Description
Research on metasurface lenses has been concentrated in the past on uniform structures and on very slowly varying metasurface characteristics. The results obtained show, however, that it is only when the variation rate becomes comparable with the wavelength that it is possible to achieve a wide control of the metasurface properties and therefore of the transmission and reflection properties of the lens.
This activity addressed modulated metasurface lenses designed to achieve beam shaping, with very low reflection and transmission losses, while having a very small thickness, compared to wavelength. The latter feature being expected to make them quite attractive for many applications, especially for space where mass and volume are a critical element. The activity delivered a design methodology for ultra-thin metasurface lenses and the results achieved are currently being applied in the frame of an ARTES AT activity.
