Enhanced Light Absorption in All-Polymer Biomimetic Photonic Structures by Near-Zero-Index Organic Matter

Natural photosynthetic photonic nanostructures can show sophisticated light-matter interactions including enhanced light absorption by slow light even for highly pigmented systems. Beyond fundamental biology aspects, these natural nanostructures are very attractive as blueprints for advanced photonic devices. But the soft-matter biomimetic implementations of such nanostructures is challenging due to the low refractive index contrast of most organic photonic structures. Excitonic organic materials with near-zero index (NZI) optical properties allow overcoming these bottlenecks. Here, it is demonstrated that the combination of NZI thin films with photonic multilayers like the ones found in nature enables broadband tunable strong reflectance as well as slow light absorption enhancement and tailored photoluminescence properties in the full VIS spectrum. Moreover, it is shown that this complex optical response is tunable, paving the way toward the development of active devices based on all-polymer and near-zero index materials photonic structures.

Automated summary

Natural photosynthetic photonic nanostructures demonstrate sophisticated light-matter interactions, offering potential for advanced photonic devices; combining NZI materials with natural photonic multilayers enables broad tunable reflectance, slow light absorption enhancement, and tailored photoluminescence properties in the visible spectrum; the tunability of this complex optical response opens up possibilities for developing active devices based on all-polymer and near-zero index materials photonic structures.