Confined transverse electric phonon polaritons in hexagonal boron nitrides

Renuka, Maturi; Lin, Xiao; Li, Rujiang; Wang, Huaping; Li, Er‐Ping; Zhang, Baile; Musa, Muhyiddeen Yahya

doi:10.1088/2053-1583/aa9643

Cited by 37 publications

(40 citation statements)

References 33 publications

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“…The subwavelength structure, constructed by three conformal and dielectric-separated metasurfaces rolled in a cylinder shape [see Fig. 1(a)], supports degenerate resonances of confined transverse electric (TE, or s-polarized) surface waves [23][24][25][26]. Importantly, we observe degenerate resonances simultaneously in two different frequency ranges, verifying the prediction of multifrequency superscattering [19].…”

supporting

confidence: 79%

Experimental Observation of Superscattering

et al. 2019

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Superscattering, induced by degenerate resonances, breaks the fundamental single-channel limit of scattering cross section of subwavelength structures; in principle, an arbitrarily large total cross section can be achieved via superscattering. It thus provides a unique way to strengthen the light-matter interaction at the subwavelength scale, and has many potential applications in sensing, energy harvesting, bio-imaging (such as magnetic resonance imaging), communication and optoelectronics. However, the experimental demonstration of superscattering remains an open challenge due to its vulnerability to structural imperfections and intrinsic material losses. Here we report the first experimental evidence for superscattering, by demonstrating the superscattering simultaneously in two different frequency regimes through both the far-field and near-field measurements. The underlying mechanism for the observed superscattering is the degenerate resonances of confined surface waves, by utilizing a subwavelength metasurface-based multilayer structure. Our work paves the way towards practical applications based on superscattering.

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confidence: 79%

Experimental Observation of Superscattering

et al. 2019

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supporting

confidence: 76%

A Metamaterial for Superscattering Light

Liu

2019

Physics

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Superscattering, induced by degenerate resonances, breaks the fundamental single-channel limit of the scattering cross section of subwavelength structures; in principle, an arbitrarily large total cross section can be achieved via superscattering. It thus provides a unique way to strengthen the light-matter interaction at the subwavelength scale, and has many potential applications in sensing, energy harvesting, bioimaging (such as magnetic resonance imaging), communication, and optoelectronics. However, the experimental demonstration of superscattering remains an open challenge due to its vulnerability to structural imperfections and intrinsic material losses. Here we report the first experimental evidence for superscattering by demonstrating the superscattering simultaneously in two different frequency regimes through both the far-field and near-field measurements. The underlying mechanism for the observed superscattering is the degenerate resonances of confined surface waves, by utilizing a subwavelength metasurface-based multilayer structure. Our work paves the way towards practical applications based on superscattering.

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“…~22.3-24.5 THz), and is a type-II hyperbolic material ( and ) within the second reststrahlen band (~41.1-48.2 THz). 11,12, [28][29][30][31][32] Below experimental data of the bulk layered BN, 31,32 i.e., with the consideration of realistic loss, are used to characterize the permittivity of BN. It shall be emphasized that when the thickness of BN decreases down to monolayer, the optical properties (especially the material loss) of BN can change remarkably.…”

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confidence: 99%

“…Within the two reststrahlen bands, BN can support the propagation of highly-confined hyperbolic phonon polaritons, which have been extensively studied. 11,12, [28][29][30][31][32] Under the incidence of a transverse-magnetic (TM, or p-polarized) plane wave, the total magnetic field in the surrounding air region can be expressed as 14,37…”

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confidence: 99%

Multifrequency Superscattering from Subwavelength Hyperbolic Structures

et al. 2018

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Superscattering, i.e., a phenomenon of the scattering cross section from a subwavelength object exceeding the single-channel limit, has important prospects in enhanced sensing/spectroscopy, solar cells, and biomedical imaging. Superscattering can be typically constructed only at a single frequency regime, and depends critically on the inescapable material losses. Under such realistic conditions, superscattering has not been predicted nor observed to exist simultaneously at multiple frequency regimes. Here we introduce multifrequency superscattering in a subwavelength hyperbolic structure, which can be made from artificial metamaterials or from naturally-existing materials, such as hexagonal boron nitride (BN), and show the advantage of such hyperbolic materials for reducing structural complexity. The underlying mechanism is revealed to be the multimode resonances at multiple frequency regimes as appear in BN due to the peculiar dispersion of phonon-polaritons. Importantly, the multifrequency superscattering has a high tolerance to material losses and some structural variations, bringing the concept of multifrequency superscattering closer to useful and realistic conditions.

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Confined transverse electric phonon polaritons in hexagonal boron nitrides

Cited by 37 publications

References 33 publications

Experimental Observation of Superscattering

Experimental Observation of Superscattering

A Metamaterial for Superscattering Light

Multifrequency Superscattering from Subwavelength Hyperbolic Structures

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