Realizing a point-like cavity and its efficient coupling

Myung Ki Kim, Hongchul Sim, Seung Ju Yoon, Yong Hee Lee

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


Confining photons in the smallest possible volume has long been the theme of the nanophotonics community. In this study, we suggest two types of point-like cavities: 1) 3D nano-diabolo metallic cavities and 2) plasmonic crystal point-like cavities, which both extremely squeeze photons in a 3D fashion with mode volumes of < 10-6 λ3 and intensity enhancements of >105. The former confines photons as forming the three-dimensionally tapered sub-5-nm air-gaps at the center of complementary nano-diabolo structures and the latter as tapering the metal-insulator-metal plasmonic crystal cavities along all three dimensions. Especially, the plasmonic crystal point-like cavities could couple to the integrated waveguides with over 90% efficiency by optimally selecting the number of air-holes in the plasmonic crystals. Based on the theoretical study, we fabricated the 3D nano-diabolo metallic cavity with a minimum gap size of 4 nm using the proximal milling technique, and the plasmonic crystal point-like cavity with the integrated waveguide using the electron-beam ion-deposition and focused ion-beam milling techniques. We strongly believe that our proposed point-like cavities could open a new research theme based on 3D nano-metallic structures, providing both extreme photon density and efficient coupling.

Original languageEnglish
Title of host publicationICTON 2015 - 17th International Conference on Transparent Optical Networks
EditorsMarek Jaworski, Marian Marciniak
PublisherIEEE Computer Society
ISBN (Electronic)9781467378802
Publication statusPublished - 2015 Aug 12
Externally publishedYes
Event17th International Conference on Transparent Optical Networks, ICTON 2015 - Budapest, Hungary
Duration: 2015 Jul 52015 Jul 9

Publication series

NameInternational Conference on Transparent Optical Networks
ISSN (Electronic)2162-7339


Conference17th International Conference on Transparent Optical Networks, ICTON 2015


  • Nano-optics
  • Nanofabrications
  • Plasmonic crystals
  • Plasmonics
  • Point-like cavities

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials


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