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Organic Nonlinear Optical Single-Crystalline Thin Film Grown by Physical Vapor Deposition for Terahertz Generation
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2018-06-01 00:00:00 , DOI: 10.1021/acs.cgd.8b00388 Hirohisa Uchida 1, 2 , Ryo Yamazaki 2 , Kengo Oota 2 , Koutarou Okimura 2 , Tsubasa Minami 2 , Kei Takeya 2 , Kodo Kawase 2
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2018-06-01 00:00:00 , DOI: 10.1021/acs.cgd.8b00388 Hirohisa Uchida 1, 2 , Ryo Yamazaki 2 , Kengo Oota 2 , Koutarou Okimura 2 , Tsubasa Minami 2 , Kei Takeya 2 , Kodo Kawase 2
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There are a number of advantages to terahertz (THz) waves by Cherenkov phase matching using a nonlinear optical (NLO) crystal; however, a thin crystal of micrometer-scale must be grown to satisfy the optimal phase matching conditions. Inorganic crystals with well-developed crystal growth and processing techniques have been widely used to date; however, THz wave generation with improved efficiency in the broadband region could be achieved with a single-crystalline thin film of an organic NLO material with a large NLO coefficient. Here, the growth of a crystalline thin film with a size of several microns using a very simple method is reported. Physical vapor deposition is used to grow a crystal of the organic nonlinear material 2-(3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene) malononitrile (OH1). This method is much simpler than the conventional crystal growth method. Additionally, the OH1 single-crystalline thin film grown by physical vapor deposition has a better crystalline character than a bulk OH1 crystal grown by the solution method. The OH1 single crystal grown by this technique demonstrates efficient THz wave generation and low absorption of THz waves by the crystal.
中文翻译：
物理气相沉积生长太赫兹的有机非线性光学单晶薄膜
通过使用非线性光学（NLO）晶体进行的Cherenkov相位匹配，太赫兹（THz）波具有许多优势。然而，必须生长微米级的薄晶体以满足最佳的相位匹配条件。迄今为止，具有成熟的晶体生长和加工技术的无机晶体已被广泛使用。然而，利用具有大的NLO系数的有机NLO材料的单晶薄膜可以实现在宽带区域中具有提高的效率的太赫兹波的产生。在此，报道了使用非常简单的方法来生长具有几微米大小的晶体薄膜。物理气相沉积用于生长有机非线性材料2-（3-（4-羟基苯乙烯基）-5,5-二甲基环己-2-烯基）丙二腈（OH1）的晶体。该方法比常规的晶体生长方法简单得多。另外，与通过溶液法生长的块状OH1晶体相比，通过物理气相沉积法生长的OH1单晶薄膜具有更好的结晶特性。通过这种技术生长的OH1单晶显示出有效的太赫兹波产生和晶体对太赫兹波的低吸收。
更新日期：2018-06-01
中文翻译：
物理气相沉积生长太赫兹的有机非线性光学单晶薄膜
通过使用非线性光学（NLO）晶体进行的Cherenkov相位匹配，太赫兹（THz）波具有许多优势。然而，必须生长微米级的薄晶体以满足最佳的相位匹配条件。迄今为止，具有成熟的晶体生长和加工技术的无机晶体已被广泛使用。然而，利用具有大的NLO系数的有机NLO材料的单晶薄膜可以实现在宽带区域中具有提高的效率的太赫兹波的产生。在此，报道了使用非常简单的方法来生长具有几微米大小的晶体薄膜。物理气相沉积用于生长有机非线性材料2-（3-（4-羟基苯乙烯基）-5,5-二甲基环己-2-烯基）丙二腈（OH1）的晶体。该方法比常规的晶体生长方法简单得多。另外，与通过溶液法生长的块状OH1晶体相比，通过物理气相沉积法生长的OH1单晶薄膜具有更好的结晶特性。通过这种技术生长的OH1单晶显示出有效的太赫兹波产生和晶体对太赫兹波的低吸收。
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