Chapter eight - Electromagnetically induced transparency in metasurfaces composed from silicon or ceramic cylindrical resonators

Abstract

This chapter describes the phenomenon of narrowband transparency, detected at electric resonances in metasurfaces (MSs) and composed of densely packed silicon/ceramic resonators. Characteristic features of this phenomenon allow for recognizing it as an analog of electromagnetically induced transparency discovered in atomic gases. Referring to similar phenomena observed in MSs and composed of metallic meanders, plasmonic resonators, or dielectric elements with intentionally complicated shapes, the chapter explores the nature of wave processes, whose interference could lead to full transparency of MSs formed by simple silicon/ceramic cylinders/disks. Fano-type spectral line shapes, known to be indicators of interference processes in MSs, have been revealed in the spectra of signals from electric field probes, sampled at specific locations within MS unit cells. The spectra of phase changes of these signals have been used for clarifying the processes, destructive interference of which could lead to suppressing the background radiation, thus providing conditions for full transparency of MSs.