Hybrid Dielectric-Loaded Plasmonic Waveguide-Based Power Splitter and Ring Resonator: Compact Size and High Optical Performance for Nanophotonic Circuits

作者：Chu Hong Son^*; Bai Ping; Li Er Ping; Hoefer Wolfgang R J

来源：Plasmonics, 2011, 6(3): 591-597.

DOI：10.1007/s11468-011-9239-y

• Surface plasmons
• Waveguide
• Power splitter
• Ring resonator

The key challenge of the plasmonic waveguide is to achieve simultaneously both the long propagation length and high confinement. The hybrid dielectric-loaded plasmonic waveguide consists of a SiO(2) stripe sandwiched between a Si-nanowire and a silver film and thus promises as a best candidate to overcome this challenge. We propose to exploit this unique property of this structure to design different high-efficient silicon-based plasmonic components including waveguide, power splitter, and wavelength-selective ring resonator. As a result, the proposed power splitter with a waveguide cross section (lambda (2)/60) and a strong mode confinement area (similar to lambda (2)/240) features a low power transmission loss (< 0.4 dB) at the optimal arm length of 4 mu m with respect to different separation distances of output arms. Moreover, we also demonstrate that a plasmonic ring resonator with a compact ring radius of 2 mu m may achieve high optical performance such as high-extinction ratio of 30 dB, large free spectral range of 67 nm, and small bandwidth of 0.6 nm. These superior performances make them promising building blocks for integrated nanophotonic circuits.

• 出版日期2011-9