# Strong coupling between a plasmonic Fano resonance and anapole states in a metallic-dielectric antenna

## TL;DR

This paper demonstrates a hybrid metallic-dielectric antenna that achieves strong light-matter coupling, resulting in enhanced field effects and tunable resonance splitting, promising for miniaturized photonic devices.

## Contribution

It introduces a novel hybrid antenna combining plasmonic Fano resonance and anapole states, enabling large tunable Rabi-splitting and reduced losses through strong coupling.

## Key findings

- Achieved over 300 meV Rabi-splitting energy.
- Demonstrated tunability of resonance wavelength via gap size.
- Enhanced decay rates suitable for optical device applications.

## Abstract

In the quest to enhance light-matter interactions and miniaturize photonics devices, it is crucial to create a strong field enhancement with lower material losses. Here we combine a plasmonic Fano resonance supported by the silver cluster and anapole states realized by the silicon disk to create a larger field enhancement with less loss through a strong coupling effect. Besides, by varying the gap size we find that the resonances wavelength and the Rabi-splitting can be tuned over a wide range of wavelength, which can achieve a giant splitting energy over 300 meV. We further demonstrate that it is the interference of magnetic currents loops which induces the strong coupling. Due to the strong coupling, the hybrid antenna can provide both larger decay rate and radiative decay rate, which makes it promising for high-performance miniaturized optical devices.