The scales covering the elytra of the male Hoplia coerulea beetle contain fluorophores embedded within a porous photonic structure. The photonic structure controls both insect colour (reflected light) and fluorescence emission. Herein, the effects of water-induced changes on the fluorescence emission from the beetle were investigated. The fluorescence emission peak wavelength was observed to blue-shift on water immersion of the elytra whereas its reflectance peak wavelength was observed to red-shift. Time-resolved fluorescence measurements, together with optical simulations, confirmed that the radiative emission is controlled by a naturally engineered photonic bandgap while the elytra are in the dry state, whereas non-radiative relaxation pathways dominate the emission response of wet elytra.
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Mouchet, S. R. (Contributeur), Lobet, M. (Contributeur), Kolaric, B. (Contributeur), Kaczmarek, A. M. (Créateur), Deun, R. V. (Créateur), Vukusic, P. (Créateur), Deparis, O. (Contributeur), Hooijdonk, E. V. (Contributeur) (28 déc. 2016). Supplementary material from "Controlled fluorescence in a beetle's photonic structure and its sensitivity to environmentally induced changes". University of Namur. 10.6084/m9.figshare.c.3593741.v1