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Ultrahigh Sensitivity Mach-Zehnder Interferometer Sensor Based on a Weak One-Dimensional Field Confinement Silica

Chenming Zhao1, Lei Xu1, Liying Liu1

  • 1Key Lab for Micro and Nanophotonic Structures (Ministry of Education) of Ultra Precision Optical Manufacturing, Shanghai Engineering Research Center, Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China.

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Summary
This summary is machine-generated.

A new Mach-Zehnder interferometer sensor uses a weak one-dimensional field confinement silica waveguide for enhanced sensitivity. This novel sensor achieves ultrahigh waveguide sensitivity and a low limit of detection for refractive index sensing.

Keywords:
Mach−Zehnder interferometer sensorwaveguide sensitivityweak confinement waveguide

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Area of Science:

  • Photonics and optical sensing technologies.
  • Nanophotonics and waveguide-based devices.

Background:

  • Mach-Zehnder interferometers (MZIs) are widely used for sensing applications.
  • Achieving high sensitivity and low detection limits in MZI sensors remains a challenge.

Purpose of the Study:

  • To develop a novel MZI sensor with enhanced sensitivity and a low limit of detection.
  • To investigate the performance of a weak one-dimensional field confinement silica waveguide (WCSW) in an MZI sensor.

Main Methods:

  • Fabrication of a WCSW with a large aspect ratio and low refractive index difference.
  • Integration of the WCSW into an MZI sensor configuration.
  • Experimental characterization of the sensor's waveguide sensitivity, MZI sensitivity, and limit of detection.

Main Results:

  • The WCSW demonstrated easy preparation and a large evanescent field.
  • Ultrahigh waveguide sensitivity of 0.94 was achieved.
  • The MZI sensor exhibited a sensitivity of 44,364 π/RIU and a low limit of detection (LOD) of 6.1 × 10⁻⁷ RIU.

Conclusions:

  • The novel WCSW-based MZI sensor offers a promising platform for high-performance refractive index sensing.
  • The sensor design facilitates easy fabrication and achieves superior sensitivity and detection limits.
  • This technology has potential applications in various fields requiring precise optical sensing.