Abstract
In recent years, extensive research activities are devoted to metal nanoparticles or nanostructures due to their applications as highly efficient chemical or biological sensors, nanophotonic devices, etc. This work utilizes atomic force microscopy nanolithography to fabricate gold nanodot and nanowire arrays on silicon substrates, and dark-field optical microscopy to investigate their localized surface plasmon resonance characteristics. For an obtained gold nanodot array, the average diameter is around 72nm after thermal treatment, and the resonance peak in scattering spectrum is located at 548nm. For the gold nanowire arrays, the thickness is 20nm and the widths are ranging between 50 and 100nm. The scattering spectra are composed of two resonance peaks in the blue and the red regions. It is also found that when the width is increased, the red peak experiences a red shift, whereas the blue peak remains unchanged. It is clear that the two peaks can be attributed to resonances along the thickness and width directions of the nanowires