Enhanced nanoplasmonic optical sensors with reduced substrate effect

Alexandre Dmitriev; Carl Hägglund; Si Chen; Hans Fredriksson; Tavakol Pakizeh; Mikael Käll; Duncan S Sutherland

doi:10.1021/nl8023142

Enhanced nanoplasmonic optical sensors with reduced substrate effect

Alexandre Dmitriev
, Carl Hägglund
, Si Chen
, Hans Fredriksson
, Tavakol Pakizeh
, Mikael Käll
, Duncan S Sutherland

Interdisciplinary Nanoscience Center

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

215 Citations (Scopus)

Abstract

We present a straightforward method to double the refractive index sensitivity of surface-supported nanoplasmonic optical sensors by lifting the metal nanoparticles above the substrate by a dielectric nanopillar. The role of the pillar is to substantially decrease the spatial overlap between the substrate and the enhanced fields generated at plasmon resonance. Data presented for nanodisks and nanoellipsoids supported by pillars of varying heights are found to be in excellent agreement with electrodynamics simulations. The described concepts apply to multitude of plasmonic nanostructures, fabricated by top-down or bottom-up techniques, and are likely to further facilitate the development of novel nanooptical sensors for biomedicine and diagnostics.

Original language	English
Journal	Nano Letters
Volume	8
Issue	11
Pages (from-to)	3893-8
Number of pages	6
ISSN	1530-6984
DOIs	https://doi.org/10.1021/nl8023142
Publication status	Published - 1 Nov 2008

Keywords

Microscopy, Electron, Scanning
Nanostructures
Sensitivity and Specificity
Silicon Dioxide
Surface Plasmon Resonance
Surface Properties

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title = "Enhanced nanoplasmonic optical sensors with reduced substrate effect",

abstract = "We present a straightforward method to double the refractive index sensitivity of surface-supported nanoplasmonic optical sensors by lifting the metal nanoparticles above the substrate by a dielectric nanopillar. The role of the pillar is to substantially decrease the spatial overlap between the substrate and the enhanced fields generated at plasmon resonance. Data presented for nanodisks and nanoellipsoids supported by pillars of varying heights are found to be in excellent agreement with electrodynamics simulations. The described concepts apply to multitude of plasmonic nanostructures, fabricated by top-down or bottom-up techniques, and are likely to further facilitate the development of novel nanooptical sensors for biomedicine and diagnostics.",

keywords = "Microscopy, Electron, Scanning, Nanostructures, Sensitivity and Specificity, Silicon Dioxide, Surface Plasmon Resonance, Surface Properties",

author = "Alexandre Dmitriev and Carl H{\"a}gglund and Si Chen and Hans Fredriksson and Tavakol Pakizeh and Mikael K{\"a}ll and Sutherland, \{Duncan S\}",

year = "2008",

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T1 - Enhanced nanoplasmonic optical sensors with reduced substrate effect

AU - Dmitriev, Alexandre

AU - Hägglund, Carl

AU - Chen, Si

AU - Fredriksson, Hans

AU - Pakizeh, Tavakol

AU - Käll, Mikael

AU - Sutherland, Duncan S

PY - 2008/11/1

Y1 - 2008/11/1

N2 - We present a straightforward method to double the refractive index sensitivity of surface-supported nanoplasmonic optical sensors by lifting the metal nanoparticles above the substrate by a dielectric nanopillar. The role of the pillar is to substantially decrease the spatial overlap between the substrate and the enhanced fields generated at plasmon resonance. Data presented for nanodisks and nanoellipsoids supported by pillars of varying heights are found to be in excellent agreement with electrodynamics simulations. The described concepts apply to multitude of plasmonic nanostructures, fabricated by top-down or bottom-up techniques, and are likely to further facilitate the development of novel nanooptical sensors for biomedicine and diagnostics.

AB - We present a straightforward method to double the refractive index sensitivity of surface-supported nanoplasmonic optical sensors by lifting the metal nanoparticles above the substrate by a dielectric nanopillar. The role of the pillar is to substantially decrease the spatial overlap between the substrate and the enhanced fields generated at plasmon resonance. Data presented for nanodisks and nanoellipsoids supported by pillars of varying heights are found to be in excellent agreement with electrodynamics simulations. The described concepts apply to multitude of plasmonic nanostructures, fabricated by top-down or bottom-up techniques, and are likely to further facilitate the development of novel nanooptical sensors for biomedicine and diagnostics.

KW - Microscopy, Electron, Scanning

KW - Nanostructures

KW - Sensitivity and Specificity

KW - Silicon Dioxide

KW - Surface Plasmon Resonance

KW - Surface Properties

U2 - 10.1021/nl8023142

DO - 10.1021/nl8023142

M3 - Journal article

C2 - 18844428

SN - 1530-6984

VL - 8

SP - 3893

EP - 3898

JO - Nano Letters

JF - Nano Letters

IS - 11

ER -

Enhanced nanoplasmonic optical sensors with reduced substrate effect

Abstract

Keywords

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