Abstract
Lossless and reflectionless metasurfaces reported to date control radiation by imposing phase discontinuities onto a wavefront. As a result, a single metasurface of this type can control either the phase or the amplitude profile of a field at a particular plane. In this talk, compound metaoptics will be described that can independently manipulate the amplitude and phase profiles of a wavefront. The compound metaoptic consists of two passive metasurfaces that are lossless and reflectionless, and separated by a wavelength-scale distance. As shown in Figure 1, the first metasurface projects the correct power density onto the second metasurface, allowing beam shaping. The second metasurface provides a phase correction that allows beam steering. The proposed approach allows amplitude control without relying on loss (reflection, absorption, or polarization loss), as in earlier works.
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