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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Polarization Control in Integrated Graphene-Silicon Quantum Photonics Waveguides.

Simone Cammarata1,2, Andrea Fontana3, Ali Emre Kaplan3,4

  • 1Istituto Nazionale di Fisica Nucleare (INFN) Sezione di Pisa, 56127 Pisa, Italy.

Materials (Basel, Switzerland)
|December 23, 2022
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Summary

Graphene nanoribbons on silicon waveguides control light polarization. Adjusting graphene potential and waveguide geometry offers tunable TE-pass or TM-pass functionalities with reduced losses.

Keywords:
polarization controlquantum photonicssilicon-graphene heterostructure

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Area of Science:

  • Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Silicon photonics is crucial for integrated circuits.
  • Controlling light polarization is essential for optical communication and sensing.
  • Graphene's unique electronic properties offer potential for novel photonic devices.

Purpose of the Study:

  • To numerically investigate graphene nanoribbons for polarization control in silicon-on-insulator (SOI) strip waveguides.
  • To identify key factors influencing polarization control performance.
  • To explore methods for optimizing device performance, including insertion loss and polarization extinction ratio.

Main Methods:

  • Numerical simulations were performed to analyze the interaction of light with graphene nanoribbons on SOI waveguides.
  • The study focused on varying graphene chemical potential and waveguide geometrical parameters (widths, distance).
  • The impact of oxide spacer thickness on device performance was also investigated.

Main Results:

  • Graphene chemical potential and waveguide geometry significantly affect polarization control.
  • Waveguide width tapering was shown to enable both TE-pass and TM-pass polarizing functionalities.
  • Increasing the oxide spacer thickness reduced insertion losses while maintaining a high polarization extinction ratio.

Conclusions:

  • Graphene nanoribbons are a viable solution for polarization control in silicon photonic integrated waveguides.
  • Tunable polarization control can be achieved by manipulating graphene chemical potential and waveguide dimensions.
  • Optimizing the oxide spacer thickness is key to balancing insertion loss and polarization performance.