研究目的
To propose and study a radially inhomogeneous (gradient-index) lens made of material with negative refractive index, invisible from the viewpoint of geometrical optics, and to analyze its scattering performance compared to a positive-index lens.
研究成果
The study proposes and analyzes a radially inhomogeneous lens with negative refractive index that is invisible from the viewpoint of geometrical optics. The lens's refractive index varies from -4 at the center to -1 at the surface. The study also compares the lens's scattering performance to that of a positive-index lens, finding differences in the conditions for invisibility and the depth of minima corresponding to invisibility.
研究不足
The study is based on geometrical optics, which is an approximate theory, and the invisibility of the lens is only from the viewpoint of geometrical optics. The study also focuses on a specific type of lens and may not be applicable to other lens designs.
1：Experimental Design and Method Selection:
The study involves the derivation and solution of an equation for determining the refractive index profile of the lens and the calculation of ray trajectories. Numerical analysis of electromagnetic wave propagation through the lens is performed using the hybrid projection method.
2：Sample Selection and Data Sources:
The study focuses on a cylindrical modification of the proposed lens illuminated by a plane wave.
3：List of Experimental Equipment and Materials:
The lens is made of material with a negative refractive index.
4：Experimental Procedures and Operational Workflow:
The study includes the derivation of the refractive index profile, calculation of ray trajectories, and numerical analysis of wave propagation through the lens.
5：Data Analysis Methods:
The scattering performance of the lens is analyzed using the hybrid projection method, and the results are compared to those of a positive-index lens.
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