Multi-frequency super-scattering from sub-wavelength graphene-coated nanotubes

Raad, Shiva Hayati; Zapata–Rodríguez, Carlos J.; Atlasbaf, Zahra

doi:10.1364/josab.36.002292

Cited by 23 publications

(15 citation statements)

References 29 publications

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“…2(c) one can distinguish a number of extrema of Z ϕϕ . This suggests that a single corrugated metasurface may enhance scattering from desired cylinder at several frequencies as does a multilayered coating [13,17]. As Fig.…”

Section: Superscattering Of the Tez Wavesmentioning

confidence: 84%

“…The situation is much the same for terahertz frequencies. In this frequency band, the plasmonic component of superscatterers can be replaced by conducting materials such as graphene [12,13] or hexagonal boron nitride (BN) [14], which can initiate resonance overlapping for different scattering modes. However, losses in these materials notably degrade the performance of such scatterers, making efficient superscattering practically elusive in the terahertz band.…”

mentioning

confidence: 99%

“…Note that multi-layered structures made of alternating plasmonic-dielectric [9][10][11]18], graphene-dielectric [12,13], BN-dielectric [14], dielectricdielectric [19] or metasurface-dielectric [17] layers represent the most common design solution for cylindrical superscatterers. This raises the following questions: Is it possible to realize a superscatterer of simpler design with a single surface (metasurface)?…”

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confidence: 99%

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Superscattering from Subwavelength Corrugated Cylinders

et al. 2020

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Wave scattering from a cylinder with a tensor impedance surface is investigated based on the Lorentz-Mie theory. A practical example of such a cylinder is a subwavelength metallic rod with helical dielectric-filled corrugations. The investigation is performed with the aim to maximize scattering cross-section by tailoring the surface impedance of cylindrical scatterers. For the normally incident TEz and TMz waves the required surface impedance of a subwavelength cylinder can be produced by longitudinal (axial) and transverse (circumferential) corrugations, respectively. It is shown that such corrugations induce superscattering at multiple frequencies, which can be widely tuned with either or both the size and permittivity of dielectric-filled corrugations. In the microwave band, this effect is demonstrated to be robust to material losses and is validated against the fullwave simulations and experiment. For the TEz waves the enhanced scattering from the cylinder is found to have a broad frequency bandwidth, provided that the relative permittivity of corrugations is low or equal unity. In the latter case, the corrugated cylinder acts as an all-metal superscatterer. For such cylinders the near-field measurements are implemented and provide the first experimental evidence of the superscattering phenomenon for all-metal objects. In addition to multifrequency superscattering, the dielectric-filled corrugations are shown to provide multifrequency cloaking of the cylinder under the incidence of the TMz waves. Simultaneous superscattering and cloaking at multiple frequencies distinguishes corrugated cylinders from other known practicable scatterers for potential applications in antenna designing, sensing, and energy harvesting.Enhancement of wave scattering from small objects is a vital issue in present-day technologies [1-7], including miniaturized antennas, sensors and energy harvesting devices. This issue is directly related to the natural constraint inherent in most subwavelength scatterers [8]. This constraint is known as a single-channel limit [9], which represents an upper limit to scattering crosssection for such scatterers and is attained under resonance condition for one of the scattering modes (channels). The only way to overcome this constraint is to ensure resonant scattering of several modes at a single frequency. Such a resonance overlapping magnifies scattering from a given object and is known as superscattering [9,10]. The larger the number of resonant modes, the larger the superscattering cross-section. Therefore, theoretically, superscattering opens a way to arbitrary enhancement of wave scattering from subwavelength objects. In practice, however, this effect is often hindered by the lack of low-loss materials and appropriate design solutions.In the infrared and visible parts of spectrum, the superscattering can be realized in cylindrical structures formed by several plasmonic and dielectric layers. In the pioneering work [9], for such a structure the total scattering cross-section was optimized to excee...

