Nonlinear Active Materials: An Illustration of Controllable Phase Matchability

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• 作者：Hongcheng Lu ; Romain Gautier ; Martin D. Donakowski ; T.Thao Tran ; Bryce W. Edwards ; Juan C. Nino ; P. Shiv Halasyamani ; Zhengtang Liu ; Kenneth R. Poeppelmeier
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：August 14, 2013
• 年：2013
• 卷：135
• 期：32
• 页码：11942-11950
• 全文大小：436K
• 年卷期：v.135,no.32(August 14, 2013)
• ISSN：1520-5126

文摘

For a crystal to exhibit nonlinear optical (NLO) activity such as second-harmonic generation (SHG), it must belong to a noncentrosymmetric (NCS) space group. Moreover, for these nonlinear optical (NLO) materials to be suitable for practical uses, the synthesized crystals should be phase-matchable (PM). Previous synthetic research into SHG-active crystals has centered on (i) how to create NCS compounds and/or (ii) how to obtain NCS compounds with high SHG efficiencies. With these tactics, one can synthesize a material with a high SHG efficiency, but the material could be unusable if the material was nonphase-matchable (non-PM). To probe the origin of phase matchability of NCS structures, we present two new chemically similar hybrid compounds within one composition space: (I) [Hdpa]₂NbOF₅路2H₂O and (II) HdpaNbOF₄ (dpa = 2,2鈥?dipyridylamine). Both compounds are NCS and chemically similar, but (I) is non-PM while (II) is PM. Our results indicate鈥攃onsistent with organic crystallography鈥攖he arrangement of the organic molecule within hybrid materials dictates whether the material is PM or non-PM.