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

Jan Becker | Zendy; Andreas Trügler | Zendy; Árpád Jakab | Zendy; Ulrich Hohenester | Zendy; Carsten Sönnichsen | Zendy

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

Author(s) -

Jan Becker,

Andreas Trügler,

Árpád Jakab,

Ulrich Hohenester,

Carsten Sönnichsen

Publication year - 2010

Publication title -

plasmonics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.526

H-Index - 58

eISSN - 1557-1963

pISSN - 1557-1955

DOI - 10.1007/s11468-010-9130-2

Subject(s) - nanorod , plasmon , surface plasmon resonance , materials science , refractive index , aspect ratio (aeronautics) , analyte , resonance (particle physics) , biomolecule , localized surface plasmon , nanotechnology , sensitivity (control systems) , nanoparticle , optoelectronics , chemistry , physics , chromatography , particle physics , electronic engineering , engineering

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.

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