Simple design of metamaterial sensor for biomedical sensing

Abstract Design a highly sensitive refractive index (RI) sensor based on perfect metamaterial absorber (PMA) in the terahertz region is reported. The design structure is formed of metal dielectric metal layered. The results of simulation show that the absorber has two resonance peaks with absorption rates 99.6% and 99.7%. The physical origin of the two band absorber is investigated by near-field distribution. The proposed design sensing performance determined by two important parameters, sensitivity (S) and figure of merit (FOM). In this work, the sensitivity and figure of merit (FOM) can reach 0.86 THz/RIU and 61.8 which is much higher than the previous work in terahertz region. The design RI sensor can be fitted for biomedical sensing applications such cancerous cell detection as the RI varied in the range of 1.35 to 1.402.