Light filter coating and method of production

A method of applying an optical filtering coating to a substrate, comprising:

• depositing a solution on a surface of a substrate, wherein the solution comprises an organic solvent with nanorods dispersed within the solvent;
• allowing evaporation of the solution to increase a volume fraction of the nanorods in the solution as a function of the evaporation;
• achieving alignment of the nanorods in less than 10 minutes from deposition of the solution on the surface per 0.10 ml of solution deposited on the substrate;
• and
• providing an aligned deposit of the nanorods, as a function of the evaporation, wherein the aligned deposit of nanorods comprises at least thousands of the nanorods with at least a majority of the nanorods aligned relative to a length of the nanorods.