Biomimetic structural coloration with tunable degree of angle-independence generated by two-photon polymerization

Biomimetic isotropic nanostructures for structural coloration.

Many species of birds have feathers that are brilliantly colored without the use of pigments. In these cases, light of specifi c wavelengths is selectively scattered from nanostructures with variations in index of refraction on length-scales of the order of visible light. [ 1 ] This phenomenon is called structural color. The most striking examples of structural color in nature are iridescent co...

Three-Dimensional Microfabrication by Two-Photon Polymerization

Girth, minimum degree, independence, and broadcast independence

An independent broadcast on a connected graph $G$is a function $f:V(G)to mathbb{N}_0$such that, for every vertex $x$ of $G$, the value $f(x)$ is at most the eccentricity of $x$ in $G$,and $f(x)>0$ implies that $f(y)=0$ for every vertex $y$ of $G$ within distance at most $f(x)$ from $x$.The broadcast independence number $alpha_b(G)$ of $G$is the largest weight $sumlimits_{xin V(G)}f(x)$of an ind...

Band Structure of Photonic Crystals Fabricated by Two-Photon Polymerization

We study theoretically the band-gap structures of several types of three-dimensional photonic crystals with the fcc lattice symmetry: synthetic opals, inverted yablonovite and woodpile. The samples of inverted yablonovite, inverted yablonovite with a glassy superstructure and woodpile are fabricated by two-photon polymerization through a direct laser writing technique, which allows the creation...

Two-Photon Polymerization Fabrication of Doped Microstructures