Plasmonics

, Volume 5, Issue 2, pp 161–167

The Optimal Aspect Ratio of Gold Nanorods for Plasmonic Bio-sensing

  • Jan Becker
  • Andreas Trügler
  • Arpad Jakab
  • Ulrich Hohenester
  • Carsten Sönnichsen
Article

DOI: 10.1007/s11468-010-9130-2

Cite this article as:
Becker, J., Trügler, A., Jakab, A. et al. Plasmonics (2010) 5: 161. doi:10.1007/s11468-010-9130-2
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Abstract

The plasmon resonance of metal nanoparticles shifts upon refractive index changes of the surrounding medium through the binding of analytes. The use of this principle allows one to build ultra-small plasmon sensors that can detect analytes (e.g., biomolecules) in volumes down to attoliters. We use simulations based on the boundary element method to determine the sensitivity of gold nanorods of various aspect ratios for plasmonic sensors and find values between 3 and 4 to be optimal. Experiments on single particles confirm these theoretical results. We are able to explain the optimum by showing a corresponding maximum for the quality factor of the plasmon resonance.

Keywords

PlasmonSensorsNanorodsBEMSpectroscopyNanoparticlesNanocrystalsGold

Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Jan Becker
    • 1
  • Andreas Trügler
    • 2
  • Arpad Jakab
    • 1
  • Ulrich Hohenester
    • 2
  • Carsten Sönnichsen
    • 1
  1. 1.Institute of Physical ChemistryUniversity of MainzMainzGermany
  2. 2.Institute of PhysicsKarl-Franzens University GrazGrazAustria