Journal
SMALL STRUCTURES
Volume 3, Issue 2, Pages -Publisher
WILEY
DOI: 10.1002/sstr.202100163
Keywords
atomic force microscopy; flexible crystals; flexible optical waveguides; mechanophotonics; organic photonic integrated circuits
Funding
- SERB [CRG-2018/001551]
- UoH-IoE [MHRD] [F11/9/2019-U3(A)]
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Fabrication of organic photonic integrated circuits relies on highly flexible and fluorescent crystalline materials, as well as complex circuit architectures. The IPIN crystal exhibits high mechanical flexibility, bright green fluorescence, and selective self-absorbance of blue light, enabling effective fluorescence conversion. A multi-functional OPIC created using mechano(crystal)photonic approach delivers position-dependent and direction-specific optical signals.
Fabrication of organic photonic integrated circuits (OPICs) greatly relies on crystalline materials with high mechanical flexibility and fluorescence (FL). Realizing an efficient OPIC with multiple photonic functions suitable for practical applications depends on creating complex circuit architectures. The mechanical and optical functions of crystals are susceptible to subtle differences in the molecular packing and, more importantly, the type of intermolecular interactions. Herein, an organic crystal (E)-1-(4-(iodo)phenyl)iminomethyl-2-hydroxyl-naphthalene (IPIN) exhibiting high flexibility under mechanical stress, bright green FL, and selective self-absorbance of the blue part of its broadband FL signal is reported. IPIN microcrystal transduces its FL effectively even in its bent geometry. The significant crystal-surface adhesion energy facilitates the micromechanical fabrication of a triply-bent waveguide using a mechano(crystal)photonic approach, which is later integrated with a singly-bent waveguide to create a unique OPIC. This futuristic OPIC delivers excitation position-dependent and direction-specific long-pass-filtered narrowband optical signals with different split ratios.
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