Highly tunable ultra-narrow-resonances with optical nano-antenna phased arrays in the infrared

Shi Qiang Li, Wei Zhou, Peijun Guo, D. Bruce Buchholz, Ziwei Qiu, John B. Ketterson, Leonidas E. Ocola, Kazuaki Sakoda, Robert P.H. Chang

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


We report our recent development in pursuing high Quality-Factor (high-Q factor) plasmonic resonances, with vertically aligned two dimensional (2-D) periodic nanorod arrays. The 2-D vertically aligned nano-antenna array can have high-Q resonances varying arbitrarily from near infrared to terahertz regime, as the antenna resonances of the nanorod are highly tunable through material properties, the length of the nanorod, and the orthogonal polarization direction with respect to the lattice surface,. The high-Q in combination with the small optical mode volume gives a very high Purcell factor, which could potentially be applied to various enhanced nonlinear photonics or optoelectronic devices. The 'hot spots' around the nanorods can be easily harvested as no index-matching is necessary. The resonances maintain their high-Q factor with the change of the environmental refractive index, which is of great interest for molecular sensing.

Original languageEnglish
Title of host publicationPlasmonics
Subtitle of host publicationMetallic Nanostructures and Their Optical Properties XII
EditorsAllan D. Boardman
ISBN (Electronic)9781628411904
Publication statusPublished - 2014
EventPlasmonics: Metallic Nanostructures and Their Optical Properties XII - San Diego, United States
Duration: Aug 17 2014Aug 21 2014

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 XII
CountryUnited States
CitySan Diego


  • Monopole optical antenna
  • Purcell factor
  • diffractive coupling
  • optical focusing

ASJC Scopus subject areas

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

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