Ultra-high Q, dual-band all-dielectric metamaterial terahertz sensor based on quasi-bound state in the continuum for virus detection

Conventional diagnostic techniques often face challenges related to sensitivity and specificity, which may result in an inability to obtain an accurate diagnosis. To address these issues, the research focus has shifted to the development of biosensors with high sensitivity and selectivity. We develop a dual-band all-dielectric metamaterial sensor with ultra-high Q capable of detecting specific biological viruses. A double-layered structure with dual hollow cylindrical shapes was used, and the inner and outer radii of the hollow cylinder on the right were modified to break symmetry, inducing a dual-bound state in the continuum (BIC) effect. The effect of structural parameters on Fano resonance is also studied. The spectral response of the medium’s refractive index was calculated, resulting in Fano resonances with Q-factors of 1674 and 2244, respectively. This work has potential applications in the terahertz range, mainly in ultra-high-sensitivity sensing chips in the medical field, and provides valuable insights into quasi-BIC-based biosensors. Its potential to detect a wide range of viruses, including Hepatitis B Virus (HBV) and H9N2 et al., holds promise for advancing biosensing applications.