Material-Specific Hue Mapping for Optical Strain Quantification in Stretchable Colloidal Films
발표자
이유진 (이화여자대학교)
연구책임자
황혜림 (이화여자대학교)
초록
내용
Colloidal photonic crystals (CPCs) embedded in soft, stretchable films offer a powerful platform for real-time optical strain sensing. We present an image-based quantification method that maps RGB data to HSV space, isolating hue as a precise, scalable indicator of mechanical deformation. As hue corresponds to the dominant Bragg-diffracted wavelength, its shift reflects nanoscale lattice changes under strain. Importantly, the hue–wavelength relationship is material-specific due to variations in refractive index, offering a unique optical fingerprint for each CPC film. Across three materials, we observe highly linear and consistent hue–strain trends. Statistical filtering and brightness normalization further ensure robustness under real-world imaging. This low-cost, non-contact approach establishes hue as a tunable mechanochromic signal, enabling next-generation applications in wearable electronics, soft robotics, and structural diagnostics.