Graphene slow-light sensor based on dual plasmonic induced transparency effect
Abstract
<p indent="0mm">Graphene plasmons hold significant promise for optoelectronic device design due to their exceptional physical properties and tunability. This study introduces a terahertz metamaterial device leveraging graphene micro-nanostructures to achieve plasmonic induced transparency (PIT) and slow-light effects. The device’s functionality relies on precise control of the graphene Fermi level and periodic arrangement of micro-nanostructures. It integrates a single-layer graphene sheet into a silicon dielectric medium, utilizing metallic electrodes for dynamic Fermi level regulation. Compared to existing slow-light devices, this design exhibits a higher group refractive index (up to 366), enhanced tunability, and a notable blue shift in resonance frequencies at specific wavelengths, collectively enhancing slow-light performance. Numerical simulations elucidate the dual PIT mechanism and its influence on light propagation dynamics. Beyond superior dynamically tunable slow-light capabilities, the device also demonstrates exceptional sensing performance with a maximum sensitivity of <sc>1.892 THz/RIU.</sc> This study provides new methodologies and theoretical foundations for developing high-performance optoelectronic devices, including optical sensors, optical switches, modulators, and slow-light devices.</p>
