Search

An electromagnetically induced transparency (EIT) analog in hybrid metal–dielectric metamaterials is proposed and numerically demonstrated in the terahertz region. The EIT analog consists of a metal bar and a silicon disk (SD) to support localized surface plasmon resonance and anapole modes. A high transmission EIT-like optical response was achieved with a Q-factor of ∼250 as interpreted by the destructive interference between these two modes through the hybrid metamaterial. The influences of the background index and SD radius on the hybrid metamaterial are also demonstrated. In addition, the proposed metamaterial has the potential to be integrated into microfluidic chips for tumor, pesticide, and poison sensing, which gives a new way to realize EIT in a way that is different using all-metal and all-dielectric materials.

Inspired by the development of terahertz (THz) technology, the demand for THz sensors with high quality and high sensitivity is significantly increasing. In this study, one-dimensional metallic metamaterials based on cavity mode resonance are proposed for sensing applications in the THz regime. Owing to the strong energy concentration in the cavity, metamaterials with a high quality factor were obtained. Thus, the presented device not only achieved narrowband selective absorption but also exhibited excellent refractive index sensing with high sensitivity, figure of merit, and quality factor. The physical mechanism was verified by comparing the simulation results with that of the coupled mode theory. The polarization dependence of absorption and dual-band sensing, which can be actively tuned by the broken symmetry between two adjacent units, were also discussed. Consequently, this study may open up new avenues for the development of biosensing and imaging applications.