Biomaterial‐Based "Structured Opals" with Programmable Combination of Diffractive Optical Elements and Photonic Bandgap Effects. Issue 5 (6th December 2018)

• Record Type: Journal Article
• Authors: Wang, Yu; Li, Wenyi; Li, Meng; Zhao, Siwei; De Ferrari, Fabio; Liscidini, Marco; Omenetto, Fiorenzo G.
• Is Part Of: Advanced materials. Volume 31:Issue 5(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-12-06
• Subjects: diffusion/diffraction -- hierarchical 3D photonic structures -- multifunctionality -- silk fibroin -- structural color; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201805312
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Naturally occurring iridescent systems produce brilliant color displays through multiscale, hierarchical assembly of structures that combine reflective, diffractive, diffusive, or absorbing domains. The fabrication of biopolymer‐based, hierarchical 3D photonic crystals through the use of a topographical templating strategy that allows combined optical effects derived from the interplay of predesigned 2D and 3D geometries is reported here. This biomaterials‐based approach generates 2D diffractive optics composed of 3D nanophotonic lattices that allow simultaneous control over the reflection (through the 3D photonic bandgap) and the transmission (through 2D diffractive structuring) of light with the additional utility of being constituted by a biocompatible, implantable, edible commodity textile material. The use of biopolymers allows additional degrees of freedom in photonic bandgap design through directed protein conformation modulation. Demonstrator structures are presented to illustrate the lattice multifunctionality, including tunable diffractive properties, increased angle of view of photonic crystals, color‐mixing, and sensing applications. Abstract : Multifunctional, biomaterial‐based hierarchical 3D photonic crystals are developed via a combination of protein self‐assembly, colloidal assembly, and topographical templating. This biomaterials‐based approach generates the integration of multiple optical functions within a single material, including tunable diffractive properties, increased angle of view, and color mixing. These coexistent functions offer the end materials potential applications in wide‐angle pattern displays and dual sensing.