Record-breaking light coupling into nanostructured optical fibers under large incident angles

Oleh Yermakov*, Henrik Schneidewind, Uwe Hübner, Torsten Wieduwilt, Matthias Zeisberger, Andrey Bogdanov, Yuri Kivshar, Markus A. Schmidt*

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


    Coupling of light into optical fibers is important for many applications, while for commonly used step-index optical fibers it massively drops for oblique incident angles >15 degrees, limiting their operational range to a narrow angle interval. In this work, we address this issue via inclusion of dielectric concentric ring-type nanostructures located in the core region of commercially available step-index fibers. Modification of fiber facet with the optimized ring-like nanostructure leads to polarization- and azimuthally-independent enhancement of in-coupling efficiency across the entire angle interval from 15 to 85 degrees. We develop the analytical model and show the percent-level of light in-coupling efficiency even at angles as large as 70 degrees, addressing a domain that is out-of-reach for fibers with unstructured end faces. The main result of this work is the enhancement of the in-coupling efficiency at large incident angles (>30 degrees) by several orders of magnitude with respect to a bare fiber. The results obtained are promising for any application that demands to remotely collect light under large angles, such as in-vivo spectroscopy, biosensing or quantum technology.

    Original languageEnglish
    Title of host publicationMicro-structured and Specialty Optical Fibres VII
    EditorsKyriacos Kalli, Alexis Mendez, Pavel Peterka
    ISBN (Electronic)9781510643802
    Publication statusPublished - 2021
    EventMicro-structured and Specialty Optical Fibres VII 2021 - Virtual, Online, Czech Republic
    Duration: 19 Apr 202123 Apr 2021

    Publication series

    NameProceedings of SPIE - The International Society for Optical Engineering
    ISSN (Print)0277-786X
    ISSN (Electronic)1996-756X


    ConferenceMicro-structured and Specialty Optical Fibres VII 2021
    Country/TerritoryCzech Republic
    CityVirtual, Online


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