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<p>With growing attraction about food safety, there is a need to improve detection efficiency, in which the non-destructive testing based on multispectral imaging is favored due to its non-destructive nature, but the traditional multispectral imaging systems have inherent flaws, such as slow speed and large size, hampered their development. In this work, an idea of using photonic crystals absorber as multispectral imaging sensing element is proposed, and a tunable multichannel photonic crystals absorber with bidirectional non-reciprocal absorption features is designed, then the absorption behavior in 400&#xa0;nm to 1000&#xa0;nm wavelength range is investigated. Through adjusting the incident angle, thickness, and period number, stable double-peak absorption over a substantial range to match detection wavelength can be achieved. The detection dimensions include beef moisture prediction, corn species identification, wheat moisture prediction and many other aspects. In addition, the distribution of the electric field has also been studied, and the resonance excitation mechanism is revealed. Optimization of defect layer number has been demonstrated to result in an asymmetry in the number and position of absorption peaks, thereby extend the detection range. Its thickness advantage is a notable feature when compared to conventional multispectral imaging senor element. The tunable multichannel photonic crystals absorber itself has multiple detection indicators, which gives the study consultation in more compact size, higher efficiency, broader bandwidth, and ease of integration into multispectral imaging systems.</p>

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Photonic crystals-based multichannel non-reciprocal absorber intensification in non-destructive detection

  • 期刊论文

  • 发表日期：

    2025年8月8日

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  • Tian Yongfa,
  • Wang Han

摘要

With growing attraction about food safety, there is a need to improve detection efficiency, in which the non-destructive testing based on multispectral imaging is favored due to its non-destructive nature, but the traditional multispectral imaging systems have inherent flaws, such as slow speed and large size, hampered their development. In this work, an idea of using photonic crystals absorber as multispectral imaging sensing element is proposed, and a tunable multichannel photonic crystals absorber with bidirectional non-reciprocal absorption features is designed, then the absorption behavior in 400 nm to 1000 nm wavelength range is investigated. Through adjusting the incident angle, thickness, and period number, stable double-peak absorption over a substantial range to match detection wavelength can be achieved. The detection dimensions include beef moisture prediction, corn species identification, wheat moisture prediction and many other aspects. In addition, the distribution of the electric field has also been studied, and the resonance excitation mechanism is revealed. Optimization of defect layer number has been demonstrated to result in an asymmetry in the number and position of absorption peaks, thereby extend the detection range. Its thickness advantage is a notable feature when compared to conventional multispectral imaging senor element. The tunable multichannel photonic crystals absorber itself has multiple detection indicators, which gives the study consultation in more compact size, higher efficiency, broader bandwidth, and ease of integration into multispectral imaging systems.