Ultracompact Electrochemical Metallization–Based Tunable Filter with Plasmonic Waveguide.

In this paper, an ultra-compact electrochemical metallization–based tunable filter with a simple metal–insulator–metal (MIM) waveguide system was proposed. The device comprises a MIM waveguide and a resonator with active electrodes. The formation and rupture of conductive filaments in the resonant cavity because of electrochemical metallization can change the resonant wavelength, which leads to the tunability of the transmission characteristics of the filter. The transmission characteristics of band-stop filter and band-pass filter are analyzed by finite element method (FEM) simulation. Numerical results demonstrate that the transmission line of the filter can be shifted by forming and rupture of the conductive filament, which is controlled by changing the applied electric field in the case of fixed structural parameters. The proposed compact tunable filter is a potential candidate for a low power consumption large-scale integrated photonic circuit for applications in optical communication, modulation, and computation. [ABSTRACT FROM AUTHOR]