Abstract

In this study, we propose and investigate a generalized circuit model for metasurface high-sensitivity sensors and broadband absorbers. First, we propose a terahertz tunable and polarization-independent high-sensitivity sensor based on a bulk Dirac semimetal metasurface. We compare the results of the proposed circuit model with those of full-wave simulation. In addition, we achieve the spectra of the sensor absorption for healthy and cancer cells. Moreover, since for most practical applications, the absorption bandwidth is one of the most substantial metrics, we propose a broadband absorber in the wavelength range of 600 to 800 nm. To verify our proposed model, we compare the results of the circuit model with those of experimental data. Additionally, a good agreement is observed among the results of the circuit model, those of full-wave simulations, and the experimental data. The proposed circuit model is general. It provides physical insight into the design and operation of various sub-wavelength structures in the broad frequency range. In addition, the proposed sensor can be used as a platform for the design of sensors needed in various chemical and biomedical systems.

© 2020 Optical Society of America

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