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Compact SOI nanowire refractive index sensor using phase shifted Bragg grating.

P Prabhathan1, V M Murukeshan, Zhang Jing

  • 1School of Mechanical and Aerospace engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.

Optics Express
|August 19, 2009
PubMed
Summary

Phase shifted gratings on silicon-on-insulator waveguides enhance integrated refractive index sensor sensitivity. This design offers narrow bandwidth, high transmittivity, and sharp resonance for improved label-free biosensing.

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Area of Science:

  • Photonics and Nanotechnology
  • Integrated Optics
  • Biosensing Technology

Background:

  • Integrated refractive index sensors are crucial for label-free biosensing.
  • Existing silicon-based sensors face challenges in sensitivity and performance.
  • Submicron silicon-on-insulator (SOI) waveguides offer a platform for advanced photonic devices.

Purpose of the Study:

  • To design and numerically simulate phase shifted vertical side wall gratings for enhanced integrated refractive index sensors.
  • To achieve narrow bandwidth, high transmittivity, and sharp resonant transmission for improved sensor sensitivity.
  • To evaluate the sensor's suitability for label-free biosensing applications and compare its performance with other silicon-based structures.

Main Methods:

  • Numerical simulation of phase shifted vertical side wall gratings on a submicron SOI waveguide.

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  • Design optimization for narrow bandwidth, high transmittivity, and sharp line shape in resonant transmission.
  • Investigation of detection limits using wavelength shift and intensity measurement methods.
  • Comparative performance analysis against Mach-Zehnder interferometers, ring resonators, and surface corrugated Bragg gratings.

    • Main Results:

    • The designed gratings exhibit characteristics suitable for high-performance integrated refractive index sensors.
    • The sensor demonstrates potential for narrow bandwidth, high transmittivity, and sharp resonant transmission.
    • The proposed sensor offers a linear response over a wide wavelength range with a compact structure.
    • The detection limit was investigated, and performance was compared with other silicon-based sensor structures.

    Conclusions:

    • Phase shifted vertical side wall gratings are a promising design for sensitive, label-free integrated refractive index sensors.
    • The sensor's compact structure and linear response make it suitable for biosensing applications.
    • The proposed design offers competitive or improved performance compared to existing silicon-based photonic sensors.