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High-Sensitivity and Temperature-Robust Gas Sensor Based on Magnetically Induced Differential Mode Splitting in InSb

Jin Zhang1, Leyu Chen1, Chenxi Xu2

  • 1College of Electronic Engineering, Tongda College of Nanjing University of Posts and Telecommunications, Yangzhou 225127, China.

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Summary
This summary is machine-generated.

This study introduces a novel Magneto-Optical Differential Photonic Crystals Sensor (MO-DPCS) for precise hazardous gas detection. The MO-DPCS achieves high sensitivity and minimizes thermal noise, enhancing industrial safety.

Keywords:
differential detection strategyindium antimonidemagneto-optical photonic crystalsmulti-objective dragonfly algorithmrefractive index sensingtemperature robustness

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Area of Science:

  • Photonics
  • Sensors
  • Materials Science

Background:

  • Hazardous gas detection is crucial for industrial safety.
  • Conventional sensors lack sensitivity and are affected by thermal cross-sensitivity.
  • Low refractive index gases (1.000-1.100) like methane require high-precision detection.

Purpose of the Study:

  • To develop a Magneto-Optical Differential Photonic Crystals Sensor (MO-DPCS) for high-precision hazardous gas detection.
  • To overcome the limitations of conventional sensors, including low sensitivity and thermal cross-sensitivity.
  • To optimize the sensor for enhanced magneto-optical polarization splitting and transmission efficiency.

Main Methods:

  • Utilized indium antimonide (InSb) in the MO-DPCS.
  • Employed the Multi-Objective Dragonfly Algorithm (MODA) for inverse optimization.
  • Established an angular interrogation architecture under oblique incidence for magneto-optical non-reciprocity.
  • Implemented a differential detection technique leveraging non-reciprocal phase changes in TE and TM modes.

Main Results:

  • Achieved exceptional differential sensitivity of 30.8°/RIU with a 0.033 T magnetic field, significantly higher than the unmagnetized condition (0.8°/RIU).
  • Minimized temperature-induced drift to below 0.35° across a 1 K range by eliminating common-mode thermal noise.
  • Demonstrated a detection limit of 4.18 × 10-4 RIU.

Conclusions:

  • The MO-DPCS offers a robust, self-referencing solution for stable and high-sensitivity gas sensing.
  • The sensor effectively addresses limitations of conventional gas detection methods.
  • This technology enhances industrial safety through precise monitoring of hazardous gases.