Optical Properties of BiFeO3-System Multiferroic Thin Films
Optical Properties of BiFeO3-System Multiferroic Thin Films
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BiFeO3 系多铁性薄膜的光学性质
DOI：
10.1143/jjap.48.09kb01
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
S. Okamura
中科院分区：
文献类型：
--
作者：
H. Shima;T. Kawae;A. Morimoto;M. Matsuda;Michio Suzuki;T. Tadokoro;H. Naganuma;T. Iijima;T. Nakajima;S. Okamura
用椭圆偏振光谱仪研究了化学溶液沉积(CSD)制备的BiFeO(BFO)薄膜和脉冲激光沉积(PLD)制备的(BiNFM)薄膜的光学性质，测定了它们的光学常数(n，k)和禁带宽度。在600 nm处，BFO和BNFM薄膜的折射率分别为3.22和2.87，但BFO薄膜存在折射率梯度。此外，在通常用于光通信的1550 nm波长下，BFO和BNFM薄膜的折射率分别为2.91和2.59。BFO和BNFM薄膜的禁带宽度分别为2.79 eV和2.72 eV，并且证实了这两种薄膜在600 nm以上波长的消光系数几乎为零。这些结果表明，BFO系多铁体薄膜具有作为高折射率光学材料的潜力。
The optical properties of the chemical solution deposition (CSD)-derived BiFeO3 (BFO) film and the pulsed laser deposition (PLD)-derived (Bi,Nd)(Fe,Mn)O3 (BNFM) film were evaluated by spectroscopic ellipsometry, and their optical constants (n, k) and band gaps were determined. At a wavelength of 600 nm, the refractive indexes of 3.22 and 2.87 were estimated for the BFO and BNFM films, respectively, although the existence of a refractive index gradient was suggested in the BFO film. In addition, at a wavelength of 1550 nm, which is generally used for optical communication, the refractive indexes of 2.91 and 2.59 were estimated for the BFO and BNFM films, respectively. The band gaps of the BFO and BNFM films were estimated to be 2.79 and 2.72 eV, respectively, and it was confirmed that the extinction coefficients of both films were almost zero at wavelengths larger than 600 nm. These results suggest that the BFO-system multiferroic films have a high potential as an optical material with a high refractive index.