Dependence of Apertureless Scanning Near-Field Spectroscopy on Nanoscale Refractive Index Changes

Dependence of Apertureless Scanning Near-Field Spectroscopy on Nanoscale Refractive Index Changes

We numerically investigate the spectral dependence of the electric field enhancement on a gold tip above PbTiO 3 on platinum systems by means of a finite element approach. The localized surface plasmon resonance (LSPR) is verified to change with the incident angle, the tip radius, and the tip-sample...

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Veröffentlicht in:Plasmonics (Norwell, Mass.) Mass.), 2018-02, Vol.13 (1), p.99-106
Hauptverfasser: Dab, Chahinez, Kolhatkar, Gitanjali, Plathier, Julien, Thomas, Reji, Ruediger, Andreas
Format: Artikel
Sprache:eng
Schlagworte:
Biochemistry
Biological and Medical Physics
Biophysics
Biotechnology
Chemistry
Chemistry and Materials Science
Ferroelectric materials
Ferroelectricity
Finite element method
Gold
Mathematical analysis
Nanotechnology
Platinum
Refractivity
Spectrum analysis
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Beschreibung
Zusammenfassung:We numerically investigate the spectral dependence of the electric field enhancement on a gold tip above PbTiO 3 on platinum systems by means of a finite element approach. The localized surface plasmon resonance (LSPR) is verified to change with the incident angle, the tip radius, and the tip-sample distance as well as with the refractive index of the sample underneath the tip. The refractive index sensitivity reveals detectable variations of the LSPR peak’s wavelength and maximum field enhancement, respectively, large enough to discriminate, e.g., between ferroelectric and paraelectric PbTiO 3 in tip-enhanced Raman spectroscopy (TERS) configuration.
ISSN:1557-1955
1557-1963
DOI:10.1007/s11468-016-0488-7