Enhanced Fields in Mirror-Backed Low-Index Dielectric Structures

Xianyu Ao, Danqing Wang, Teri W. Odom

Research output: Contribution to journalArticle

Abstract

This Letter reports the localization of optical fields in dielectric nanopillar arrays on a metal film. Large-area arrays of tall (>450 nm) polymer pillars were patterned on an optically thick gold film by solvent-assisted nanoscale embossing. This hybrid dielectric-metal system supports two high-quality band-edge modes, with the mode at the wavelength closest to the array spacing concentrating electromagnetic field intensity at the tops of and extending beyond the nanopillars. Organic dye molecules mixed in the polymer matrix of the nanopillars showed enhanced radiative emission rates and narrow-band and unidirectional fluorescence emission. This hybrid platform offers prospects for strong near-field enhancements from low-index dielectric nanostructures.

Original languageEnglish
JournalACS Photonics
DOIs
Publication statusAccepted/In press - Jan 1 2019

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Keywords

  • fluorescence enhancement
  • hybrid metal-dielectric nanostructures
  • narrow band
  • soft nanoscale molding
  • surface mode

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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