研究目的
To design a bi-functional illusion device based on transformation optics that exhibits resizing and position-shifting features for both active and passive scatterers, depending on the shifting distance between physical space and shifting-region.
研究成果
The proposed bi-functional illusion device successfully achieves resizing and position-shifting effects for scatterers using homogeneous materials derived from linear coordinate transformations. It demonstrates versatility in functionality based on the shifting distance and mapping style, with potential applications in object protection and camouflage. Future work could focus on experimental realization and extending to 3D or other physical fields.
研究不足
The devices require negative and positive materials, which may be challenging to realize practically. The simulations are limited to 2D scenarios and specific frequencies. The homogeneity of materials is assumed, but real metamaterials might have limitations in achieving exact parameters.
1：Experimental Design and Method Selection:
The study uses linear coordinate transformation method from transformation optics to design the illusion device. The methodology involves mapping virtual space to physical space to control electromagnetic wave propagation.
2：Sample Selection and Data Sources:
The experiments involve simulations of electromagnetic fields for passive and active scatterers (e.g., dielectric objects and linear sources) placed in the core region of the device.
3：List of Experimental Equipment and Materials:
The primary tool is the COMSOL Multiphysics software for full-wave finite element method simulations. No physical equipment is mentioned; the work is computational.
4：Experimental Procedures and Operational Workflow:
The process includes defining coordinate transformations, calculating material parameters using Jacobian tensors, and simulating electric field distributions for transverse electric (TE) mode at GHz frequencies. Specific coordinate values are provided for imaginary and physical spaces.
5：Data Analysis Methods:
Simulation results are analyzed to validate the illusion effects, such as resizing, rotation, and relocation of scatterers, by comparing field patterns with and without the device.
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