Experimental verification of substrate-induced bianisotropy in optical metamaterials

Seokho Yun, Zhi Hao Jiang, Ding Ma, Zhiwen Liu, Douglas H. Werner, Theresa S. Mayer

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

This paper reports on substrate-induced bianisotropy in an impedance-matched near-zero-index metallodielectric fishnet nanostructure with vertical sidewalls and a supporting substrate. The effect of bianisotropy on the metamaterial optical properties is confirmed through spectral holography measurements and full-wave electromagnetic simulations, showing asymmetric reflection coefficients from opposite sides of the structure at normal incidence. The non-zero magnetoelectric coupling parameter causes a 0.03 μm shift in the near-infrared zero-index band centered at 1.5 μm and a 38% reduction in transmitted power. The substrate-induced bianisotropy is due to the excitation of an anti-symmetric plasmonic resonance mode identified by comparing simulations of the current distributions on free-standing and substrate-mounted fishnet structures. This experimental demonstration of substrate-induced bianisotropy verifies the previously proposed theory and provides valuable guidance for future plasmonic and metamaterial nanostructures that include substrates.

Original languageEnglish (US)
Article number233109
JournalApplied Physics Letters
Volume103
Issue number23
DOIs
StatePublished - Dec 2 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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