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Recently, gradient metasurfaces, have paved a new direction to the field of metamaterial with many remarkable achievements, including generalized Snell's law [1], new bridge to couple surface wave [2], meta-holograms [3], planar optical devices [4, 5], etc‥ In spite of these great developments, there are some aspects of the metasurfaces needed to be improved. For example, most of the previous systems...
In this work, we demonstrate theoretically and experimentally that a specific gradient-index meta-surface can convert a PW to a SW with nearly 100% efficiency. Distinct from conventional devices such as prism or grating couplers, the momentum mismatch between PW and SW is compensated by the reflection-phase gradient of the meta-surface, and a nearly perfect PW-SW conversion can happen for any incidence...
An approach to studying composite EM scattering from 2-D rough surface and half-buried 3-D target is proposed in this paper, from accurate geometry modeling to RCS analysis. First, two dimensional rough surface is simulated with spectral method, which then is converted into a continuous curved surface through inverse engineering. Target model and rough surface model are combined together to be a very...
It is consume much time for hidden surface removal when compute the scattering of electrically large object by physical optics method. In this paper, a fast hidden surface removal algorithm is presented. First, the planar triangles covering the body surface are divided into several groups. The characteristic vectors of each groups is selected. Then, the dot product of the characteristic vectors and...
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