Terahertz Chemical Sensor based on the Plasmonic Hexagonal Microstructured Holes Array in Aluminum

Terahertz Chemical sensor based on the hexagonal microstructure air holes in a free-standing Aluminum foil having a thickness $\sim $11 $\mu$ m has been designed by numerical simulations which is further optimized and fabricated by Computerized Numerical Control (CNC) drilling machine. Localized plasmons (LPs) excited at the air holes are used to demonstrate refractive index sensing for liquids. The proposed sensor would be a potential device for liquid sensing applications.