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A Terahertz Electromagnetically Induced Transparency-Like Metamaterial for Biosensing

In this paper, we proposed a metamaterial structure that exhibits electromagnetically induced transparency-like (EIT-like) Fano resonance. The structure is consisting of asymmetric split-ring resonators in which, by increasing the asymmetry, a transparency window occurs with a peak at 1.94 THz. The electromagnetic field distribution and surface current flow is studied and also the EM simulation result of the transmission spectra is validated through the theoretical calculation of the coupled harmonic oscillators model. It proves that by changing the asymmetry degree from 12 to 20 µm, non-radiation damping decreases from 11.7 to 6, and the coupling coefficient improves from 2.2 to 3.7. Furthermore, the potential of the structure for an ultra-sensitive, non-label, and low-cost biosensor is investigated. For this aim, by applying an analyte with a thickness of 18 µm, a remarkable theoretical sensitivity of 550 GHz/RIU along with a narrower FWHM and a higher Q factor of 6.46, is achieved.