Simulation and experimental responses of the asymmetric split ring resonators (A-SRRs) for sensing applications in the mid-infrared region

In this paper, both simulated and experimental measurements on arrays of asymmetric split-ring resonators (A-SRRs) with varying diameters are reported. Their responses appear in the mid-infrared (IR) spectral region and match well with the vibrational resonances of many organic molecules. Such structures can be used to detect protein molecules in their native biological environments. The use of a zinc selenide (ZnSe) substrate facilitates measurement of transmission spectra at wavelengths in the mid-IR.