Multiple coil-type Fano resonances in all-dielectric antisymmetric quadrumers

In this study, we examined the optical properties of an antisymmetric quadrumer composed of silicon (Si) nanodisks that are located in a close proximity to each other as a molecular cluster. Considering the magnetic response of the presented cluster and modifying the geometrical sizes of employed nanodisks, we calculated the extinction cross-sectional profile in a numerical methods by using two-dimensional finite-difference time-domain model. We verified that proposed configuration can be tailored to support multiple strong and deep coil-type Fano resonances without significant radiation losses. Comparing the performance of the structure with analogous metallic nanoclusters, the superior behavior of the investigated quadrumer is evaluated and confirmed. We verified that localized magnetic fields can be exploited to intensify the energy of produced hot-spots.