Surface enhanced Raman scattering on gold nanowire arrays: Evidence of strong multipolar surface plasmon resonance enhancement

Laurent Billot (1) , Marc Lamy de La Chapelle (1) , Anne-Sophie Grimault (1) , Alexandre Vial (1) , Dominique Barchiesi (1) , Jean-Louis Bijeon (1) , Pierre-Michel Adam (1) , Pascal Royer (1)

1 LNIO - Laboratoire de Nanotechnologie et d'Instrumentation Optique

The SERS efficiency of gold nanowires arrays elaborated by electron beam lithography and lift-off technique efficiency is investigated by depositing a molecular probe (BPE) trans-1,2-bis(4-pyridyl)ethylen on the arrays and using an excitation wavelength of 632.8 nm. The observation of the dependence of the Raman enhancement versus the nanowire length is clearly demonstrated and remarkably a maximum enhancement is observed. For such arrays, we also show clearly that odd multipolar localised surface plasmon modes (up to seventh-order) exhibits a stronger efficiency than the first dipolar order in SERS process.

Domains: Chemical Sciences

Laurent Billot, Marc Lamy de La Chapelle, Anne-Sophie Grimault, Alexandre Vial, Dominique Barchiesi, et al.. Surface enhanced Raman scattering on gold nanowire arrays: Evidence of strong multipolar surface plasmon resonance enhancement. Chemical Physics Letters, 2006, 422 (4-6), pp.303-307. ⟨10.1016/j.cplett.2006.02.041⟩. ⟨hal-02369842⟩