The scales covering the elytra of the male <i>Hoplia coerulea</i> 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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Kaczmarek, A. M. (Contributeur), Kolaric, B. (Contributeur), Van Hooijdonk, E. (Contributeur), Lobet, M. (Contributeur), Deparis, O. (Contributeur), Vukusic, P. (Contributeur), Van Deun, R. (Contributeur), Mouchet, S. (Contributeur) (1 janv. 2016). Supplementary material from "Controlled fluorescence in a beetle's photonic structure and its sensitivity to environmentally induced changes". Figshare. 10.6084/m9.figshare.c.3593741.v2