School of Chemistry and Centre for Nanotechnology, University of Hyderabad, Gachibowli, Hyderabad, 500 046, Telangana, India.
Department of Chemistry, Jadavpur University, Kolkata, 700032, India.
Angew Chem Int Ed Engl. 2023 Jun 19;62(25):e202302929. doi: 10.1002/anie.202302929. Epub 2023 May 8.
We demonstrate an innovative technique to achieve organic 2D and 3D waveguides with peculiar shapes from an acicular, stimuli-responsive molecular crystal, (2Z,2'Z)-3,3'-(anthracene-9,10-diyl)bis(2-(3,5-bis(trifluoromethyl)phenylacrylonitrile), Ant-CF . The greenish-yellow fluorescent (FL) Ant-CF molecular crystals exhibit laser power-dependent permanent mechanical bending in 2D and 3D. Investigation of a single-crystal using spatially-resolved Raman/FL/electron microscopy, and theoretical calculations revealed photothermal (Z,E)/(E,E) isomerization-assisted transition from crystalline to amorphous phase at the laser-exposed regions. This phenomenon facilitates the dimension engineering of a 1D crystal waveguide into 2D waveguide on a substrate or a 3D waveguide in free space. The bends can be used as interconnection points to couple different optical elements. The presented technique has broader implications in organic photonics and other crystal-related photonic technologies.
我们展示了一种创新的技术，可从针状、响应性分子晶体（2Z，2'Z）-3,3' - （蒽-9,10-二基）双（2-（3,5-二（三氟甲基）苯基）丙烯腈），Ant-CF 中获得具有奇特形状的有机二维和三维波导。绿色荧光（FL）Ant-CF 分子晶体在二维和三维方向上表现出激光功率依赖性的永久机械弯曲。使用空间分辨拉曼/FL/电子显微镜和理论计算对单晶进行研究，揭示了在激光照射区域，光热（Z，E）/（E，E）异构化辅助从晶相到非晶相的转变。这种现象促进了一维晶体波导在基底上的二维波导或自由空间中的三维波导的尺寸工程。这些弯曲可以用作连接点，以耦合不同的光学元件。所提出的技术在有机光子学和其他晶体相关光子技术中有更广泛的应用。
