Toward broadband plasmonics: Tuning dispersion in rhombic plasmonic crystals

Wei Zhou, Hanwei Gao, Teri W. Odom

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The angle-dependent optical properties of rhombic plasmonic crystals are described. We show that by extending the capabilities of soft interference lithography, subwavelength periodic patterns with arbitrary 2D Bravais lattices can be generated. In addition, we demonstrate that by lowering the plasmonic crystal lattice symmetry, degenerate conditions can be lifted and more plasmon bands can be excited within a fixed wavelength range. Degeneracies were also removed by changing the polar and azimuthal angles of excitation and visualized in dispersion diagrams. Anticrossings between different plasmon bands were observed to depend significantly on the local refractive index and the excitation direction.

Original languageEnglish
Pages (from-to)1241-1247
Number of pages7
JournalACS nano
Volume4
Issue number2
DOIs
Publication statusPublished - Feb 23 2010

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Keywords

  • Anticrossings
  • Band gaps
  • Dispersion diagram
  • Plasmonic crystal
  • Rhombic lattice

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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