Near-field directive beams from passive and active asymmetric optical nanoantennas

Sawyer D. Campbell, Richard W Ziolkowski

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Core-shell, plasmonic-based nanoantennas have been shown to be resonant, resulting in extremely large enhancements of their scattered power. Nevertheless, they primarily radiate as electric dipoles due to their subwavelength sizes. We report how, through the introduction of asymmetry into these nanoantennas, it is possible to achieve highly directive optical beams in their near fields. In particular, we perforate the outer metallic coating of a core-shell nanoparticle and add gain material into its core region. It is demonstrated that this active holey-coated nanoparticle configuration effectively captures the incident field, amplifies it, and then channels this power into an intense near-field beam. The performance characteristics of these nanobeamers are compared to the nanojet behaviors experimentally realized with multimoded, electrically large dielectric particles. The intensities of the near-field power flow generated by these highly subwavelength nanobeamers are shown to be significantly larger than those produced by their multimode, micron-sized nanojet counterparts. Because of these enhanced field localization properties, a sensor array example is considered to demonstrate the efficacy of augmenting its detector elements with these nanobeamers.

Original languageEnglish (US)
Article number6872567
JournalIEEE Journal on Selected Topics in Quantum Electronics
Volume21
Issue number4
DOIs
StatePublished - Jul 1 2015

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near fields
Nanoparticles
Sensor arrays
nanoparticles
Detectors
Coatings
electric dipoles
asymmetry
coatings
augmentation
sensors
detectors
configurations
Nanoantennas

Keywords

  • Directive antennas
  • Electromagnetic scattering
  • Nanoantenna
  • Nanophotonics
  • Optical sensors
  • Plasmons

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics

Cite this

Near-field directive beams from passive and active asymmetric optical nanoantennas. / Campbell, Sawyer D.; Ziolkowski, Richard W.

In: IEEE Journal on Selected Topics in Quantum Electronics, Vol. 21, No. 4, 6872567, 01.07.2015.

Research output: Contribution to journalArticle

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