Gold nanoparticle solutions were used to make highly absorbing, dense nanoparticle stacks (DNpS) using a simple and inexpensive solution cast method. UV-Vis spectroscopy and reflection measurements were used to characterize absorption. The critical nanoparticle number necessary to obtain maximal absorption was determined for each sample. DNpS metamaterials made from 18- and 44-nm-diameter particles exhibited broadband absorbances above 80 %, with the highest absorption of 95 % at 532 nm. The experimental absorption results agree well with finite-difference time-domain (FDTD) modeling.
- Disordered plasmonics
- Metamaterial absorbers