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Simultaneous perfect bending and polarization rotation of electromagnetic wavefront using chiral gradient metasurfaces
Physical Review Applied ( IF 4.532 ) Pub Date : 
Hamidreza Kazemi, Mohammad Albooyeh, and Filippo Capolino

We introduce chiral gradient metasurfaces that allow perfect transmission of the incident wave into a desired direction and simultaneous perfect rotation of the polarization of the refracted wave with respect to the incident one. In the lossless limit transmission can reach 100% with a single metasurface layer.} Besides using gradient polarization densities which provide bending of the refracted wave with respect to the incident one, using metasurface inclusions that are chiral allows the polarization of the refracted wave to be rotated. We suggest a possible realization of the proposed device by discretizing the required equivalent surface polarization densities, and synthesizing the chiral discrete polarizabilities with properly sized helical inclusions at each discretization point. By using only a single, optically thin, layer of chiral inclusions, we are able to unprecedentedly deflect a normal incident plane wave to a refracted plane wave at $45\lyxmathsym{\textdegree}$ with 72% power efficiency which is accompanied by a 90∘ polarization rotation. The proposed concepts and design method may find practical applications in polarization rotation devices at microwaves as well as in optics, especially when the incident power is required to be deflected.
更新日期:2020-01-14

 

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