The photonic structures we could borrow from Nature (original) (raw)

Abstract

Nature provides a wide variety of micro and nanostructures with photonic band-gaps. One can admire their spectral properties in some species of butterflies or beetles for instance. Beside their amazing colors, natural photonics structures have also been optimized through ages. In this talk, we will see how borrowing photonic crystals from Nature with the support of micro and nanotechnologies can lead to new synthetic photonic structures that would improve the performances of solar cells, light-emitting diodes and nanosensors. More specifically, we will show 1) the replication of butterfly wings directly on the surface of silicon to improve the light absorption of silicon solar cells, 2) a new concept inspired by firefly to enhance the light extraction of GaN-based light-emitting diodes, and 3) the Bragg reflectors cavities of butterflies and beetles to develop new types of microsensors. The different cases will highlight key technologies such as atomic layer deposition, nano-imprint, direct laser writing or colloids to fabricate bio-inspired photonic structures, all along with an in-depth understanding of the optical behavior of natural structures helped by the direct observation of samples, their modeling and simulation.

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