부산대학교 도서관

Metallic colorimetric optical nanosensors based on surface plasmon resonances have been the target of an intensive R&D activity, owing to the large number of applications in pressure-, refractive index-, biomolecular-sensing just to name a few. In this work, we address optical pressure/temperature nanosensor by designing and numerically simulating Metal/Insulator/Metal (MIM) nanopillar arrays covered by a metallic film. The gap plasmon frequency is highly sensitive to the distance of the pillars to the Ag film, which allows optical sensing of pressure/ambient temperature by the change in color of the device. Simulation results show that the profile of the reflectance dip in the spectra, which determines the color of the structure, strongly shifts with the distance between the nanopillars and the metallic film. Importantly, a clear reflectance dip shift can be achieved even upon a nanometric displacements. The color change could be used to indicate the external environmental change, such as actuating optical pressure or the ambient temperature where the sensor is located. Moreover, the sensor has extensive potential application in chemical, biological, environmental, and medical sensing, as well as in manufacturing.