Focusing the optical radiation emitted by systems based on photonic crystals

摘要

Methods for focusing electromagnetic radiation using two-dimensional photonic crystals are discussed. The main feature of the described methods is the use of structures of finite dimensions, which determine the feasibility and efficiency of focusing. In this case, the physical mechanisms underlying the considered methods of localizing the field in a limited region of space are significantly different. These mechanisms include the unusual reflection and refraction properties of metallic photonic crystals, which exhibit the properties of media with ultralowvalues of the refractive index at the frequencies of the first allowed zone, and diffraction effects at the edges of dielectric photonic crystal structures. (C) 2021 Optical Society of America