title: Submicrometer radius and highly confined plasmonic ring resonator filters based on hybrid metal-oxide-semiconductor waveguide.
abstract: We numerically report the submicrometer radius (0.5 μm) and high confinement (mode area ~λ(2)/1200) plasmonic ring resonators for both all-pass and add-drop filters based on the hybrid metal-oxide-semiconductor (Ag-SiO(2)-Si) waveguide platform. The best tradeoff between the propagation length and the confinement of this hybrid plasmonic waveguide platform is also discussed and compared to the dielectric-loaded plasmonic waveguide counterpart. We show that the ring resonator all-pass filter features an extinction ratio as high as 23 dB with a transmission loss of 1.5 dB, and a wide free spectral range of 168 nm with a bandwidth of 14 nm. Moreover, the demonstrated add-drop filter achieves an extinction ratio larger than 12 dB with a channel isolation between the through and drop channels of 13.5 dB at the resonant wavelength. These demonstrated plasmonic devices reveal as potential building blocks for future nanoscale electronic-photonic integrated circuits.
authors.affiliation: Electronics and Photonics Department, A*STAR-Institute of High Performance Computing, Singapore. chuhs@ihpc.a‑star.edu.sg
authors.forename: Hong-Son
authors.initials: HS
authors.lastname: Chu
authors.forename: Yuriy
authors.initials: Y
authors.lastname: Akimov
authors.forename: Ping
authors.initials: P
authors.lastname: Bai
authors.forename: Er-Ping
authors.initials: EP
authors.lastname: Li