Idvac Introduces Layer-by-Layer Nano-Etching Technique for Multispectral Colours

Idvac Ltd, based in Manchester, UK, has unveiled a ground-breaking method for fabricating bespoke multispectral colours using a layer- by-layer nano-etching process.

Traditionally, achieving vibrant colours involves pigments, inks, or printing. Idvac has developed an alternative approach with no print or inks used. The process begins with vacuum metallising a specially developed single optical coating onto a standard aluminium metallised film within a standard roll-to-roll vacuum web metalliser.

According to the company, what makes the method truly unique is the controlled chemical etching used for the layer-by-layer removal of 5nm of the coating. The result is a spectrum of bright colours, including red, blue, yellow, and silver. Laser dry etching can also be employed for precise removal, providing flexibility in the fabrication process. The effect is created as metallised aluminium acts as a mirror, reflecting the different colours produced through the etching process.

Idvac’s layer-by-layer nano-etching sample showing various bright colours.

 

The applications of this technology are vast. Selective coloration of films finds utility in light filters, solar control windows, and security holographic documents. Idvac’s latest development allows for the creation of a matrix of colours, which, when combined with holographic technology, can be incorporated into the core of blank security documents before lamination.

Under the leadership of Prof Nadir Ahmed, Idvac has been at the forefront of advanced metallising processes since its founding in 2004. With over 20 years of success, the company has introduced various vacuum processes and technologies, including HRI (ZnS), copper, red copper, SiOx, AlOx, silver, gold colour (no ink or pigments), colour shift. In addition to its colour innovation, the company has also developed a corrosion protection process to safeguard metallised copper from tarnishing.