Metamaterial-based electromagnetically induced transparency-like sensor design with low-volume sliding dielectric loadings

Abstract

Abstract In this study, tunability of the electromagnetically induced transparency (EIT)-like transmission window by low-volume dielectric loadings is presented both numerically and experimentally in S-band. The EIT-like transmission behavior is obtained by a metamaterial, composed of an electric resonator and a closed-ring resonator patterned on a dielectric substrate. The frequency tuning is obtained by two applications called horizontal sliding application (HSA) and vertical sliding application based on sliding of the low-volume loadings from the edges to geometric center (i.e., inward). For both applications, the frequency tuning has been investigated for dielectric loadings which have relative permittivity of 2.2, 3, 4.5, and 6.15. The results reveal that the proposed sliding applications are effective on tuning the transmission peak frequency. An achieved 1136 and 971 MHz absolute spectral shifts and corresponding 6.34% and 5.41% absolute sensitivities by simulations and measurements, respectively, are the best results which are obtained for HSA at 5 mm shift value. Moreover, 14.67% sensitivity is obtained in simulations for the complete dielectric loading on the resonator in response to the increase in refractive index from 1 to 1.5. It is believed that the proposed applications will contribute to the existent sensing studies.