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Annular one-dimensional photonic crystals for salinity sensing.

Hassan Sayed1, Mohamed A Swillam2, Arafa H Aly3

  • 1TH-PPM Group, Physics Department, Faculty of Sciences, Beni-Suef University, Beni Suef, 62514, Egypt.

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|November 23, 2023
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Summary

This study introduces a novel annular one-dimensional photonic crystal (1D-PC) sensor for portable salinity detection. The proposed design offers high sensitivity and ease of implementation for field applications.

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Area of Science:

  • Photonics
  • Nanotechnology
  • Sensor Technology

Background:

  • Annular one-dimensional photonic crystals (1D-PCs) offer miniaturization for portable sensing.
  • Field-deployable sensors require integrated and compact designs.

Purpose of the Study:

  • To investigate the use of annular 1D-PCs for effective salinity sensing.
  • To develop a high-performance, portable salinity sensor.

Main Methods:

  • Utilized the finite element method (FEM) with COMSOL Multiphysics for annular 1D-PC design.
  • Constructed a 1D annular PC structure (Si/SiO2 layers) with a saline water defect layer.
  • Optimized sensor performance at normal incidence.

Main Results:

  • Achieved high sensitivity (S), quality factor (Q=10.22), and figure of merit (FOM).
  • Demonstrated optimal performance with a specific Si/SiO2 layer structure and saline water defect.
  • The sensor design showed advantages in ease of implementation and normal incidence performance.

Conclusions:

  • Annular 1D-PCs are suitable for developing miniaturized and portable salinity sensors.
  • The proposed sensor design exhibits superior performance characteristics for practical field use.
  • This research advances the application of photonic crystals in environmental monitoring.