Abstract
We present the concept of a magnetless reflective gyrotropic spatial isolator (RGSI) metasurface. This is a birefringent metasurface that reflects vertically polarized incident waves into a horizontally polarized waves, and absorbs horizontally polarized incident waves, hence providing isolation between the two orthogonal polarization. We first synthesize the metasurface using surface susceptibility-based generalized sheet transition conditions. We then propose a mirror-backed metaparticle implementation of this metasurface, where transistor-loaded resonators provide the desired magnetless nonreciprocal response. Finally, we demonstrate the metasurface by full-wave simulation results. The proposed RGSI metasurface may be used in various electromagnetic applications, and may also serve as a step towards more sophisticated magnetless nonreciprocal metasurface systems.
Highlights
Nonreciprocity is a fundamental concept in science and technology [1, 2]
We present the concept of a magnetless reflective gyrotropic spatial isolator (RGSI) metasurface
The proposed RGSI metasurface may be used in various electromagnetic applications, and may serve as a step towards more sophisticated magnetless nonreciprocal metasurface systems
Summary
Nonreciprocity is a fundamental concept in science and technology [1, 2] It allows special operations, such as isolation, circulation, nonreciprocal phase shifting and nonreciprocal gyrotropy, that are crucial in a great variety of applications. The concept of magnetless nonreciprocity has arisen as a potential solution to these issues [5], with the transistor-loaded structures [6,7,8,9,10,11,12,13,14,15,16] and spacetime-modulated systems [17,18,19,20,21,22,23] being the main practical approaches. Transistor-loaded nonreciprocal metasurfaces have been demonstrated realizing nonreciprocal polarization rotators in reflection [9] and in transmission [10], transmissive isolation using an antenna-circuit-antenna approach [14], bianisotropic nonreciprocity [13] and meta-grating reflective circulators [16]
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