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Issue 5, 2016
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Three dimensional sensitivity characterization of plasmonic nanorods for refractometric biosensors

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Abstract

An experimental three dimensional characterization of the local refractive index sensitivity of plasmonic gold nanorods is performed by controlled apposition of lithographic nanostructures. We show up to seven times higher sensitivity values to local changes in the refractive index at the particle tip than center. In addition, successive deposition of defined nm-thin dielectric layers on nanorods covered with stripe masks allows us to study the sensitivity decrease normal to the particle surface separately for different particle sites. Clear trends to a stronger sensitivity decay at sites of higher local sensitivity are demonstrated experimentally and theoretically. Our sensitivity characterization provides an important tool to find the most suitable particle type and particle site for specific bio-sensing applications.

Graphical abstract: Three dimensional sensitivity characterization of plasmonic nanorods for refractometric biosensors

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Article information


Submitted
16 Sep 2015
Accepted
29 Dec 2015
First published
30 Dec 2015

Nanoscale, 2016,8, 2974-2981
Article type
Paper
Author version available

Three dimensional sensitivity characterization of plasmonic nanorods for refractometric biosensors

V. Leitgeb, A. Trügler, S. Köstler, M. K. Krug, U. Hohenester, A. Hohenau, A. Leitner and J. R. Krenn, Nanoscale, 2016, 8, 2974
DOI: 10.1039/C5NR06401E

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