.png){kind=icon}
.png){kind=icon}
Return
Multiband Omnidirectional Invisibility Cloak
.png){kind=icon}
OA
AI
DOI：10.1002/advs.202401295.png)
.png){kind=icon}
.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Transformation optics (TO) provides a powerful tool to manipulate electromagnetic waves, enabling the design of invisibility cloaks, which can render objects invisible. Despite many years of research, however, invisibility cloaks experimentally realized thus far can only operate at a single frequency. The narrow bandwidth significantly restricts the practical applications of invisibility cloaks and other TO devices. Here, a general design strategy is proposed to realize a multiband anisotropic metamaterial characterized by two principal permittivity components, i.e., one infinite and the other spatially gradient. Through a proper transformation and combination of such metamaterials, an omnidirectional invisibility cloak is experimentally implemented, which is impedance-matched to free space at multiple frequencies. Both far-field numerical simulations and near-field experimental mappings confirm that this cloak can successfully suppress scattering from multiple large-scale objects simultaneously at 5 and 10 GHz. The design strategy and corresponding practical realization bring multiband transformation optical devices one step closer to reality. Previous invisibility cloaks experimentally realized thus far can only operate at a single frequency. This study reports a multiband omnidirectional invisibility cloak in free space. The cloak uses a nonmagnetic inhomogeneous anisotropic metamaterial working at Fabry-P & eacute;rot resonances to replace the transformation-invariant metamaterial involved in the coordinate transformation, achieving nearly perfect impedance matching and phase restoration in both C and X bands. image
Keywords:
Fabry-P & eacute
rot resonance
multiband
nonmagnetic
omnidirectional invisibility cloak
AI Summary
Key information extracted from the uploaded paper, including a brief overview, abstract, background, key highlights, visual analysis, and future outlook.
Journal
IF:
14.1
Papers:
1.8W
Citations:
11.5W