Annadhasan Mari, Agrawal Abhijeet R, Bhunia Surojit, Pradeep Vuppu Vinay, Zade Sanjio S, Reddy C Malla, Chandrasekar Rajadurai
Functional Molecular Nano/Micro Solids Laboratory, School of Chemistry, University of Hyderabad, Prof. C. R. Rao Road, Gachibowli, Hyderabad, 500 046, Telangana, India.
Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER), Kolkata, Mohanpur, West Bengal, 741246, India.
Angew Chem Int Ed Engl. 2020 Aug 10;59(33):13852-13858. doi: 10.1002/anie.202003820. Epub 2020 Jun 8.
We present the one-dimensional optical-waveguiding crystal dithieno[3,2-a:2',3'-c]phenazine with a high aspect ratio, high mechanical flexibility, and selective self-absorbance of the blue part of its fluorescence (FL). While macrocrystals exhibit elasticity, microcrystals deposited at a glass surface behave more like plastic crystals due to significant surface adherence, making them suitable for constructing photonic circuits via micromechanical operation with an atomic-force-microscopy cantilever tip. The flexible crystalline waveguides display optical-path-dependent FL signals at the output termini in both straight and bent configurations, making them appropriate for wavelength-division multiplexing technologies. A reconfigurable 2×2-directional coupler fabricated via micromanipulation by combining two arc-shaped crystals splits the optical signal via evanescent coupling and delivers the signals at two output terminals with different splitting ratios. The presented mechanical micromanipulation technique could also be effectively extended to other flexible crystals.
我们展示了一种具有高纵横比、高机械柔韧性以及对其荧光（FL）蓝色部分有选择性自吸收特性的一维光波导晶体二噻吩并[3,2 - a:2',3' - c]吩嗪。虽然大晶体表现出弹性，但沉积在玻璃表面的微晶由于显著的表面附着力，其行为更像塑性晶体，这使得它们适合通过原子力显微镜悬臂尖端进行微机械操作来构建光子电路。这种柔性晶体波导在直线和弯曲配置下的输出端均显示出与光路相关的FL信号，使其适用于波分复用技术。通过微操作将两个弧形晶体组合制成的可重构2×2定向耦合器，通过倏逝耦合来分离光信号，并在两个输出端以不同的分光比传输信号。所展示的机械微操作技术也可以有效地扩展到其他柔性晶体。
