| 초록 |
A metal-insulator-metal (MIM) structure for diverse liquids was proposed to achieve high environmental sensitivity of colors enough to be conceivable by naked eyes through the change of the physico-optical properties of the insulator layer. Subwavelength nano-apertures, allowing not only selective etching of the underneath insulator layer but also liquid infiltration to the insulator layer, were constructed using a single step of metal deposition in a nanoscale plasmonic geometry. Such device architecture enables to achieve the wavelength shift as large as 323.5 nm RIU-1 in the visible region, which is the largest wavelength shift reported so far. Our scientific findings indeed provide the dramatic color changes, the real-time sensing scheme, the long-term durability, and the reproducibility in a simple and scalable manner. |
