title: Single polarization transmission in pedestal-supported silicon waveguides.
abstract: In this Letter, properties of a pedestal-supported silicon waveguide are investigated, showing that it supports single polarization transmission. The pedestal is fabricated easily through a wet-etching process on strip waveguides. Theoretical analysis shows that this property is due to the leakage of quasi-TM mode when the pedestal width is small. A polarization extinction ratio larger than 20 dB at 1550 nm is measured in the pedestal waveguide sample, demonstrating single polarization transmission property experimentally. Thanks to its large single polarization transmission bandwidth, robustness in fabrication tolerance, and simple fabrication process, pedestal waveguides will have potential applications as simple silicon-integrated polarizers.
authors: Tsinghua National Laboratory for Information Science and Technology, Department of Electronic Engineering, Tsinghua University, Beijing, 100084, China.
authors: Jierong
authors: J
authors: Cheng
authors: Wei
authors: W
authors: Zhang
authors: Qiang
authors: Q
authors: Zhou
authors: Yu
authors: Y
authors: Wang
authors: Yidong
authors: Y
authors: Huang
authors: Jiangde
authors: J
authors: Peng