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Mie-coupled bound guided states in nanowire geometric superlattices

Author

Listed:
  • Seokhyoung Kim

    (University of North Carolina-Chapel Hill)

  • Kyoung-Ho Kim

    (University of North Carolina-Chapel Hill
    Korea University)

  • David J. Hill

    (University of North Carolina-Chapel Hill)

  • Hong-Gyu Park

    (Korea University)

  • James F. Cahoon

    (University of North Carolina-Chapel Hill)

Abstract

All-optical operation holds promise as the future of computing technology, and key components include miniaturized waveguides (WGs) and couplers that control narrow bandwidths. Nanowires (NWs) offer an ideal platform for nanoscale WGs, but their utility has been limited by the lack of a comprehensive coupling scheme with band selectivity. Here, we introduce a NW geometric superlattice (GSL) that allows narrow-band guiding in Si NWs through coupling of a Mie resonance with a bound-guided state (BGS). Periodic diameter modulation creates a Mie-BGS-coupled excitation that manifests as a scattering dark state with a pronounced scattering dip in the Mie resonance. The frequency of the coupled mode, tunable from the visible to near-infrared, is determined by the pitch of the GSL. Using a combined GSL-WG system, we demonstrate spectrally selective guiding and optical switching and sensing at telecommunication wavelengths, highlighting the potential to use NW GSLs for the design of on-chip optical components.

Suggested Citation

  • Seokhyoung Kim & Kyoung-Ho Kim & David J. Hill & Hong-Gyu Park & James F. Cahoon, 2018. "Mie-coupled bound guided states in nanowire geometric superlattices," Nature Communications, Nature, vol. 9(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-05224-2
    DOI: 10.1038/s41467-018-05224-2
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