Plastically bendable organic crystals for monolithic and hybrid micro‐optical circuits

Jada Ravi, Torvid Feiler, Amit Mondal, Adam A. L. Michalchuk, C. Malla Reddy*, Biswajit Bhattacharya*, Franziska Emmerling*, Rajadurai Chandrasekar*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Fluorescent plastically bendable crystals are a promising alternative to silicon-based materials for fabricating photonic integrated circuits, owing to their optical attributes and mechanical compliance. Mechanically bendable plastic organic crystals are rare. Their formation requires anisotropic intermolecular interactions and slip planes in the crystal lattice. This work presents three fluorescent plastically bendable crystalline materials namely, 2-((E)-(6-methylpyridin-2-ylimino)methyl)-4-chlorophenol (SB1), 2-((E)-(6-methylpyridin-2-ylimino)methyl)-4-bromophenol (SB2), and 2-((E)-(6-Bromopyridin-2-ylimino)methyl)-4-bromophenol (SB3) molecules. The crystal plasticity in response to mechanical stress facilitates the fabrication of various monolithic and hybrid (with a tip-to-tip coupling) photonic circuits using mechanical micromanipulation with an atomic force microscope cantilever tip. These plastically bendable crystals act as active (self-guiding of fluorescence) and passive waveguides both in straight and extremely bent (U-, J-, and O-shaped) geometries. These microcircuits use active and passive waveguiding principles and reabsorbance and energy-transfer mechanisms for their operation, allowing input-selective and direction-specific signal transduction.
Original languageEnglish
Article number2201518
JournalAdvanced Optical Materials
Early online date20 Nov 2022
Publication statusE-pub ahead of print - 20 Nov 2022


  • circuits
  • mechanophotonics
  • organic photonics
  • plastic bendable crystals
  • waveguides


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