研究目的
Extending the susceptibility-GSTC synthesis method from planar to spherical metasurfaces to explore their unique properties and validate the method with examples.
研究成果
The paper successfully extends the GSTC synthesis method to spherical metasurfaces, highlighting their unique properties due to non-zero intrinsic curvature. Three examples validate the method, demonstrating exotic transformations. This work paves the way for studying other canonical shapes and irregular metasurfaces using GSTCs and conformal mapping techniques.
研究不足
The study is restricted to re?ection-less spherical metasurfaces excited from the inside to avoid multiple internal scattering. It does not address general porous cavities or edge diffraction in spherical caps. The validation uses monoanisotropic metasurfaces due to software limitations, and the synthesis may involve susceptibility variations that are challenging to sample with typical subwavelength particles.
1：Experimental Design and Method Selection:
The methodology involves extending the bianisotropic susceptibility GSTC synthesis method to spherical metasurfaces, using theoretical models derived from Maxwell's equations and GSTCs.
2：Sample Selection and Data Sources:
The study uses theoretical field specifications for incident, reflected, and transmitted fields in spherical coordinates, with examples including illusion transformation, ring focusing, and birefringence.
3：List of Experimental Equipment and Materials:
No specific equipment is mentioned; the work is theoretical and validated with full-wave simulations using COMSOL software.
4：Experimental Procedures and Operational Workflow:
The synthesis involves deriving susceptibility tensor functions from field specifications, followed by validation through full-wave simulations in COMSOL by modeling surface susceptibilities as volume-diluted susceptibilities in a subwavelength spherical shell.
5：Data Analysis Methods:
Analysis includes comparing synthesized susceptibility functions with simulated field transformations using FEM-based software COMSOL.
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