Transition from capacitive coupling to direct charge transfer in asymmetric terahertz plasmonic assemblies

Opt Lett. 2016 Nov 15;41(22):5333-5336. doi: 10.1364/OL.41.005333.


We experimentally and numerically analyze the charge transfer THz plasmons using an asymmetric plasmonic assembly of metallic V-shaped blocks. The asymmetric design of the blocks allows for the excitation of classical dipolar and multipolar modes due to the capacitive coupling. Introducing a conductive microdisk between the blocks, we facilitated the excitation of the charge transfer plasmons and studied their characteristics along with the capacitive coupling by varying the size of the disk.