一种新的可用于太赫兹辐射源的晶体C23H15NO2的生长、形貌调控及性能研究

C23H26N2O3S (DAST), C25H30N2O3S (DSTMS), and C19H18N2O (OH1) are three representative crystals which can achieve ultra-wide THz radiation output based on nonlinear optics, however, their shortcomings such as absorption in the working region, poor environmental stability and mechanical property limit the practical applications. C23H15NO2 (PFI) is applicant’s new found nonlinear optical crystal, which has potential for terahertz wave generation. It exhibits large energy band gap, high environmental stability, and NLO effect that comparable large with benchmark crystal OH1. However, large size crystal growth and performance evaluation have not been fully researched. This project is to explore the relationship between PFI crystal growth habit and solvent properties. Optimum growth system and process parameters, and PFI crystals with large size and high quality will be obtained. Then to measure PFI’s optical properties, develop the prototype device, and respectively achieve the broadband, as well as tunable monochromic terahertz wave generation. The implementation of this project is helpful to the development of new nonlinear optical organic crystals and nonlinear optical technology in the field of terahertz wave generation.

DAST、DSTMS和OH1是目前基于非线性光学技术可实现超宽太赫兹辐射输出的三种代表性晶体，但因其工作区域吸收、环境稳定性及物理机械性能欠佳等缺憾还难以满足实际应用需求。异噁唑酮体系化合物C23H15NO2(PFI)是申请人新近发现的具有优秀物化性质的非线性光学晶体，表现出与OH1(d33=120pm/V, 1.9μm)相当的粉末倍频效应、更宽的带隙(2.57eV)和更高的热稳定性(235℃)，但大尺寸高质量的PFI单晶生长和性能评估工作尚未全面展开。本项目拟通过探索PFI晶体生长习性与溶剂性质的关系，寻找最优的生长体系和工艺参数，制备大尺寸高质量单晶，测量PFI晶体的光学性质，研制原型器件，实现其在1-20THz频段的连续及单频可调谐太赫兹波输出，初步评估其在太赫兹波段的应用前景，这对探索太赫兹波段非线性光学晶体新材料、促进非线性光学技术在太赫兹波产生领域的发展具有重要意义。

宽波段覆盖的太赫兹波(1-10THz)在材料研究、环境监测、生物医学、空间探测、国防反恐等领域有广泛的应用前景。异噁唑酮体系PFI (C23H15NO2)是新近发现的一种优秀非线性光学晶体，表现出与OH1(d33=120pm/V, 1.9μm)相当的粉末倍频效应、更宽的带隙(2.57eV)和更高的热稳定性(235℃)。本项目研究了PFI及其衍生物体系晶体生长过程，围绕PFI改进分子结构和生长条件，获得了最大尺寸8×7×5mm3的高质量PFI衍生物单晶，研究了其基本光学、热学性质，进一步加工得到通光孔径3mm的晶体原型器件，并成功实现其1-11THz的有效太赫兹波输出，相比同体系已报道太赫兹波输出的MLS晶体(C17H13NO3)，其在实验过程中表现出更优秀的抗激光损伤特性，证明了其潜在应用前景；同时，结合分子结构-性质关系的研究，合理设计合成并生长了几种新的兼具高稳定性和大粉末倍频效应的苯并噻唑体系、吲哚体系非线性光学晶体，且证实可产生单频宽调谐的太赫兹波输出，有望作为太赫兹辐射产生晶体的候选材料。以第一作者或通讯作者发表SCI论文6篇，申请专利4项，其中授权1项，协助培养研究生1名。

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