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All-dielectric carpet cloaks with three-dimensional anisotropy control
Yuki Maegawa1, Yosuke Nakata1,2, Atsushi Sanada1
1Graduate School of Engineering Science, Osaka University, Toyonaka, Japan.
Nanophotonics (Berlin, Germany)
|December 5, 2024
Summary
This study introduces 3D-printable dielectric carpet cloaks using jungle gym unit cells for polarization-independent cloaking. The novel design strategy ensures effective cloaking across various angles and frequencies, confirmed by numerical and experimental validation.
Area of Science:
- Metamaterials and Nanophotonics
- Electromagnetics and Wave Phenomena
Background:
- Transformation optics enables the design of advanced electromagnetic devices.
- Controlling material anisotropy is crucial for achieving complex optical functionalities.
Purpose of the Study:
- To propose and demonstrate all-dielectric carpet cloaks with 3D anisotropy control.
- To develop a design strategy for polarization-independent and angle-versatile cloaking.
Main Methods:
- Utilizing jungle gym shaped dielectric unit cells for cloak fabrication.
- Employing quasi-conformal coordinate transformation for cloak design.
- Numerical simulations and experimental evaluations at microwave frequencies (10 GHz).
Main Results:
- Achieved polarization-independent 3D cloaking with arbitrary incident angles.
- Demonstrated effective suppression of non-specular reflections for TE and TM waves.
- Confirmed frequency-independent cloaking performance in the X-band.
Conclusions:
- The proposed design strategy enables robust 3D carpet cloaking using all-dielectric materials.
- Stereolithography 3D printing offers a viable fabrication method for these cloaks.
- The validated design method paves the way for practical applications of advanced cloaking technologies.
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