Design of high Q-factor metallic nanocavities using plasmonic bandgaps

Ho Seok Ee, Hong Gyu Park, Sun Kyung Kim

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The surface plasmon polariton modes often excited in metallic nanocavities enable the miniaturization of photonic devices, even beyond the diffraction limit, yet their severe optical losses deteriorate device performance. This study proposes a design of metallic nanorod cavities coupled to plasmonic crystals with the aim of reducing the radiation loss of surface plasmon modes. Periodic Ag disks placed on an insulator-metal substrate open a substantial amount of plasmonic bandgaps (e.g., Δλ =290 nm at λ =1550 nm) by modifying their diameter and thickness. When an Ag nanorod with a length of ∼400 nm is surrounded by the periodic Ag disks, its Q-factor increases up to 127, yielding a 16-fold enhancement compared with a bare Ag nanorod, while its mode volume can be as small as 0.03(λ2n)3. Ag nanorods with gradually increasing lengths exhibit high Q-factor plasmonic modes that are tunable within the plasmonic bandgap. These numerical studies on low-radiation-loss plasmonic modes excited in metallic nanocavities will promote the development of ultrasmall plasmonic devices.

Original languageEnglish
Pages (from-to)1029-1033
Number of pages5
JournalApplied optics
Issue number5
Publication statusPublished - 2016 Feb 10

Bibliographical note

Funding Information:
Basic Science Research Program; National Research Foundation of Korea (NRF) (NRF- 2013R1A1A1059423); Ministry of Science, ICT and Future Planning (MSIP) (No. 2009-0081565).

Publisher Copyright:
© 2016 Optical Society of America.

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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