- What features of glasswing butterfly and Cicada wing nanostructures are being mimicked to achieve omnidirectional antireflection on fused silica?
Structural Color
Color produced by nanoscale geometry rather than pigment.
- What length-scale condition allows an isotropic (non-crystalline) nanostructure to produce structural color?
- Why must wavelength-independent scattering be suppressed to achieve pure structural color rather than a whitened appearance?
- How do these self-assembled isotropic structures differ from the ordered branching architecture of butterfly wing-scale lamellae, and what does that mean for coating applications?
- How does block copolymer self-assembly during polymer processing produce the periodic nanostructures responsible for structural color in 3D-printed parts?
- Why does increasing the molecular weight of a block copolymer shift the reflected structural color toward longer (redder) wavelengths?
- What advantages does a block copolymer self-assembly route offer over lithography for manufacturing structurally colored plastic parts at scale?
- Why does faithfully replicating butterfly wing scale optics require hierarchical nanostructures rather than a single length scale?
- What role do alternating high/low refractive index oxide layers (e.g. TiO2/SiO2) deposited via sol-gel processing play in reproducing structural coloration?
- Which process variables control the resulting structural color of a sedimented silica colloidal crystal film?
- How does Bragg diffraction from a face-centered cubic colloidal lattice determine the reflected wavelength of structural color?
- How does loading a Bragg reflector with beta-carotene pigment reduce the number of layers needed to reach high reflectance compared to a pigment-free structure?
- Why can pigment absorption inside a photonic structure boost reflectance at wavelengths that lie outside the pigment's own absorption band?
- How does combining pigment with nanostructure suppress iridescence and expand the achievable gamut of non-iridescent colors, as seen in butterfly coloration?
- How can hierarchical micro- and nano-scale laser patterning replicate biological functions such as structural color, superhydrophobicity, and antibacterial surfaces?
- What wet-chemistry routes can produce structural color without cleanroom fabrication equipment?
- What minimum equipment and budget are needed to build a lab setup for solution-processed structural color fabrication?