Near-Field Mapping of Optical Modes on All-Dielectric Silicon Nanodisks

Terefe Getaneh Habteyes*, Isabelle Staude, Katie E. Chong, Jason Dominguez, Manuel Decker, Andrey Miroshnichenko, Yuri Kivshar, Igal Brener

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    68 Citations (Scopus)

    Abstract

    We measure, for the first time to our knowledge, the near-field amplitudes and phases of localized optical modes of high-index all-dielectric nanoparticles using apertureless near-field optical microscopy. For individual silicon nanodisks, we observe a four-lobed mode pattern and the formation of deep-subwavelength hot-spots. Our numerical calculations of the optical near-fields of the nanodisks in combination with a multipole expansion of the scattered field based on vector spherical harmonics reveal that the observed modes are dominated by electric quadrupole contributions. The observed mode is of particular interest for the design of low-loss all-dielectric metasurfaces and nanoantennas for a broad range of applications, such as directional and complex-polarization controlled emission, light extraction from multipolar atomic transitions, and coherent multiple-emitter-nanocavity interactions. (Figure Presented).

    Original languageEnglish
    Pages (from-to)794-798
    Number of pages5
    JournalACS Photonics
    Volume1
    Issue number9
    DOIs
    Publication statusPublished - 17 Sept 2014

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