Nanostructure-empowered efficient coupling of light into optical fibers at extraordinarily large 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: Contribution to journalArticlepeer-review

    28 Citations (Scopus)

    Abstract

    Coupling of light from free space to optical fibers is essential for many applications, while commonly used step-index optical fibers provide insufficient coupling efficiencies especially at large angles of incidence. Here, we demonstrate record-high coupling efficiencies achieved with dielectric nanostructures located on single-mode fiber end faces. We introduce a novel approach that allows fabricating dielectric nanostructures at the facet of a step-index optical fiber via an extended version of planar electron-beam based lithography. We demonstrate polarization- A nd angle-independent coupling of light into the fiber across a wide range of angles as large as 80°. We support our experimental results with an analytical model and extensive numerical simulations. Our results reveal the key properties of nanostructure-empowered fibers that may improve the performance of many optical devices requiring efficient collection of light, including quantum technologies (single-photon collection) or biophotonics (in vivo imaging). Our approach can be extended to other materials and geometries, merging fiber optics with high-index dielectric metasurfaces, allowing for unprecedented functionalities for the efficient control of light.

    Original languageEnglish
    Pages (from-to)2834-2841
    Number of pages8
    JournalACS Photonics
    Volume7
    Issue number10
    DOIs
    Publication statusPublished - 21 Oct 2020

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