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

Abstract : 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.
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https://hal.archives-ouvertes.fr/hal-02934942
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Soumis le : mercredi 9 septembre 2020 - 18:59:27
Dernière modification le : mardi 6 octobre 2020 - 16:30:49

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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, Optical Society of America - OSA Publishing, 2020, 28 (9), pp.14161. ⟨10.1364/OE.389565⟩. ⟨hal-02934942⟩

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