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Giant Birefringence of Lithium Niobate Crystals in the Terahertz Region |
SUN Yi-Min1;MAO Zong-Liang2;HOU Bi-Hui2;LIU Guo-Qing2;WANG Li1 |
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1 Laboratory of Optical Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080
2 College of Applied Science, Beijing University of Technology,Beijing 100022 |
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| Cite this article: |
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SUN Yi-Min, MAO Zong-Liang, HOU Bi-Hui et al 2007 Chin. Phys. Lett. 24 414-417 |
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Abstract Terahertz time-domain spectroscopy (THz-TDS) is used to study the spectral response of lithium niobate crystals (LiNbO3) in the far infrared region. The optical constants are derived from the measured complex refractive index. A giant birefringence is observed in this material, and the average refractive-index difference between the ordinary wave and the extraordinary wave, no-ne, can reach up to about 1.6. Such a large birefringence is attributed to the different phonon modes of A1(z) and E(x,y). This unusual property makes LiNbO3 a promising material to be used as a functional material in the terahertz region, e.g. employed as wave-plates and polarization separators.
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42.25.Bs
42.25.Lc
78.20.Fm
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Received: 18 September 2006
Published: 24 February 2007
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