High order gap modes in film-coupled λ/10 nanoantennas

Chua Zu Huang, Ming Jing Wu, Shiuan-Yeh Chen

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A metal film coupled with a metal nanoparticle is a simple and stable nanoantenna structure with plasmonic characteristics. This film-coupled nanoparticle system also has potential for the signal enhancement due to the highly confined field between the film and the nanoparticle. Recently, this structure has been used to probe the limit of the enhanced field and the interaction with quantum emitters. The well-known mode in this nanoantenna structures is the gap dipole mode. However, the high order modes become significant when the gap between the nanoparticle and the film is reduced. In this work, the high order modes are investigated. The size of the whole nanoantenna structure is around λ/10. In experiments, the far field scattering spectra/images under different excitation and collection conditions indicate the influence and the existence of the high order modes. The calculated far-field scattering spectra and spatial intensity profiles have good agreement with the experimental results. In addition, among these high order modes, the simulated near-field distributions reveal distinguishable features which include the different symmetry of field distributions and the various size of confined field. The investigation of these high order modes may provide the information for designing the interaction between this nanoantenna structure and other plasmonic devices.

Original languageEnglish
Title of host publicationPlasmonics
Subtitle of host publicationMetallic Nanostructures and Their Optical Properties XIII
EditorsDin Ping Tsai, Allan D. Boardman
ISBN (Electronic)9781628417135
Publication statusPublished - 2015 Jan 1
EventPlasmonics: Metallic Nanostructures and Their Optical Properties XIII - San Diego, United States
Duration: 2015 Aug 92015 Aug 13

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherPlasmonics: Metallic Nanostructures and Their Optical Properties XIII
Country/TerritoryUnited States
CitySan Diego

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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