Free-standing optical gold bowtie nanoantenna with variable gap size for enhanced Raman spectroscopy

Nahla A. Hatab; Chun Hway Hsueh; Abigail L. Gaddis; Scott T. Retterer; Jia Han Li; Gyula Eres; Zhenyu Zhang; Baohua Gu

doi:10.1021/nl102963g

Free-standing optical gold bowtie nanoantenna with variable gap size for enhanced Raman spectroscopy

Nahla A. Hatab, Chun Hway Hsueh, Abigail L. Gaddis, Scott T. Retterer, Jia Han Li, Gyula Eres, Zhenyu Zhang, Baohua Gu

Research output: Contribution to journal › Article › peer-review

499 Scopus citations

Abstract

We describe plasmonic interactions in suspended gold bowtie nanoantenna leading to strong electromagnetic field (E) enhancements. Surface-enhanced Raman scattering (SERS) was used to demonstrate the performance of the nanoantenna. In addition to the well-known gap size dependence, up to 2 orders of magnitude additional enhancement is observed with elevated bowties. The overall behavior is described by a SERS enhancement factor exceeding 10¹¹ along with an anomalously weak power law dependence of E on the gap size in a range from 8 to 50 nm that is attributed to a plasmonic nanocavity effect occurring when the plasmonic interactions enter a strongly coupled regime.

Original language	English
Pages (from-to)	4952-4955
Number of pages	4
Journal	Nano Letters
Volume	10
Issue number	12
DOIs	https://doi.org/10.1021/nl102963g
State	Published - Dec 8 2010

Keywords

Electron beam lithography
FDTD simulation
collective photonic effect
optical nanoantenna
single molecule SERS

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10.1021/nl102963g

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title = "Free-standing optical gold bowtie nanoantenna with variable gap size for enhanced Raman spectroscopy",

abstract = "We describe plasmonic interactions in suspended gold bowtie nanoantenna leading to strong electromagnetic field (E) enhancements. Surface-enhanced Raman scattering (SERS) was used to demonstrate the performance of the nanoantenna. In addition to the well-known gap size dependence, up to 2 orders of magnitude additional enhancement is observed with elevated bowties. The overall behavior is described by a SERS enhancement factor exceeding 1011 along with an anomalously weak power law dependence of E on the gap size in a range from 8 to 50 nm that is attributed to a plasmonic nanocavity effect occurring when the plasmonic interactions enter a strongly coupled regime.",

keywords = "Electron beam lithography, FDTD simulation, collective photonic effect, optical nanoantenna, single molecule SERS",

author = "Hatab, {Nahla A.} and Hsueh, {Chun Hway} and Gaddis, {Abigail L.} and Retterer, {Scott T.} and Li, {Jia Han} and Gyula Eres and Zhenyu Zhang and Baohua Gu",

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TY - JOUR

T1 - Free-standing optical gold bowtie nanoantenna with variable gap size for enhanced Raman spectroscopy

AU - Hatab, Nahla A.

AU - Hsueh, Chun Hway

AU - Gaddis, Abigail L.

AU - Retterer, Scott T.

AU - Li, Jia Han

AU - Eres, Gyula

AU - Zhang, Zhenyu

AU - Gu, Baohua

PY - 2010/12/8

Y1 - 2010/12/8

N2 - We describe plasmonic interactions in suspended gold bowtie nanoantenna leading to strong electromagnetic field (E) enhancements. Surface-enhanced Raman scattering (SERS) was used to demonstrate the performance of the nanoantenna. In addition to the well-known gap size dependence, up to 2 orders of magnitude additional enhancement is observed with elevated bowties. The overall behavior is described by a SERS enhancement factor exceeding 1011 along with an anomalously weak power law dependence of E on the gap size in a range from 8 to 50 nm that is attributed to a plasmonic nanocavity effect occurring when the plasmonic interactions enter a strongly coupled regime.

AB - We describe plasmonic interactions in suspended gold bowtie nanoantenna leading to strong electromagnetic field (E) enhancements. Surface-enhanced Raman scattering (SERS) was used to demonstrate the performance of the nanoantenna. In addition to the well-known gap size dependence, up to 2 orders of magnitude additional enhancement is observed with elevated bowties. The overall behavior is described by a SERS enhancement factor exceeding 1011 along with an anomalously weak power law dependence of E on the gap size in a range from 8 to 50 nm that is attributed to a plasmonic nanocavity effect occurring when the plasmonic interactions enter a strongly coupled regime.

KW - Electron beam lithography

KW - FDTD simulation

KW - collective photonic effect

KW - optical nanoantenna

KW - single molecule SERS

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DO - 10.1021/nl102963g

M3 - Article

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VL - 10

SP - 4952

EP - 4955

JO - Nano Letters

JF - Nano Letters

IS - 12

ER -

Free-standing optical gold bowtie nanoantenna with variable gap size for enhanced Raman spectroscopy

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