Transparency window in the THz frequency based on asymmetric dark-dark modes interaction

Abstract

In this study, we investigate the impact of asymmetry on plasmonic-induced transparency (PIT) in structures with double dark modes. We have identified the ideal structural parameters for the single and double asymmetric dark mode structures, and it has been demonstrated that the usage of these factors improves sensing performance. The suggested structure is made up of a number of parallel black phosphorus nano-ribbons (BPNRs) with similar length, and it has been found that double asymmetric dark-dark systems creates a more stable and consistent transparency window, making it a strong contender to serve as a refractive index sensor. The proposed structure is simple and easy to manufacture, making it a more viable design for refractive index sensors for the terahertz range.