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A Mach-Zehnder interferometer based on silicon oxides for biosensor applications.

Jongin Hong1, Jung Sung Choi, Gayoung Han

  • 1Microsystem Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul, Republic of Korea. kairduck@kist.re.kr

Analytica Chimica Acta
|August 29, 2007
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Summary

This study demonstrates a novel Mach-Zehnder interferometer (MZI) biosensor using silicon oxides. The sensor achieves high sensitivity for detecting biomolecules through controlled refractive index and total internal reflection (TIR) waveguides.

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Area of Science:

  • Integrated optics
  • Biosensor technology
  • Materials science

Background:

  • Integrated optical devices are crucial for sensitive biosensing in environmental, biological, and medical fields.
  • Mach-Zehnder interferometers (MZI) offer high sensitivity and accuracy for optical transduction in microfluidic systems.
  • Silicon-based dielectrics are attractive for integrated optics due to their tunable refractive indices.

Purpose of the Study:

  • To realize a Mach-Zehnder interferometer (MZI) biosensor using silicon oxides.
  • To control the refractive index of silicon oxides via oxygen concentration for single-mode waveguide fabrication.
  • To verify the feasibility of the MZI sensor for direct detection of immunoreactions.

Main Methods:

  • Fabrication of a Mach-Zehnder interferometer (MZI) sensor utilizing silicon oxides.
  • Control of the silicon oxide refractive index by adjusting oxygen concentration.
  • Implementation of total internal reflection (TIR) waveguides for single-mode behavior.
  • Experimental verification of the MZI sensor's performance in detecting immunoreactions.

Main Results:

  • Successfully realized an MZI sensor based on silicon oxides with tunable refractive indices.
  • Achieved single-mode waveguide behavior by controlling oxide refractive index through oxygen concentration.
  • Demonstrated the feasibility of the MZI sensor for direct detection of immunoreactions.

Conclusions:

  • Silicon oxide-based MZI sensors are a viable platform for sensitive biosensing.
  • Tunable refractive index in silicon oxides is key for designing effective integrated optical waveguides.
  • The developed MZI sensor shows promise for direct and accurate biomolecule detection.