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Polymer-Embedding Germanium Nanostrip Waveguide of High Polarization Extinction.

Jinyuan Liu1,2, Ziyang Zhang2

  • 1College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China.

Polymers
|October 28, 2023
PubMed
Summary

This study introduces a novel germanium nanostrip polymer waveguide. It demonstrates strong light absorption and reduced propagation loss, crucial for designing advanced integrated photonic devices.

Keywords:
germanium waveguidehybrid integrationintegrated opticspolymer waveguide technologyspectroscopic ellipsometry

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Area of Science:

  • Photonics
  • Materials Science
  • Optoelectronics

Background:

  • Semiconductor-polymer heterogeneous waveguides are emerging components in integrated photonics.
  • Accurate characterization of optical parameters for materials like germanium (Ge) is essential for device design.
  • Spectroscopic ellipsometry faces challenges with highly absorbing materials, necessitating alternative measurement techniques.

Purpose of the Study:

  • To investigate the optical properties of a germanium nanostrip embedded in a polymer waveguide.
  • To assess the potential of this heterogeneous waveguide for optical applications.
  • To develop a method for verifying optical parameters of nanostrip components.

Main Methods:

  • Fabrication of a germanium nanostrip embedded in a polymer.
  • Optical transmission measurements of the waveguide across a specific wavelength range.
  • Analysis of propagation loss for transverse magnetic (TM) and transverse electric (TE) modes.
  • Modeling of bandgap narrowing using Tauc fitting.

Main Results:

  • The germanium/polymer waveguide exhibits strong TE mode absorption from 1500 nm to 2004 nm.
  • TM mode propagation loss decreases from 20.56 dB/cm at 1500 nm to 4.89 dB/cm at 2004 nm.
  • Observed TE mode absorption at 2004 nm exceeds the bulk crystalline Ge cut-off wavelength, attributed to bandgap narrowing in amorphous Ge.

Conclusions:

  • The transmission characteristics of the waveguide accurately verify optical parameters (refractive index and extinction coefficient) of the germanium nanostrip.
  • The redshift in absorption is linked to a narrowed Tauc-fitted bandgap due to grain ordering in the amorphous germanium layer.
  • Precise characterization of light-absorbing nanostrips in waveguides is vital for the development of integrated photonic devices.