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Structurally colored materials are often used for their resistance to photobleaching and their complex viewing‐direction‐dependent optical properties. Frequently, absorption has been added to these types of materials in order to improve the color saturation by mitigating the effects of nonspecific scattering that is present in most samples due to imperfect manufacturing procedures. The combination...
We present a colorimetric indicator that distinguishes organic liquids, projecting small differences in wettability into visually distinct color patterns. Photonic crystals serve as both selective carriers for liquids and sources of responsive color.
We use highly controlled partial wetting in chemically encoded 3D photonic crystals to study tunable disorder in structurally colored systems. Our experimental and FDTD analyses also guide our design of a colorimetric indicator for organic liquids.
We demonstrate a 3D porous photonic crystal whose inner surfaces are chemically functionalized in arbitrary spatial patterns with micro-scale resolution. We use this platform to demonstrate a method for solvent-specific multi-layer message encryption.
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