Bifacial Metasurface with Quadrupole Optical Response

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • University of Cologne
  • Max Planck Institute for Solid State Research
  • University of Stuttgart

Abstract

We design, fabricate, and characterize a metasurface, whose multipole optical response depends significantly on the illumination direction. The metasurface is composed of gold-nanodisc dimers embedded in glass. In spite of their nanoscale size, the dimers exhibit a dominating electric-current-quadrupole response in a wide range of wavelengths around 700 nm when illuminated from one side, and a primarily electric-dipole response when illuminated from the opposite side. This leads to two consequences. First, the reflection coefficient of the metasurface considerably differs for the two sides of illumination. Second, quadrupole excitation results in a significant local enhancement of both electric and magnetic fields around the dimers. Our experimental spectroscopic data are in good agreement with simulations obtained using a multipole expansion model.

Details

Original languageEnglish
Article number024019
Pages (from-to)1-6
Number of pages6
JournalPhysical Review Applied
Volume4
Issue number2
Publication statusPublished - Aug 2015
MoE publication typeA1 Journal article-refereed

    Research areas

  • asymmetric reflectivity, electromagnetic multipoles, optical metasurface

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