Broadening the Bandwidth of Metamaterial Cloaks with Non-Foster Metasurfaces

@inproceedings{Chen2013BroadeningTB,
  title={Broadening the Bandwidth of Metamaterial Cloaks with Non-Foster Metasurfaces},
  author={Pai-Yen Chen and Christos Argyropoulos and Andrea Al{\'u}},
  year={2013}
}
We introduce the concept and practical design of broadband, ultrathin cloaks based on non-Foster, negatively capacitive metasurfaces. By using properly tailored, active frequency-selective screens conformal to an object, within the realm of practical realization, is shown to enable drastically reduced scattering over a wide frequency range in the microwave regime, orders of magnitude broader than any available passive cloaking technology. The proposed active cloak may impact not only… Expand
Bandwidth and size limits of achromatic printed-circuit metasurfaces.
TLDR
A common microwave metasurface geometry based on three metallic layers, separated by dielectric substrates is considered, and Foster's reactance theorem is applied to determine the bandwidth over which they are physically realizable using passive, causal and lossless structures. Expand
Controlling frequency dispersion in electromagnetic invisibility cloaks
TLDR
This work design and simulate a spherical cloak which takes into account the dispersive nature of relative permittivity and permeability tensors realized by plasma-like metamaterials and works over a broad frequency-band even though these materials are of a highly dispersion nature. Expand
Conformal metasurface-coated dielectric waveguides for highly confined broadband optical activity with simultaneous low-visibility and reduced crosstalk
TLDR
Jiang et al. demonstrate that a thin metasurface coating can control several optical properties simultaneously over a broad frequency range, offering new pathways for future miniaturization of dielectric waveguide-based systems with simultaneous polarization and scattering control. Expand
Metasurfaces and their applications
Abstract Metasurfaces are a topic of significant research and are used in various applications due to their unique ability to manipulate electromagnetic waves in microwave and optical frequencies.Expand
Broadband microwave metamaterial absorber with lumped resistor loading
Narrow absorption bandwidth has been a fundamental drawback hindering many metamaterial absorbers for practical applications. In this paper, by loading lumped resistors, we have successfully designedExpand
Multifunctional Metasurfaces: Design Principles and Device Realizations
In recent years, we have witnessed a rapid expansion of using super-thin metasurfaces to manipulate light or electromagnetic wave in a subwavelength scale. However, most designs are confined to aExpand
A review of dielectric optical metasurfaces for wavefront control
Abstract During the past few years, metasurfaces have been used to demonstrate optical elements and systems with capabilities that surpass those of conventional diffractive optics. Here, we reviewExpand
Active Cloaking of a Non-Uniform Scatterer
TLDR
The design and experimental demonstration of a low-profile, active cloak capable of concealing a complex, metallic, polygonal target is presented and demonstrates the feasibility of this kind of active cloaking for more complex scatterers containing flat surfaces and edges. Expand
Do Cloaked Objects Really Scatter Less
We discuss the global scattering response of invisibility cloaks over the entire frequency spectrum, from static to very high frequencies. Based on linearity, causality and energy conservation weExpand
Superdirective leaky radiation from a PT-synthetic metachannel.
TLDR
It is introduced here how the concept of CPAL action provoked in PT-symmetric metasurfaces can be translated into practical implementation of a low-loss zero/low-index open channel supporting a nearly undamped fast-wave propagation. Expand
...
1
2
3
...