Photonics, Volume 7, Issue 2 (June 2020) – 22 articles
Cover Story (view full-size image): A new conceptual platform for nonreciprocal space wave manipulation with unitary efficiency beyond the limits dictated by Lorentz reciprocity is introduced. The proposed concept is based on nonreciprocal metagratings composed of stationary bianisotropic inclusions synthesizing real moving media. As an example of nonreciprocal wave manipulation, the figure shows nonreciprocal circulation for space waves. The proposed platform does not require continuous profile of spatiotemporal modulation, but it simply consists of a periodic array of identical bianisotropic inclusions. In the proposed concept, there is no fundamental limit on conversion efficiency and no up- or downconversion of frequency happens. The period in the array is comparable to the wavelength, avoiding severe challenges to translate these concepts to higher frequencies. View this paper.
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