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Modeling Metasurfaces Using Discrete-Space Impulse Response Technique
journal contribution
posted on 2020-03-19, 20:43 authored by Mahsa Torfeh, Amir ArbabiMetasurfaces are arrays of subwavelength
meta-atoms that shape
waves in a compact and planar form factor. Analysis and design of
metasurfaces require methods for modeling their interactions with
waves. Conventional modeling techniques assume that metasurfaces are
locally periodic structures excited by plane waves, restricting their
applicability to gradually varying metasurfaces that are illuminated
with plane waves. Here we introduce the discrete-space impulse response
concept that enables the development of accurate and general models
for metasurfaces. According to the proposed model, discrete impulse
responses are assigned to metasurface unit cells and are used to determine
the metasurface response to any arbitrary incident waves. We verify
the accuracy of the model by comparing its results with full-wave
simulations. The proposed concept and modeling technique are applicable
to linear metasurfaces with arbitrary meta-atoms, and the resulting
system-level models can be used to accurately incorporate metasurfaces
into simulation and design tools that use wave or ray optics.