  Direct laser writing method is a promising technique for the large-scale and
cost-effective fabrication of periodic nanostructure arrays exciting hybrid
lattice plasmons. This type of electromagnetic mode manifests a narrow and deep
resonance peak with a high dispersion whose precise controllability is crucial
for practical applications in photonic devices. Here, the formation of
differently shaped gold nanostructures using the direct laser writing method on
Au layers of different thicknesses is presented. The resonance peak is
demonstrated to be highly dependent on the shape of the structures in the
array, thus its position in the spectra, as well as the quality, can be
additionally modulated by changing the morphology. The shape of the structure
and the resonance itself pertain not only on the laser pulse energy but also on
the grating period. This overlapping effect occurring at distances smaller than
the diameter of the focused laser beam is studied in detail. By taking
advantage of the highly controllable plasmonic resonance, the fabricated
gratings open up new opportunities for applications in sensing.
