Tuning localized plasmon resonance peaks in golden nanoparticle arrays

Through numerical simulations we have shown that particle plasmon resonance wavelength is dependent mostly on the largest particle in an array of gold nanodisks. Mixing different sized nanodisks may shift the resonance peak wavelength from a few nanometers to tens of nanometers. The effect of period to the resonance peak strength was found to be dependent on the disk diameter in unexpected way. With smaller nanodisks increasing the period decreases peak absorption, but with larger still greatly sub-wavelength particles increasing the period can increase the absorption at resonance peak while decreasing absorption elsewhere on the spectrum giving great selective contrast.