Le TERS pour tip enhanced raman scattering, est une technique de pointe (dans tous les sens du terme) basée sur l’amplification du signal Raman relative à la résonance de plasmons de surface. Cette technique non-destructive, qui ne nécessite pas de marquage particulier, permet de caractériser un échantillon à l’échelle nanométrique. Le TERS s’impose aujourd’hui pour sonder les propriétés physico-chimiques des nanomatériaux et participer ainsi au développement de nouvelles applications dans le domaine des nanotechnologies.
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International audienceThe plasmonic properties of individual gold nanowires (NW) have been investigated using both two-photon luminescence (2PL) coupled to atomic force microscopy (AFM) and photoemission electron microscopy (PEEM) associated to low-energy electron microscopy (LEEM) measurements. Using these complementary near-field characterization techniques, comparative studies between wires made either by colloidal chemistry (CC) or by e-beam lithography (EBL) have been undertaken towards a better understanding of the role of the wires crystallinity regarding its optical properties. Considering comparable excitation conditions, we show that wires made by colloidal synthesis exhibits quite similar field enhancement effects ("hot spots") as EBL NW, however their 2PL emission spectrum clearly reveals their crystalline properties
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