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

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

研究成果: Conference 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.

主出版物子標題Metallic Nanostructures and Their Optical Properties XIII
編輯Din Ping Tsai, Allan D. Boardman
出版狀態Published - 2015 1月 1
事件Plasmonics: Metallic Nanostructures and Their Optical Properties XIII - San Diego, United States
持續時間: 2015 8月 92015 8月 13


名字Proceedings of SPIE - The International Society for Optical Engineering


OtherPlasmonics: Metallic Nanostructures and Their Optical Properties XIII
國家/地區United States
城市San Diego

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學
  • 電腦科學應用
  • 應用數學
  • 電氣與電子工程


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