Large-area high-quality plasmonic oligomers fabricated by angle-controlled colloidal nanolithography

We introduce angle-controlled colloidal nanolithography as a fast and low-cost fabrication technique for large-area periodic plasmonic oligomers with complex shapes and tunable geometry parameters. We investigate the optical properties and find highly modulated plasmon modes in oligomers with triangular building blocks. Fundamental modes, higher-order modes, as well as Fano resonances due to coupling between bright and dark modes within the same complex structure are present, depending on polarization and structure geometry. Our process is well-suited for mass fabrication of novel large-area plasmonic sensing devices and nanoantennas.