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Published on: December 27, 2012
Simplified ground plane invisibility cloak by multilayer dielectrics
Xiaofei Xu1, Yijun Feng, Zhenzhong Yu
1Department of Electronic Engineering, School of Electronic Science and Engineering, Nanjing Univeristy, Nanjing, 210093, China.
Optics Express
|December 18, 2010
Summary
This study introduces a novel ground plane invisibility cloak design using electromagnetic beam modulation blocks. This new method avoids the lateral shift issue found in previous designs, enabling better cloaking performance.
Area of Science:
- Electromagnetism and Optics
- Materials Science
Background:
- Conventional ground plane invisibility cloaks often use isotropic designs based on quasi-conformal transformations.
- Theoretical analysis indicates these isotropic cloaks suffer from unavoidable lateral shifts in scattering fields, compromising their detectability.
Purpose of the Study:
- To propose an alternative method for designing ground plane invisibility cloaks.
- To overcome the limitation of lateral field shifts inherent in previous cloak designs.
- To enable practical, non-magnetic cloaking solutions using readily available materials.
Main Methods:
- Utilized electromagnetic beam modulation blocks and coordinate transformation for cloak design.
- Employed rigorous transformation optics to achieve moderate anisotropic material parameters without lateral field shifts.
- Discretized the cloak into homogeneous sub-blocks realized by multilayer isotropic dielectrics with specific alignment angles determined by effective medium theory.
Main Results:
- Developed a ground plane cloak design with no lateral shift of scattering fields.
- Demonstrated the cloak's feasibility using multilayered normal dielectrics aligned at different angles.
- Validated performance through full-wave electromagnetic simulations, showing effective cloaking across various incident angles.
Conclusions:
- The proposed non-magnetic ground plane invisibility cloak, constructed from dielectric multilayers, offers a practical and experimentally feasible solution.
- The design effectively mitigates lateral scattering field shifts, enhancing cloaking performance.
- The cloak is suitable for applications across a wide frequency range, from microwave to optical frequencies.
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