Topography-induced variations of localized surface plasmon resonance in tip-enhanced Raman configuration

Azza Hadj Youssef (1) , Jiawei Zhang (1) , Andreas Dörfler (1) , Gitanjali Kolhatkar (2) , Alexandre Merlen (3) , Andreas Ruediger (1)

1 INRS - Institut National de la Recherche Scientifique [Québec]
2 CAU - Christian-Albrechts-Universität zu Kiel = Christian-Albrechts University of Kiel = Université Christian-Albrechts de Kiel
3 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence

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.

Domaines: Matière Condensée [cond-mat]; Science des matériaux [cond-mat.mtrl-sci]

Azza Hadj Youssef, Jiawei Zhang, Andreas Dörfler, Gitanjali Kolhatkar, Alexandre Merlen, et al.. Topography-induced variations of localized surface plasmon resonance in tip-enhanced Raman configuration. Optics Express, 2020, 28 (9), pp.14161. ⟨10.1364/OE.389565⟩. ⟨hal-02934942⟩