Linear and non-linear response of lithographically defined plasmonic nanoantennas

K. Schraml, M. Kaniber, J. Bartl, G. Glashagen, A. Regler, T. Campbell, J. J. Finley

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

We present numerical studies, nano-fabrication and optical characterization of bowtie nanoantennas demonstrating their superior performance with respect to the electric field enhancement as compared to other Au nanoparticle shapes. For optimized parameters, we found mean intensity enhancement factors >2300× in the feed-gap of the antenna, decreasing to 1300 × when introducing a 5nm titanium adhesion layer. Using electron beam lithography we fabricated gold bowties on various substrates with feed-gaps and tip radii as small as 10 nm. In polarization resolved measurement we experimentally observed a blue shift of the surface plasmon resonance from 1.72 eV to 1.35 eV combined with a strong modification of the electric field enhancement in the feed-gap. Under excitation with a 100 fs pulsed laser source, we observed non-linear light emission arising from two-photon photoluminescence and second harmonic generation from the gold. The bowtie nanoantenna shows a high potential for outstanding conversion efficiencies and the enhancement of other optical effects which could be exploited in future nanophotonic devices.

Original languageEnglish
Title of host publicationPhotonic and Phononic Properties of Engineered Nanostructures V
EditorsAxel Scherer, Ali Adibi, Shawn-Yu Lin
PublisherSPIE
ISBN (Electronic)9781628414615
DOIs
StatePublished - 2015
Externally publishedYes
EventPhotonic and Phononic Properties of Engineered Nanostructures V - San Francisco, United States
Duration: 9 Feb 201512 Feb 2015

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9371
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferencePhotonic and Phononic Properties of Engineered Nanostructures V
Country/TerritoryUnited States
CitySan Francisco
Period9/02/1512/02/15

Bibliographical note

Publisher Copyright:
© 2015 SPIE.

Keywords

  • bowtie
  • electric field enhancement
  • nanoantenna
  • non-linear optics
  • surface plasmon

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