We
show femtosecond direct laser-induced assembly of gold nanostructures
with plasmon resonance band variable as a function of laser irradiation
in a wide range of visible wavelengths. A system of 2-photon lithography
is used to achieve site-selectively controlled dewetting of a thin
gold film into nanostructures in which size and shape are highly dependent
on the laser power. Simultaneous measurements of localized surface
plasmon resonance (LSPR) and surface enhanced Raman scattering (SERS)
in the presence of various concentrations of trans-1,2-bis(4-pyridyl)
ethylene (BPE) as target molecule are performed in order to highlight
the relationship between structural dimensions, plasmonic effect,
and detection activity. The resulting gold NPs exhibit high sensitivity
as both LSPR and SERS sensors and allow the detection of picomolar
concentrations of BPE with a SERS enhancement factor (SEF) of 1.33
× 109 and a linear detection range between 10–3 and 10–12 M.
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