Design of high Q-factor metallic nanocavities using plasmonic bandgaps

Ho Seok Ee, Hong Kyu Park, Sun Kyung Kim

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6 Citations (Scopus)

Abstract

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
Volume55
Issue number5
DOIs
Publication statusPublished - 2016 Feb 10

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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