The effect of fabrication-imperfections on metalens performance

Metalenses are perfect lenses, at least they could be. In reality all kinds of fabrication imperfections and assembly errors reduce their performance. For real-life applications robust designs are needed so that the fabricated lenses perform within tolerance. Producers have to know which imperfections are critical and which deviations are acceptable. This interesting paper discusses the […]

Two approaches to making polarization insensitive metalenses using the Pancharatnam-Berry phase.

The Pancharatnam-Berry or geometric phase is widely used for making metalenses and metasurfaces. It allows for broadband performance and relatively straightforward design. In particular dielectric rectangular structures are widely used. One disadvantage of these anisotropic structures is that they require a circularly polarized incident light. Recently some papers have shown that a polarization insensitive metalens […]