Auxetic Photonic Patterns with Ultrasensitive Mechanochromism for Visualization of Minute Deformation
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Photonic crystals with mechanochromic properties are under intense study for their intuitive colorimetric strain detection in various applications. However, the color change sensitivity to deformation is limited by the degree of deformation, determining the wavelength shift. To address this, we developed auxetic photonic patterns with ultra-sensitive mechanochromism. These patterns have regular cuts, enabling expansion to accommodate strain while the skeletal framework undergoes torsional deformation. By introducing elastic photonic crystals into the cut region, we amplify strains, leading to significant color changes even with small total strains. Adjusting the width of cuts in the auxetic framework allows control over the color change sensitivity. This study achieved maximum sensitivity of up to 60 nm/%, 20 times higher than bulk films. These auxetic photonic patterns offer new possibilities for practical applications in diverse fields, including structural health monitoring.