Plasmon hybridization induced by quasi bound state in the continuum of graphene metasurfaces oriented for high-accuracy polarization-insensitive two-dimensional sensors

Plasmonics could provide compact and powerful solutions for manipulating light in deep-subwavelength dimensions, which is promising for a great range of nanophotonic technologies such as plasmonic rulers and sensors. However, the effective area of enhanced localized field induced by surface plasmon polaritons is typically restricted to the structural boundaries. In this work, we propose a method to generate high quality-factor extended electromagnetic fields via hybridizing the superradiant state and the quasi bound state in the continuum of graphene metasurfaces. The coupling interaction involved operates as a three-level system with multiple sharp resonances immune to the polarization, which holds great promise for developing nanodevices with high sensing capacity in two dimensions.

Automated summary

Plasmonics offers compact and powerful solutions for nanophotonic technologies but the effective area of enhanced localized field is limited by structural boundaries. This work presents a method to generate high quality-factor extended electromagnetic fields on graphene metasurfaces by hybridizing the superradiant state and the quasi bound state in the continuum, which holds great promise for developing nanodevices with high sensing capacity in two dimensions.