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Structural Coloration by Cascading Total Internal Reflection and Interference at Microscale Concave Interfaces
Wednesday, March 10, 2021: 2:05 PM - 2:40 PM
Speaker(s)
Description
A variety of physical phenomena create color, such as selective absorption by dyes or pigments, optical dispersion, and structural color by light interference. Nature has exquisitely harnessed structural color, with examples including opals, butterfly wings, and iridescent bird feathers. Here, we describe a previously unrecognized mechanism for creating iridescent structural color with large angular spectral separation inspired by water micro-droplets. Light traveling by different trajectories of total internal reflection along a concave optical interface can interfere to generate brilliant patterns of color. The effect is generated at interfaces with dimensions that are orders of magnitude larger than the wavelength of visible light and is readily observed in systems as simple as water drops condensed on a transparent substrate. We also exploit this phenomenon in complex systems, including multiphase droplets, 3D patterned polymer surfaces, and solid micro-particles, to create patterns of iridescent color that are consistent with theoretical predictions. Given the ease by which controllable structural coloration is generated at microscale interfaces, we expect that the design principles and predictive theory outlined here will be of interest for fundamental exploration in optics and application in functional colloidal inks and paints, displays, and sensors.
Additional Info
Keywords: Please select up to 4 keywords ONLY:
Light Scattering,Polymers
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