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CMOS compatible polarization splitter using hybrid plasmonic waveguide.

Jingyee Chee1, Shiyang Zhu, G Q Lo

  • 1Institute of Microelectronics, A*STAR (Agency for Science, Technology and Research), 11 Science Park Road, Science Park-II, 117685 Singapore.

Optics Express
|November 29, 2012
PubMed
Summary

This study presents an ultrashort integrated polarization splitter on a silicon-on-insulator platform. The device utilizes a hybrid plasmonic waveguide for efficient separation of transverse-magnetic and transverse-electric polarized light.

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Area of Science:

  • Photonics and Optical Engineering
  • Integrated Optics
  • Nanophotonics

Background:

  • Polarization splitters are essential components in optical communication systems.
  • Existing devices often face limitations in size, efficiency, or fabrication complexity.
  • Silicon-on-insulator (SOI) platform offers advantages for integrated photonic devices.

Purpose of the Study:

  • To design and experimentally demonstrate an ultrashort integrated polarization splitter.
  • To achieve high extinction ratios and low insertion losses for optical signals.
  • To leverage hybrid plasmonic waveguides for enhanced performance.

Main Methods:

  • Design of a three-core directional coupler incorporating a hybrid plasmonic waveguide.
  • Utilizing finite-difference time-domain (FDTD) and eigenmode expansive (EME) simulations for performance prediction.

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  • Fabrication on the silicon-on-insulator (SOI) platform using standard CMOS technology.
  • Experimental characterization at telecommunications wavelengths.

    • Main Results:

    • Demonstrated an ultrashort integrated polarization splitter with a hybrid plasmonic waveguide.
    • Achieved simulated extinction ratios exceeding 15 dB with <0.5 dB insertion loss.
    • Experimentally obtained extinction ratios of 12.3 dB (TE) and 13.9 dB (TM).
    • Measured insertion losses of 2.8 dB (TE) and 6.0 dB (TM).

    Conclusions:

    • The hybrid plasmonic waveguide enables large birefringence for efficient polarization splitting.
    • The developed device is compatible with standard CMOS fabrication processes.
    • The demonstrated polarization splitter shows promise for compact and high-performance optical systems.