Journal
ADVANCED OPTICAL MATERIALS
Volume 11, Issue 13, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202201009
Keywords
flexible organic crystal waveguides; interferometer; mechanophotonics; organic fiber loop mirror; organic photonics
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The study demonstrates the design and synthesis of an extremely flexible organic crystal and its application in a novel interferometer. The crystal exhibits bending geometry-dependent optical properties, making it useful for manufacturing miniature photonics devices beyond traditional fabrication methods.
Organic crystals are poised to be a potential alternative to conventional silicon and its derivatives due to their utilization as microscale photonic components like active and passive waveguides, ring-resonators, modulators, directional couplers, add-on filters, interferometers (IMs), and reconfigurable circuits. Among these, IMs are important for flexible organic photonic integrated circuits. Here, the design and synthesis of extremely flexible (E)-1-(((5-bromopyridin-2-yl)imino)methyl)naphthalen-2-ol (BPyIN) crystals are demonstrated. The interactions stabilizing the crystal packing and crystal-substrate adhesion dictate the elasticity and pseudo-plasticity, respectively. The extremely flexible BPyIN crystals disclose bending geometry-dependent optical modes in the fluorescence spectra. This understanding is extended for fabricating a fiber loop mirror (FLM)-like geometry using a BPyIN single crystal. Mechanophotonics approach facilitates the integration of FLM-like crystal with a doubly bent waveguide to construct a first-of-its-kind IM. The light propagating path-length-dependent optical interference within the IM is established. These proof-of-principle experiments illustrate the usefulness of mechanophotonics to fabricate miniature photonic devices beyond the traditional fabrication approach.
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