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On-chip spectrometer with a circular-hole defect for optical sensing applications.

Jun Song1, Xiang Zhou, Yuan-zhou Li

  • 1Institute of Optoelectronics, Key Laboratory of Optoelectronics Devices and Systems of Ministry of Education/Guangdong Province, Shenzhen University, Shenzhen, China. songjun@szu.edu.cn

Optics Express
|October 6, 2012
PubMed
Summary

We developed a highly sensitive optical sensor using amorphous silicon photonics for near-infrared analysis. This sensor can distinguish biodiesel types and measure their concentrations in diesel fuel mixtures.

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Area of Science:

  • Photonics
  • Optical Sensing
  • Spectroscopy

Background:

  • Amorphous silicon photonic platforms offer a versatile base for integrated optical devices.
  • Spectrometers are crucial for analyzing light across various spectra, enabling material identification.
  • High-sensitivity sensors are needed for precise chemical analysis and quality control.

Purpose of the Study:

  • To propose and demonstrate an integrated optical sensor combining a circular-hole defect with an etched diffraction grating spectrometer.
  • To leverage amorphous silicon photonic platforms for enhanced sensor performance.
  • To showcase the sensor's capability in distinguishing and quantifying components in complex mixtures.

Main Methods:

  • Integration of a circular-hole defect with an etched diffraction grating spectrometer on an amorphous silicon photonic platform.

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  • Utilizing the near-infrared spectrum for component analysis.
  • Application in distinguishing biodiesel types and determining concentrations in diesel oil mixtures.

    • Main Results:

    • The developed optical sensor exhibits high sensitivity, measured at approximately 10000 nm/RIU (nanometers per refractive index unit).
    • The integrated spectrometer enables component analysis within the near-infrared spectrum.
    • Successful differentiation of similar biodiesel types and accurate concentration determination in a diesel oil mixture were achieved.

    Conclusions:

    • The proposed optical sensor demonstrates significant potential for high-sensitivity chemical sensing and spectral analysis.
    • Amorphous silicon photonics provides a robust platform for developing advanced integrated optical devices.
    • The sensor's application in biodiesel analysis highlights its utility in quality control and mixture characterization.