Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 11, Pages 4456-4463Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201913441
Keywords
anisotropic optical waveguides; co-crystals; polymorphs; transition dipole moment; two-dimensional photonics
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Funding
- National Natural Science Foundation of China [21703063, 21775040, 21775041]
- Ministry of Science and Technology of China [2017YFA0204502]
- Science and Technology Planning Project of Hunan Province [2018TP1017]
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2D anisotropic transport of photons/electrons is crucial for constructing ultracompact on-chip circuits. To date, the photons in organic 2D crystals usually exhibit the isotropic propagation, and the anisotropic behaviors have not yet been fully demonstrated. Now, an orientation-controlled photon-dipole interaction strategy was proposed to rationally realize the anisotropic and isotropic 2D photon transport in two co-crystal polymorph microplates. The monoclinic microplate adopts a nearly horizontal transition dipole moment (TDM) orientation in 2D plane, exhibiting anisotropic photon-dipole interactions and thus distinct re-absorption waveguide losses for different 2D directions. By contrast, the triclinic plate with a vertical TDM orientation, shows 2D isotropic photon-dipole interactions and thus the same re-absorption losses along different directions. Based on this anisotropy, a directional signal outcoupler was designed for the directional transmission of the real signals.
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