Probing plasmonic hot spots on single gold nanowires using combined near-field techniques

Patrick Hsia (1) , Ludovic Douillard (1) , Fabrice Charra (1) , Sylvie Marguet (2) , Serguei Kochtcheev (3) , Renaud Bachelot (3) , Céline Fiorini-Debuisschert (1)

1 LEPO - Laboratoire d'Electronique et nanoPhotonique Organique
2 LEDNA - Laboratoire Edifices Nanométriques
3 LNIO - Laboratoire de Nanotechnologie et d'Instrumentation Optique

The 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.

Keywords: PEEM/LEEM; crystallinity; plasmonic hot spots; gold nanowire; Two-photon luminescence; AFM

Domains: Physics [physics]

Patrick Hsia, Ludovic Douillard, Fabrice Charra, Sylvie Marguet, Serguei Kochtcheev, et al.. Probing plasmonic hot spots on single gold nanowires using combined near-field techniques. Proceedings of SPIE, the International Society for Optical Engineering, 2015, Proc. SPIE 9547, Plasmonics: Metallic Nanostructures and Their Optical Properties XIII, 95470F (28 August 2015), 9547, ⟨10.1117/12.2188025⟩. ⟨cea-01484784⟩