Science Daily December 17, 2018
Researchers at the University of Central Florida created a three-level, layered, “plasmonic” system that sandwiches a polymer layer imprinted with nanoscale holes, between a gold mirror at the bottom and a gold layer at the top with holes that match the polymer layer. Images can be imprinted on top of the “plasmonic sandwich,” and aspects of the holes, such as size and depth, help dictate which infrared band the image can be seen in. Varying the pattern characteristics allows the researchers to control the electron plasma resonance created when light hits the device. By controlling this electron plasma resonance, they could control which color of light or which band of light is absorbed and reflected. The technology has application in anti-counterfeiting security, infrared tagging or infrared camouflages, and in the military…read more. Open Access TECHNICAL ARTICLE
Schematic of the cavity-coupled plasmonic device consists of a back mirror, an imprinted array of holes in a polymer, and a second evaporation of gold to create disks and a perforated film. Credit: Light: Science & Applications volume 7, Article number: 93 (2018)