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Determination of Crystal Structures01:29

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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
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Humidity sensors based on surface-functionalized tunable photonic crystal grating.

Hao Cui1, Dingwen Hu1, Tao Yang1

  • 1College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, 310027, China.

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|July 3, 2025
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Summary

This study introduces a novel photonic crystal humidity sensor that uses a tunable grating and optical system for precise detection. This overcomes human eye limitations, offering accurate humidity measurements with excellent stability.

Keywords:
Bragg reflectionCzerny–Turner spectrometerHumidity sensorPhotonic crystalSurface-functionalizedTunable grating

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Chemical Sensing

Background:

  • Photonic crystal (PC) sensors offer potential for humidity detection via structural color changes.
  • Current PC humidity sensors rely on subjective visual observation, limiting accuracy and being affected by lighting and viewing angles.

Purpose of the Study:

  • To develop a high-precision optical humidity sensor overcoming the limitations of human eye-based detection.
  • To integrate a surface-functionalized tunable PC grating with a Czerny-Turner optical system for direct spectral shift translation.

Main Methods:

  • Fabrication of a tunable PC grating using 600 nm polystyrene (PS) microspheres and a humidity-sensitive hydrogel.
  • Utilizing the hydrogel's swelling response to humidity to alter the PC lattice spacing and induce spectral shifts.
  • Integration into a Czerny-Turner (C-T) optical system for quantitative spectral analysis.

Main Results:

  • Demonstrated a strong linear response of the sensor to relative humidity (RH) from 24% to 94%.
  • Achieved excellent repeatability and long-term stability in sensor performance.
  • Successfully translated humidity changes into precise spectral shifts, bypassing visual limitations.

Conclusions:

  • The proposed tunable PC grating sensor offers an innovative solution for high-precision optical humidity sensing.
  • The system effectively overcomes the accuracy limitations associated with human visual observation of structural color changes.
  • This technology holds significant promise for advanced humidity detection applications.