Article
Version 1
Preserved in Portico This version is not peer-reviewed
Polymer-Embedding Germanium Nanostrip Waveguide of High Polarization Extinction
Version 1
: Received: 18 September 2023 / Approved: 19 September 2023 / Online: 20 September 2023 (07:43:13 CEST)
A peer-reviewed article of this Preprint also exists.
Liu, J.; Zhang, Z. Polymer-Embedding Germanium Nanostrip Waveguide of High Polarization Extinction. Polymers 2023, 15, 4093. Liu, J.; Zhang, Z. Polymer-Embedding Germanium Nanostrip Waveguide of High Polarization Extinction. Polymers 2023, 15, 4093.
Abstract
Germanium (Ge) nanostrip is embedded in polymer and studied as a waveguide. Measurement reveals that this new type of semiconductor/polymer heterogeneous waveguide exhibits strong absorption for the TE mode from 1500 nm to 2004 nm, while the propagation loss for the TM mode declines from 20.56 dB/cm at 1500 nm to 4.89 dB/cm at 2004 nm. The transmission characteristics serves as an essential tool to verify the optical parameters (n-κ) of the thin strips, addressing to the ambiguity raised by spectroscopic ellipsometry regarding highly absorbing materials. Furthermore, the observed strong absorption for the TE mode at 2004 nm is well beyond the cut-off wavelength of the crystalline bulk Ge (~1850 nm at room temperature). This redshift is modeled to manifest the narrowing of the Tauc-fitted bandgap due to the grain order effect in the amorphous Ge layer. The accurate measurement of the nanometer-scale light-absorbing strips in a waveguide form is a crucial step toward the accurate design of integrated photonic devices that utilize such components.
Keywords
polymer waveguide technology; integrated optics; germanium waveguide; spectroscopic ellipsometry; hybrid integration
Subject
Physical Sciences, Optics and Photonics
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Comments (0)
We encourage comments and feedback from a broad range of readers. See criteria for comments and our Diversity statement.
Leave a public commentSend a private comment to the author(s)
* All users must log in before leaving a comment
