Design and Analysis of a Metalens

A lens is a transmissive optical device that focuses or defocuses light by changing its phase. Unlike conventional lenses, metalenses have the advantage of being able to achieve the desired phase change in a very thin layer using structures with sizes in the order of the wavelength and below, without the need for a complex and voluminous lens group. In this example, we showcase the design process of a metalens using cylindrical dielectric nanopillars. Owing to its nanoscale structure and high refractive index contrast, full vectorial modelling of the electromagnetic field is essential. For the initial configuration, parameters from E. Bayata’s work are used.