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The back cover illustrates band‐gap tunable bioinspired photonic fibers created by Peter Vukusic, Mathias Kolle, and co‐workers on page 2239 that incorporate the structural key elements responsible for a tropical fruit's bright coloration. In the foreground a rendering of a gradually strained, colorchanging fiber is winding around another real fiber. The background features the cells in the fruit's...
The concentrically‐layered photonic structure found in the tropical fruit Margaritaria nobilis serves as inspiration for photonic fibers with mechanically tunable band‐gap. The fibers show the spectral filtering capabilities of a planar Bragg stack while the microscopic curvature decreases the strong directional chromaticity associated with flat multilayers. Elongation of the elastic fibers results...
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