Extraordinary optical transmission through titanium nitride-coated microsphere lattice

Ana Maria M. Gherman, Alina Vladescu, Adrian E. Kiss, Cosmin Farcau

Research output: Contribution to journalArticle

Abstract

Titanium nitride (TiN), one candidate as an alternative plasmonic material, is deposited by the sputtering method on top of a self-assembled polystyrene microsphere lattice. The optical transmission spectra of the TiN-coated microsphere lattice reveal a transmission pass-band attributed to the extraordinary optical transmission phenomenon, known from subwavelength hole arrays in metal films. Simulations by finite element method show the presence of a hybrid mode resulting from coupling of surface plasmons on the TiN film to photonic guided resonance modes in the dielectric microsphere lattice. The crucial role of the microspheres in the transmission process is also evidenced by dedicated simulations. Such hybrid colloidal photonic-plasmonic crystals based on TiN are promising for future plasmonic applications requiring the thermo-mechanical stability of refractory ceramics complemented by a plasmonic efficiency similar to that of gold, but also for extending the range of current applications beyond the use of the classical noble metals gold and silver.

Original languageEnglish
Article number100762
JournalPhotonics and Nanostructures - Fundamentals and Applications
Volume38
DOIs
Publication statusPublished - Feb 2020

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Keywords

  • Colloidal self-assembly
  • Hybrid photonic-plasmonic crystals
  • Metal-coated microspheres
  • Surface plasmons
  • Titanium nitride

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Hardware and Architecture
  • Electrical and Electronic Engineering

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