Designing a Deep-Ultraviolet Nonlinear Optical Material with a Large Second Harmonic Generation Response

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• 作者：Hongping Wu ; Hongwei Yu ; Zhihua Yang ; Xueling Hou ; Xin Su ; Shilie Pan ; Kenneth R. Poeppelmeier ; James M. Rondinelli
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：March 20, 2013
• 年：2013
• 卷：135
• 期：11
• 页码：4215-4218
• 全文大小：275K
• 年卷期：v.135,no.11(March 20, 2013)
• ISSN：1520-5126

文摘

The generation of intense coherent deep-UV light from nonlinear optical materials is crucial to applications ranging from semiconductor photolithography and laser micromachining to photochemical synthesis. However, few materials with large second harmonic generation (SHG) and a short UV-cutoff edge are effective down to 200 nm. A notable exception is KBe₂BO₃F₂, which is obtained from a solid-state reaction of highly toxic beryllium oxide powders. We designed and synthesized a benign polar material, Ba₄B₁₁O₂₀F, that satisfies these requirements and exhibits the largest SHG response in known borates containing neither lone-pair-active anions nor second-order Jahn鈥揟eller-active transition metals. We developed a microscopic model to explain the enhancement, which is unexpected on the basis of conventional anionic group theory arguments. Crystal engineering of atomic displacements along the polar axis, which are difficult to attribute to or identify within unique anionic moieties, and greater cation polarizabilities are critical to the design of next-generation SHG materials.