Open AccessTopography-induced variations of localized surface plasmon resonance in tip-enhanced Raman configuration
Author(s) -
Azza Hadj Youssef,
Jiawei Zhang,
Andreas Dörfler,
Gitanjali Kolhatkar,
Alexandre Merlen,
Andréas Ruediger
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.389565
Subject(s) - materials science , surface plasmon resonance , optics , raman spectroscopy , refractive index , surface plasmon , raman scattering , plasmon , dielectric , resonance (particle physics) , near field scanning optical microscope , surface plasmon polariton , microscopy , optoelectronics , optical microscope , nanoparticle , scanning electron microscope , nanotechnology , physics , particle physics , composite material
We report on topography-induced changes of the localized surface plasmon resonance (LSPR) enhanced luminescence of gold tip on SrTiO 3 nanostructures with apertureless scanning near-field optical microscopy (aSNOM) in tip-enhanced Raman spectroscopy (TERS) configuration. Our experimental and simulated results indicate that the averaged refractive index of the dielectric environment of the tip apex containing both air and SrTiO 3 in variable volume ratios, is dependent on the topography of the sample. This reveals that the local topography has to be taken into consideration as an additional contribution to the position of the LSPR.