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Photochemically Switchable Interconnected Microcavities for All‐Organic Optical Logic Gate
Author(s) -
Takeuchi Akihide,
Yamagishi Hiroshi,
Oki Osamu,
Morimoto Masakazu,
Irie Masahiro,
Yamamoto Yohei
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202103685
Subject(s) - materials science , optoelectronics , microfiber , optical fiber , whispering gallery wave , resonator , optics , physics , composite material
Abstract Optical microcavities confine molecular luminescence and transfer it to a far longer distance than the conventional Förster resonant energy transfer process. Such cavity‐mediated energy transfer is advantageous for use in optical circuitry. However, to realize all‐organic optical circuits, optical gate operation with organic materials is indispensable. Here, all‐organic optical gates consisting of polymer whispering gallery mode (WGM) resonators that work as the optical source, drain, and gate, which are interconnected with polymer microfiber, are demonstrated. Photoirradiation of the source sphere, as an optical input, triggers the blue fluorescence that transmits to the gate sphere through the fiber. The fiber interconnection enhances both the light confinement efficiency in the individual spheres and the light transmission efficiency between distant spheres. The gate sphere contains photoisomerizable fluorescent dye that converts, in its closed state, the blue emission into green light, which is again transmitted to the drain sphere through the fiber and lets the sphere emit red light as an output. This optical cascade is switched on and off upon photoisomerization of the dye in the gate sphere. Furthermore, an energy cascade equipped with two gate spheres works as an OR‐type logic gate, demonstrating potential utility for the future all‐organic and all‐optical integrated devices.

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