Hybrid Ni/SiO2/Au dimer arrays for high-resolution refractive index sensing

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Hybrid Ni/SiO2/Au dimer arrays for high-resolution refractive index sensing. / Pourjamal, Sara; Kataja, Mikko; Maccaferri, Nicolò; Vavassori, Paolo; Van Dijken, Sebastiaan.

In: Nanophotonics, Vol. 7, No. 5, 05.2018, p. 905-912.

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Pourjamal, Sara ; Kataja, Mikko ; Maccaferri, Nicolò ; Vavassori, Paolo ; Van Dijken, Sebastiaan. / Hybrid Ni/SiO2/Au dimer arrays for high-resolution refractive index sensing. In: Nanophotonics. 2018 ; Vol. 7, No. 5. pp. 905-912.

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@article{f92c540361aa4d03b551c2cc4ec19575,
title = "Hybrid Ni/SiO2/Au dimer arrays for high-resolution refractive index sensing",
abstract = "We introduce a novel magnetoplasmonic sensor concept for sensitive detection of refractive index changes. The sensor consists of a periodic array of Ni/SiO2/Au dimer nanodisks. Combined effects of near-field interactions between the Ni and Au disks within the individual dimers and far-field diffractive coupling between the dimers of the array produce narrow linewidth features in the magneto-optical Faraday spectrum. We associate these features with the excitation of surface lattice resonances and show that they exhibit a spectral shift when the refractive index of the surrounding environment is varied. Because the resonances are sharp, refractive index changes are accurately detected by tracking the wavelength where the Faraday signal crosses 0. Compared to random distributions of pure Ni nanodisks or Ni/SiO2/Au dimers or periodic arrays of Ni nanodisks, the sensing figure of merit of the hybrid magnetoplasmonic array is more than one order of magnitude larger.",
keywords = "biosensing, magnetic nanoparticle array, magneto-optics, magnetoplasmonics",
author = "Sara Pourjamal and Mikko Kataja and Nicol{\`o} Maccaferri and Paolo Vavassori and {Van Dijken}, Sebastiaan",
year = "2018",
month = "5",
doi = "10.1515/nanoph-2018-0013",
language = "English",
volume = "7",
pages = "905--912",
journal = "Nanophotonics",
issn = "2192-8606",
number = "5",

}

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TY - JOUR

T1 - Hybrid Ni/SiO2/Au dimer arrays for high-resolution refractive index sensing

AU - Pourjamal, Sara

AU - Kataja, Mikko

AU - Maccaferri, Nicolò

AU - Vavassori, Paolo

AU - Van Dijken, Sebastiaan

PY - 2018/5

Y1 - 2018/5

N2 - We introduce a novel magnetoplasmonic sensor concept for sensitive detection of refractive index changes. The sensor consists of a periodic array of Ni/SiO2/Au dimer nanodisks. Combined effects of near-field interactions between the Ni and Au disks within the individual dimers and far-field diffractive coupling between the dimers of the array produce narrow linewidth features in the magneto-optical Faraday spectrum. We associate these features with the excitation of surface lattice resonances and show that they exhibit a spectral shift when the refractive index of the surrounding environment is varied. Because the resonances are sharp, refractive index changes are accurately detected by tracking the wavelength where the Faraday signal crosses 0. Compared to random distributions of pure Ni nanodisks or Ni/SiO2/Au dimers or periodic arrays of Ni nanodisks, the sensing figure of merit of the hybrid magnetoplasmonic array is more than one order of magnitude larger.

AB - We introduce a novel magnetoplasmonic sensor concept for sensitive detection of refractive index changes. The sensor consists of a periodic array of Ni/SiO2/Au dimer nanodisks. Combined effects of near-field interactions between the Ni and Au disks within the individual dimers and far-field diffractive coupling between the dimers of the array produce narrow linewidth features in the magneto-optical Faraday spectrum. We associate these features with the excitation of surface lattice resonances and show that they exhibit a spectral shift when the refractive index of the surrounding environment is varied. Because the resonances are sharp, refractive index changes are accurately detected by tracking the wavelength where the Faraday signal crosses 0. Compared to random distributions of pure Ni nanodisks or Ni/SiO2/Au dimers or periodic arrays of Ni nanodisks, the sensing figure of merit of the hybrid magnetoplasmonic array is more than one order of magnitude larger.

KW - biosensing

KW - magnetic nanoparticle array

KW - magneto-optics

KW - magnetoplasmonics

UR - http://www.scopus.com/inward/record.url?scp=85047497269&partnerID=8YFLogxK

U2 - 10.1515/nanoph-2018-0013

DO - 10.1515/nanoph-2018-0013

M3 - Article

VL - 7

SP - 905

EP - 912

JO - Nanophotonics

JF - Nanophotonics

SN - 2192-8606

IS - 5

ER -

ID: 21773919