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Waveguide-integrated spatial mode filters with PtSe2 nanoribbons.

Tianping Xu1,2, Zhengkun Xing1,2, Shuqi Xiao3

  • 1School of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin, China.

Nanophotonics (Berlin, Germany)
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Summary

Researchers developed novel waveguide-integrated spatial mode filters using platinum diselenide (PtSe₂) nanoribbons on silicon waveguides. These filters effectively suppress unwanted modes, advancing mode-division multiplexing (MDM) for optical communications.

Keywords:
low-dimensional materialmode-division multiplexingsilicon photonics

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Area of Science:

  • Heterogeneous silicon photonics
  • Low-dimensional materials
  • Integrated optoelectronics

Background:

  • Silicon photonics is crucial for integrated optoelectronics across various wavelengths.
  • Waveguide components for mode-division multiplexing (MDM) using low-dimensional materials are underexplored.

Purpose of the Study:

  • To demonstrate waveguide-integrated spatial mode filters for eliminating modal crosstalk.
  • To utilize platinum diselenide (PtSe₂) nanoribbons on silicon waveguides for enhanced filtering.

Main Methods:

  • Integration of ten-layer PtSe₂ nanoribbons onto ultrathin silicon waveguides.
  • Design of deep-subwavelength silicon waveguides for mode manipulation.
  • Characterization of modal extinction ratios at 2200-nm wavelength.

Main Results:

  • Achieved TE₁-to-TE₀ modal extinction ratio of 12 dB in a 100-μm waveguide.
  • Achieved TE₂-to-TE₀ modal extinction ratio of 14.5 dB in a 75-μm waveguide.
  • Demonstrated effective filtering of undesirable modes through interaction with PtSe₂ nanoribbons.

Conclusions:

  • Developed a novel approach for waveguide-integrated spatial mode filters.
  • PtSe₂-on-silicon waveguides show promise for on-chip MDM applications.
  • This work facilitates advancements in optical interconnects and communications.