Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 33, Pages 13852-13858Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202003820
Keywords
directional couplers; flexible crystals; mechanophotonics; optical waveguides; organic photonics
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Funding
- SERB-New Delhi [CRG-2018/001551, CRG/2018/002784]
- DST, India [DST/SJF/CSA02/201415]
- IISER Kolkata
- DST-INSPIRE
- DST-New Delhi [INT/RUS/RSF/P-05]
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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 2x2-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.
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