Intra-particle plasmonic coupling of tip and cavity resonance modes in metallic apertured nanocavities

Jaeyoun Kim, Gang L. Liu, Yu Lu, Luke P. Lee

Research output: Contribution to journalArticle

Abstract

Based on numerical studies of apertured metallic nanocavity structures, we describe a new intra-particle plasmonic interaction pathway that couples the plasmon resonance modes of the aperture edge and the cavity. In contrast to the inter-particle coupling schemes that require precisely arrayed nanoparticles, this intra-particle coupling scheme achieves the tunability in plasmonic resonance wavelength using a single standalone nanostructure. In addition, when the aperture edge is made sharp, it functions dually as a tip that amplifies its near-field producing the local filed enhancement effect. We investigate the details of the coupling mechanism and identify the dominant role of the tip mode in determining the coupling efficiency numerically. The numerical model results in good agreement with recent experimental results. This intra-particle coupling mechanism will help the monolithic integration of plasmonic functionalities and its application for the nanoscale spectroscopy of biological structures in vivo.

Original languageEnglish (US)
Pages (from-to)8332-8338
Number of pages7
JournalOptics Express
Volume13
Issue number21
DOIs
StatePublished - Oct 17 2005

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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