Superscattering of Light from Subwavelength Nanostructures

Ruan, Zhichao; Fan, Shanhui

doi:10.1103/physrevlett.105.013901

Cited by 379 publications

(429 citation statements)

References 26 publications

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“…When one or more whispering-gallery-like modes satisfy the Bohr condition (similar to the whispering gallery condition in Refs. [13], [14]), the localized electromagnetic fields interfere constructively, and the scattering cross sections are enhanced with resonance peaks accordingly.…”

Section: Bohr Model For Graphene Based Structuresmentioning

confidence: 99%

“…Besides, the concept of "surface superscatterers" is also proposed, where the scattering cross section of a deep-subwavelength dielectric cylinder is enhanced by a monolayer graphene sheet which is only one atom thick [11], [12]. Moreover, the scattering cross sections of subwavelength superscatterers can be further enhanced by overlapping the resonances from different scattering terms [13], [14], [15], [16], [17], [18], [19], [20]. Since compact superscatterers are more promising in the miniaturization and integration of plasmonic devices, it is quite necessary to design superscatterers by overlapping different resonance peaks in the deepsubwavelength scale.…”

Section: Introductionmentioning

confidence: 99%

“…Since the degeneracy between |s n | and |s −n | are considered in Eq. (6), the NSCS has a single channel limit δ n for the nth angular momentum channel [13]. While for the waveguide model in Fig.…”

Section: Bohr Model For Graphene Based Structuresmentioning

confidence: 99%

“…1(a) and (b). The incident x-polarized plane wave excites different orders of TM whispering-gallery-like modes along the graphene surface [13], where the modes can be approximated by the TM plasmonic modes in equivalent planar waveguide since the penetration depth of graphene plasmon is smaller than the radius of the cylindrical graphene layer. When one or more whispering-gallery-like modes satisfy the Bohr condition (similar to the whispering gallery condition in Refs.…”

Section: Bohr Model For Graphene Based Structuresmentioning

confidence: 99%

“…However, this kind of resonances are caused by the resonance of a single scattering term, while the contributions from different scattering terms can be overlapped to further enhance the scattering cross sections [13], [14]. Due to the complexity of scattering models, the genetic algorithm has been used to optimize the superscattering of light where different resonance peaks are overlapped [20].…”

Section: Dispersion Engineeringmentioning

confidence: 99%

See 4 more Smart Citations

Design of Ultracompact Graphene-Based Superscatterers

Zheng

Lin

et al. 2017

IEEE J. Select. Topics Quantum Electron.

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Abstract-The energy-momentum dispersion relation is a fundamental property of plasmonic systems. In this paper, we show that the method of dispersion engineering can be used for the design of ultra-compact graphene-based superscatterers. Based on the Bohr model, the dispersion relation of the equivalent planar waveguide is engineered to enhance the scattering cross section of a dielectric cylinder. Bohr conditions with different orders are fulfilled in multiple dispersion curves at the same resonant frequency. Thus the resonance peaks from the first and second order scattering terms are overlapped in the deepsubwavelength scale by delicately tuning the gap thickness between two graphene layers. Using this ultra-compact graphenebased superscatterer, the scattering cross section of the dielectric cylinder can be enhanced by five orders of magnitude.

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Section: Bohr Model For Graphene Based Structuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Bohr Model For Graphene Based Structuresmentioning

confidence: 99%

Section: Bohr Model For Graphene Based Structuresmentioning

confidence: 99%

Section: Dispersion Engineeringmentioning

confidence: 99%

See 3 more Smart Citations

Design of Ultracompact Graphene-Based Superscatterers

Zheng

Lin

et al. 2017

IEEE J. Select. Topics Quantum Electron.

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Nanoscale Photovoltaics

Mann,

Alarcón‐Lladó

2024

Photovoltaic Solar Energy

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Symmetry‐Broken Metamaterial Absorbers as Reflectionless Directional Couplers for Surface Plasmon Polaritons in the Visible Range

Fan

Burns

Naughton

2014

Advanced Optical Materials

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directional coupling between propagating photons and surface plasmon polaritons (SPPs) in the visible range is a growing pursuit, due to its perceived essential role in nanoplasmonic and nanophotonic applications. [11][12][13] Here, we demonstrate that asymmetric, two-element, periodic, metal-insulator-metal (MIM) structures, perhaps representing the simplest gradient-index scenario, can serve as refl ectionless directional converters between free photons and SPPs operable in the visible frequency range. The simplicity of this two-element MIM structure allows for the fabrication of testable samples for operation with visible light. Simulated dispersion relations of this structure reveal the nature of the high-effi ciency coupling process: interactions between propagating modes caused by the broken refl ection symmetry (RS) and localized modes generated by individual MIM elements that are well understood in the language of MM "perfect absorbers". [ 14,15 ] There are regions in k -space where these interactions are very strong, such that the two modes hybridize to two new quasi-particles, [ 16,17 ] with concomitant Rabi splitting. [ 18,19 ] Experiments on samples with tuned parameters confi rm the simulated dispersion maps, and demonstrate a large Rabi splitting. Absolute refl ectance measurements under normal incidence with small aperture angle (3.75°) on samples with areas less than 60 × 60 µm 2 were carried out using a modifi ed microscope design. This scheme avoids the common problem of averaging over large incident angles when measuring optical properties of small-area samples by conventional methods. [ 20 ] Direct experimental evidence is obtained for refl ectionless (less than 8% measured refl ectance) directional SPP coupling in the visible range, with more than 88.8% of the channeled SPP energy being directed to the designed direction. Our results are meaningful for integrated nanoplasmonics, plasmonic logic, and plasmonic light harvesting, among others. Results and Discussions Localized Mode AnalysisUsing the measurement scheme described in Experimental Section, we performed refl ectance measurements to study Gradient-index meta-surfaces have been shown to have the ability to manipulate wavefronts at will in a refl ectionless manner in the GHz range, including the extreme example of converting freely propagating waves into surface waves with high effi ciency. Upon approaching the optical regime, the gradient-index concept encounters diffi culties due to fabrication limitations. Here, it is theoretically and experimentally demonstrated that asymmetric, periodic, two-element metal-insulator-metal structures can serve as refl ectionless directional converters between freely propagating visible photons and surface plasmon polaritons (SPPs). Coupling between propagating modes caused by the broken symmetry and localized modes generated by individual elements is shown to be the mechanism of this high-effi ciency process, yielding an observed Rabi splitting of ∼135 meV. Direct experimental evidence is obtained fo...

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Superscattering of Light from Subwavelength Nanostructures

Cited by 379 publications

References 26 publications

Design of Ultracompact Graphene-Based Superscatterers

Design of Ultracompact Graphene-Based Superscatterers

Nanoscale Photovoltaics

Symmetry‐Broken Metamaterial Absorbers as Reflectionless Directional Couplers for Surface Plasmon Polaritons in the Visible Range

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