Optically variable devices (OVDs) are in tremendous demand as optical indicators against
the increasing threat of counterfeiting. Conventional OVDs are exposed to the danger of …

Structural colors are colors generated by the interaction between incident light and
nanostructures. Structural colors have been studied for decades due to their promising …

The growing interest to develop modern digital displays and colour printing has driven the
advancement of colouration technologies with remarkable speed. In particular, metasurface …

Optical metasurfaces can offer high-quality multichannel displays by modulating different
degrees of freedom of light, demonstrating great potential in the next generation of optical …

Ultrathin dielectric gaps between metals can trap plasmonic optical modes with surprisingly
low loss and with volumes below 1 nm3. We review the origin and subtle properties of these …

The counterfeiting of goods is growing worldwide, affecting practically any marketable item
ranging from consumer goods to human health. Anticounterfeiting is essential for …

An ideal anti-counterfeiting technique has to be inexpensive, mass-producible,
nondestructive, unclonable and convenient for authentication. Although many anti …

Abstract 3D photonic crystals (PCs) have attracted extensive attention due to their unique
optical properties. However, fabricating 3D PCs structure by 3D printing colloidal particles is …

Polarization optics plays a pivotal role in diffractive, refractive, and emerging flat optics, and
has been widely employed in contemporary optical industries and daily life. Advanced …

Plasmonic colours are structural colours that emerge from resonant interactions between
light and metallic nanostructures. The engineering of plasmonic colours is a promising …