Abstract
Spatial frequency filters, which can manipulate the angular spectrum of the incident electromagnetic waves, are significantly important in optical analog processing. Here, magnetic metamirrors with symmetric split-ring resonators, which are used to achieve short circuit for normally incident wave and impedance matching for obliquely incident wave, are fabricated and investigated. Our proposed metamirrors can be considered as high-stop spatial frequency filters, and their operation mechanisms are further revealed by the coupled-mode theory and equivalent transmission line model. The characteristics of the proposed metamirrors with gain media on top are predicted theoretically, and simulation results show that they can act as high spatial frequency amplifiers. Our design provides an alternative approach to spatial frequency filter design and has promising potential in the device design of optical analog processing.
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