Thermooptic Property of Polycrystalline BiFeO<sub>3</sub> Film
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概要
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We have fabricated a polycrystalline BiFeO<sub>3</sub> (BFO) film with a thickness of 650 nm on a Pt/Ti/SiO<sub>2</sub>/Si substrate by a chemical solution deposition method, and its optical and thermooptic properties were evaluated by spectroscopic ellipsometry. The optical band gap energy of the BFO film was 2.95 eV at 50 °C and monotonically decreased with increasing temperature to 2.79 eV at 530 °C. The extinction coefficient was significantly low at a wavelength longer than 600 nm in the temperature range from 50 to 530 °C. The refractive index of the BFO film was estimated to be 2.96 at 600 nm and 2.68 at 1550 nm at 50 °C using a single Gaussian oscillator, and a thermooptic coefficient of $0.8\times 10^{-4}$ K-1 was obtained at a wavelength of 1550 nm. Although the refractive index decreased with increasing temperature at all wavelengths, the variation was larger at shorter wavelengths. This seems to be caused by the combination of broadening in the Gaussian oscillator vibration and thermal expansion.
- 2011-09-25
著者
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Okamura Soichiro
Department Of Applied Physics Faculty Of Science Science University Of Tokyo
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Nishida Ken
Department Of Electronic And Photonic Systems Engineering Kochi University Of Technology
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SHIMA Hiromi
Department of Applied Physics, Faculty of Science, Tokyo University of Science
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SUZUKI Michio
J. A. Woollam Japan Corporation
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Naganuma Hiroshi
Department Of Applied Physics Faculty Of Science Tokyo University Of Science
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Nakajima Takashi
Department Network And Computer Engineering School Of Information And Design Engineering Tokai Unive
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TADOKORO Toshiyasu
Techno Synergy Inc.
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Iijima Takashi
Research Center For Hydrogen Industrial Use And Storage National Institute Of Advanced Industrial Sc
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Tsutsumi Koichi
J. A. Woollam Japan
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Yamamoto Takashi
Department Of Applied Chemistry Faculty Of Engineering Ehime University
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Naganuma Hiroshi
Department of Applied Physics, Tohoku University, Sendai 980-8579, Japan
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Tsutsumi Koichi
J. A. Woollam Japan, Suginami, Tokyo 167-0051, Japan
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Tadokoro Toshiyasu
Techno-Synergy, Inc., Hachioji, Tokyo 193-0832, Japan
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Nakajima Takashi
Department of Applied Physics, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan
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Suzuki Michio
J. A. Woollam Japan Co., Fuji Building 2F, 5-22-9 Ogikubo, Suginami-ku, Tokyo 167-0051, Japan
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Suzuki Michio
J. A. Woollam Japan, Suginami, Tokyo 167-0051, Japan
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Nishida Ken
Department of Communicating Engineering, National Defense Academy, Yokosuka, Kanagawa 239-8686, Japan
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Iijima Takashi
Research Center for Hydrogen Industrial Use and Storage, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan
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