All-dielectric optical nanoantennas

Control of light at the nanoscale is demanding for future successful on-chip integration. At the subwavelength scale, the conventional optical elements such as lenses become not functional, and they require conceptually new approach for a design of nanoscale photonic devices. Recently, a new field of optical nanoantennas emerged offering most promising solutions to this problem. Most optical nanoantennas consist of plasmonic nanoparticles due to their ability to capture and concentrate visible light at subwavelength dimensions. But the main drawback in the visible frequency range is their intrinsic losses which affect strongly the overall performance of plasmonic structures limiting their scalability and practical use.