchange %A P Chen %A N.J Podraza %A X.S Xu %A A Melville %A E Vlahos %A V Gopalan %A Ramamoorthy Ramesh %A D.G Schlom %A J.L Musfeldt %B Applied Physics Letters %D 2010 %G eng %R 10.1063/1.3364133 %T Optical properties of quasi-tetragonal BiFeO3 thin films %V 96