Ultra-Broadband and Compact TM-Pass Polarizer Based on Graphene-Buried Polymer Waveguide

Abstract

We report an ultra-broadband and compact TM-pass polarizer based on graphene-buried polymer waveguides. The characteristic parameters of the polarizer were carefully designed and optimized. The standard microfabrication processes were employed to fabricate the device. The presented polarizers exhibit high polarization-dependent transmission imposing a TE mode cutoff while leaving the TM mode almost unaffected. We experimentally demonstrated the polarizer that has an ultra-high extinction ratio of more than 22.9 dB and 41.9 dB for the monolayer graphene film placed on the surface of core layer and buried in the center of core layer, respectively, and as low insertion loss as ~4.0 dB for the TM mode with the bandwidth over 110 nm. The presented polarizer has the advantages of high extinction ratio, ultra-broadband, low cost, and easy integration with other polymer-based planar lightwave devices.

Polymer-Embedding Germanium Nanostrip Waveguide of High Polarization Extinction

“…In previous works, researchers have tried to integrate 2D material such as graphene into the polymer waveguide platform [33,34]. However, the technology to transfer graphene is challenging and often results in large areas of defects, whereas Ge can be easily deposited on wafers using standard e-beam evaporation.…”

Simulation of a High-Performance Polarization Beam Splitter Assisted by Two-Dimensional Metamaterials

“…However, the SOI platform’s highly birefringent property leads to significant polarization dependence, which is undesirable for an optical-fiber network. To resolve this problem, polarization management components, including polarization rotators [ 5 , 6 , 7 , 8 ], polarizers [ 9 , 10 , 11 , 12 , 13 ], and polarization beam splitters (PBSs) [ 14 , 15 , 16 , 17 , 18 , 19 , 20 ], were proposed. Among them, PBSs are the most popular for separating two orthogonal polarizations, the transverse-electric (TE) and the transverse-magnetic (TM), because of effectively using the two polarizations in transmitting optical signals.…”