# Strong interaction between graphene and localized hot spots in all-dielectric metasurfaces

## TL;DR

This paper demonstrates how integrating graphene into all-dielectric metasurfaces enables active control of Fano resonances through strong light-matter interactions at localized hot spots, advancing tunable nanophotonic devices.

## Contribution

It introduces a method to modulate Fano resonances in dielectric metasurfaces by incorporating graphene, allowing active tuning via Fermi level and layer number adjustments.

## Key findings

- Graphene integration significantly reduces Fano resonance strength.
- Tuning graphene's Fermi level modulates the resonance.
- Resonance can be switched off by adjusting graphene layers.

## Abstract

The active photonics based on the two-dimensional material graphene has attracted enormous interests for developing the tunable and compact optical devices with high efficiency. Here we integrate graphene into the Fano-resonant all-dielectric metasurfaces consisting of silicon split resonators, and systematically investigate the strong interaction between graphene and the highly localized hot inside feed gaps in the near infrared regime. The numerical results show that the integrated graphene can substantially reduce the Fano resonance due to the coupling effect between the intrinsic absorption of graphene with enhanced electric field in the localized hotspot. With the manipulation of the surface conductivity via varying Fermi level and the layer number of graphene, the Fano resonance strength obtains a significant modulation and is even switched off. This works provides a great degree of freedom to tailor light-matter interaction at the nanoscale and opens up the avenues for actively tunable and integrated nanophotonic device applications, such as the optical biosensing, slow light and enhanced nonlinear effects.