Controlled Electric and Magnetic Hot Spots in All-Dielectric Metasurfaces with High-Q Resonances

The precise control over the locations of hot spots in a nanostructured ensemble is of great importance in enhanced spectroscopy, super-resolution optical imaging, sensors, slow light, and beam-steering devices. However, for all-dielectric multiparticle configurations, the locations of hot spots are difficult to predict due to the complex coupling of optical resonance modes. In this work, theoretical simulations based on all-dielectric metasurfaces with high-Q resonances predict that the locations of hot spots can be efficiently controlled in the nanorod-nanorod gaps or in the nanorod interior by suppressing or promoting specific-mode coupling effects in a specific polarization state of incident light. These findings offer an avenue to realize high-performance filters, sensors, and modulators for prompting applications.