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Performance analysis of the salinity based on hexagonal two-dimensional photonic crystal: computational study.

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This study introduces a novel liquid sensor using 2D photonic crystals for precise salinity detection. Optimized hexagonal photonic crystals achieve high sensitivity in the mid-infrared range, offering a practical alternative to traditional sensors.

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Area of Science:

  • Photonics
  • Nanotechnology
  • Material Science

Background:

  • Liquid sensors are crucial for environmental monitoring and industrial processes.
  • Existing salinity sensors have limitations in sensitivity and practicality.
  • Photonic crystals offer unique optical properties for sensing applications.

Purpose of the Study:

  • To design and investigate a novel liquid sensor based on two-dimensional photonic crystals.
  • To optimize hexagonal photonic crystals for mid and far-infrared frequencies.
  • To evaluate the sensing performance for saline water detection.

Main Methods:

  • Utilized COMSOL Multiphysics and the finite element method for simulation.
  • Designed a unique 2D photonic crystal structure with a hexagonal cylinder in a dielectric host.
  • Injected saline water into the central hexagonal cylinder to analyze sensor parameters.

Main Results:

  • Achieved optimal sensor conditions with R=500 nm, D=250 nm, and N=5 periods.
  • Demonstrated high sensitivity (S=525 nm/RIU), figure of merit (FOM=80.7 RIU⁻¹), and quality factor (Q=375).
  • Investigated the impact of structural characteristics on sensing performance.

Conclusions:

  • The proposed photonic crystal sensor exhibits excellent performance for salinity detection.
  • Offers a simple, practical, and efficient alternative to traditional salinity sensors.
  • Potential applications in photo-sensing and thermal desalination techniques.