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Optical response of the SHIO. (A) Measured reflectance spectra of the SHIO. The reflectance peak is red-shifted when water and IPA infiltrate the SHIO. (B) Photonic band structures of the SHIO in air (blue), water (orange), and IPA (red), calculated using the PWE method. Unlike immersion in IPA, water molecules are absorbed into the SHIO, which then expands its structure, resulting in a reduced refractive index of the silk matrix.