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Section: Superscattering Of the Tez Wavesmentioning

confidence: 84%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Superscattering from Subwavelength Corrugated Cylinders

et al. 2020

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“…Recently, increased interest in optical imaging, sensing, and energy harvesting at nanoscales has attracted renewed interest in the research of light scattering on the capability of engineering scattering spectra at will. Control of light scattering is shown in two extreme scattering anomalies: superscattering [6][7][8][9][10][11][12][13][14] and invisibility (cloak) [15][16][17][18][19][20][21][22][23][24][25][26]. Superscattering, which demonstrates an extraordinarily large scattering cross section (CS) far greater than that of the single-channel limit, has practical significance for applications such as imaging, biomedicine, and photovoltaics [3].…”

mentioning

confidence: 99%

“…However, due to the limited degree of freedom of design space, the interesting switching phenomenon is only observed at a particular wavelength. Although a multilayer configuration in principle can provide potential possibility toward multi-wavelength invisibility or superscattering [11,12,19], the multi-wavelength switching has never been reported before as the design process would be quite complicated when taking dispersions and phase changing of constitutions into consideration.…”

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confidence: 99%

Deep-learning-enabled inverse engineering of multi-wavelength invisibility-to-superscattering switching with phase-change materials

Luo

Zhang

et al. 2021

Opt. Express

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Inverse design of nanoparticles for desired scattering spectra and dynamic switching between the two opposite scattering anomalies, i.e. superscattering and invisibility, is an interesting topic in nanophotonics. However, traditionally the design process is quite complicated, which involves complex structures with many choices of synthetic constituents and dispersions. Here, we demonstrate that a well-trained deep-learning neural network can handle these issues efficiently, which can not only forwardly predict scattering spectra of multilayer nanoparticles with high precision, but also inversely design the required structural and material parameters quite efficiently. Moreover, we show that the neural network is capable of finding out multiwavelength invisibility-to-superscattering switching points at the desired wavelengths in multilayer nanoparticles composed of metals and phase-change materials. Our work paves a way of deep learning for the inverse design of nanoparticles with desired scattering spectra.

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Machine Learning for Engineering Meta‐Atoms with Tailored Multipolar Resonances

Li,

Barati Sedeh,

Tsvetkov

et al. 2024

Laser & Photonics Reviews

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In the rapidly developing field of nanophotonics, machine learning (ML) methods facilitate the multi‐parameter optimization processes and serve as a valuable technique in tackling inverse design challenges by predicting nanostructure designs that satisfy specific optical property criteria. However, while considerable efforts have been devoted to applying ML for designing the overall spectral response of photonic nanostructures, often without elucidating the underlying physical mechanisms, physics‐based models remain largely unexplored. Here, physics‐empowered forward and inverse ML models to design dielectric meta‐atoms with controlled multipolar responses are introduced. By utilizing the multipole expansion theory, the forward model efficiently predicts the scattering response of meta‐atoms with diverse shapes and the inverse model designs meta‐atoms that possess the desired multipole resonances. Implementing the inverse design model, uniquely shaped meta‐atoms with enhanced higher‐order magnetic resonances and those supporting a super‐scattering regime of light‐matter interactions resulting in nearly five‐fold enhancement of scattering beyond the single‐channel limit are designed. Finally, an ML model to predict the wavelength‐dependent electric field distribution inside and near the meta‐atom is developed. The proposed ML based models will likely facilitate uncovering new regimes of linear and nonlinear light‐matter interaction at the nanoscale as well as a versatile toolkit for nanophotonic design.

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Multi-frequency super-scattering from sub-wavelength graphene-coated nanotubes

Cited by 23 publications

References 29 publications

Superscattering from Subwavelength Corrugated Cylinders

Superscattering from Subwavelength Corrugated Cylinders

Deep-learning-enabled inverse engineering of multi-wavelength invisibility-to-superscattering switching with phase-change materials

Machine Learning for Engineering Meta‐Atoms with Tailored Multipolar Resonances

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