Abstract

The polarization dependent nature of a central waveguide in a three-core directional coupler plays a key role in splitting polarized guided modes onto different layers of 3-D silicon photonic circuits. Here, we investigate the dependence of beam splitting characteristics on the central hybrid plasmonic waveguides. We used three Si-based hybrid long-range surface plasmon polariton (LR-SPP) waveguides: a Si–M–Si, a Si–SiO₂–M–Si, and a Si–SiO₂–M–SiO₂–Si waveguide, where M is a metal or an emerging plasmonic material. Numerical simulations revealed that the device using a symmetric LR-SPP waveguide structure provided the most satisfactory optical characteristics. On the entire C-band, the extinction ratios for 3-D and 2-D polarization beam splitting were larger than 20 dB and the insertion losses were less than 0.25 dB. Based on theoretical investigations, we suggest some design guidance for the proposed three-core-based 3-D polarization beam splitters using a Si-based hybrid LR-SPP waveguide.

© 2014 IEEE

Compact silicon-based TE-pass polarizer using a symmetrical triple-guide directional coupler including SWG structures and hybrid plasmonic waveguides

Nan Yang and Jinbiao Xiao
Appl. Opt. 60(9) 2567-2573 (2021)

Ultracompact polarization beam splitter based on a dielectric–hybrid plasmonic–dielectric coupler

Fei Lou, Daoxin Dai, and Lech Wosinski
Opt. Lett. 37(16) 3372-3374 (2012)

Extremely small polarization beam splitter based on a multimode interference coupler with a silicon hybrid plasmonic waveguide

Xiaowei Guan, Hao Wu, Yaocheng Shi, and Daoxin Dai
Opt. Lett. 39(2) 259-262 (2014)

Directional coupler based on an elliptic cylindrical nanowire hybrid plasmonic waveguide

Dezheng Zeng, Li Zhang, Qiulin Xiong, and Junxian Ma
Appl. Opt. 57(16) 4701-4706 (2018)

On-chip polarization splitter based on a multimode plasmonic waveguide

Fengyuan Gan, Chengwei Sun, Hongyun Li, Qihuang Gong, and Jianjun Chen
Photon. Res. 6(1) 47-53 (2018)