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Highly sensitive Si nanowire-based optical sensor using a Mach-Zehnder interferometer coupled microring.

Jianwei Wang1, Daoxin Dai

  • 1Centre for Optical and Electromagnetic Research, State Key Laboratory for Modern Optical Instrumentation, East Building No. 5, Zijingang Campus, Zhejiang University, Hangzhou, 310058, China.

Optics Letters
|December 18, 2010
PubMed
Summary

A novel Mach-Zehnder interferometer coupled microring sensor achieves high sensitivity and a broad measurement range for refractive index changes. This optical sensor demonstrates excellent performance for detecting variations in ambient refractive index.

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Area of Science:

  • Photonics and Optical Sensing
  • Integrated Optics
  • Interferometry

Background:

  • Refractive index sensing is crucial for various applications.
  • Existing sensors often face limitations in sensitivity or measurement range.
  • Mach-Zehnder interferometers (MZI) offer potential for high-performance sensing.

Purpose of the Study:

  • To demonstrate a Mach-Zehnder interferometer coupled microring sensor.
  • To achieve high sensitivity and a large measurement range for refractive index sensing.
  • To investigate the performance of this integrated optical sensor.

Main Methods:

  • Experimental demonstration of a Mach-Zehnder interferometer (MZI) coupled microring.
  • Utilizing a major resonance wavelength with a high extinction ratio.

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  • Achieving a large quasi-free spectral range (>120 nm).

    • Main Results:

    • The MZI-coupled microring sensor exhibited high sensitivity of 111 nm/refractive index unit.
    • A large measurement range for ambient refractive index from 1.0 to 1.538 was achieved.
    • High extinction ratios (16-36 dB) were observed over a broad wavelength span.

    Conclusions:

    • The MZI-coupled microring sensor provides a robust platform for accurate refractive index measurements.
    • The sensor design enables both high sensitivity and an extended measurement range.
    • This technology holds promise for advanced optical sensing applications.