Advanced Materials

Enhanced Light Focusing in Self-Assembled Optoplasmonic Clusters with Subwavelength Dimensions

Authors

  • Yan Hong,

    1. Department of Chemistry and The Photonics Center, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA
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  • Mahshid Pourmand,

    1. Department of Chemistry and The Photonics Center, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA
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  • Svetlana V. Boriskina,

    1. Department of Chemistry and The Photonics Center, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA
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  • Björn M. Reinhard

    Corresponding author
    1. Department of Chemistry and The Photonics Center, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA
    • Department of Chemistry and The Photonics Center, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA.
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Abstract

Compact metallo-dielectric hybrid clusters with subwavelength dimensions are fabricated by template guided self-assembly. Elastic and inelastic scattering spectroscopy and electromagnetic simulations reveal that hybrid clusters comprising TiO2 nanoparticles on top of a cluster of strongly coupled gold nanoparticles harness synergistic electromagnetic interactions between the building blocks. This results in a boost of the peak electric field intensity and a redistribution of the field in the ambient medium. The complex phase landscape in the clusters features optical vortices that enhance the magnetic field.

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