Toroidal Localized Spoof Plasmons on Compact Metadisks

Qin, Pengfei; Yang, Yihao; Musa, Muhyiddeen Yahya; Zheng, Bin; Wang, Zuojia; Hao, Ran; Wang, Yin; Chen, Hongsheng; Li, Er‐Ping

doi:10.1002/advs.201700487

Cited by 28 publications

(12 citation statements)

References 50 publications

(69 reference statements)

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“…Toroidal dipole moments excited in LSSPs was detected in a compact planar metadisk based on SRRs (see Figure 3C,D). 155 On the one hand, the near‐field distributions of the toroidal LSSPs' resonance mode were successfully observed both in simulated and experimental results. On the other hand, the miniaturized device volume of the structure could make a vast difference to the integrated photonic circuits.…”

Section: Toroidal Excitations In Plasmonic Metamaterialsmentioning

confidence: 79%

Subwavelength optical localization with toroidal excitations in plasmonic and Mie metamaterials

Yang

Shen

et al. 2021

InfoMat

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Since the performance of electronic circuits is becoming rather limited in face of intensively increasing of amount of information and related operations, all‐optical processing offers a promising strategy for future information system. It would benefit a great deal if the all‐optical processing could be implemented within the developed electronic chips of nanoscale structures. In that it is highly desirable to break the diffraction limit of light for achieving effective light manipulations with deep subwavelength structures compatible with the state‐of‐the‐art nanofabrication processes. It is of fundamental importance to get subwavelength optical localization, that is, squeeze light wave into subwavelength space for achieving freely manipulating of light fields. This review summarizes the development in realizing subwavelength optical localization by exciting toroidal mode in photonic metamaterials. The toroidal excitations in plasmonic metamaterials and Mie resonant metamaterials, in 3D structures and planar metamaterials, with single or few layers in spectral regime from microwave to optical frequencies are surveyed. Based on the discussion on the configurations of toroidal excitations, the recent development on toroidal‐related optical scattering control actively manipulates the toroidal excitations, and promising applications are further investigated and highlighted.

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Section: Toroidal Excitations In Plasmonic Metamaterialsmentioning

confidence: 79%

Subwavelength optical localization with toroidal excitations in plasmonic and Mie metamaterials

Yang

Shen

et al. 2021

InfoMat

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“…[ 3–5 ] Recently, 3D metamaterials were exploited to enhance the toroidal moment by suppressing the electric and magnetic moments in the microwave range. [ 6–12 ] However, toroidal 3D metamaterials involve complex fabrication steps as the wavelength of operation shrinks from millimeter size at microwave frequencies to micrometer scale at terahertz (THz) frequencies. More recently, planar THz toroidal‐resonant metadevices have been widely studied due to easier fabrication by using conventional photolithography fabrication techniques.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Microfluidic Sensing with Dual‐Torus Toroidal Metasurfaces

Liao

Gupta

et al. 2021

Advanced Optical Materials

107

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Toroidal excitation manifests as currents flowing on the surface of a torus along its meridians that are known as poloidal currents. Several intriguing phenomena such as nonradiating anapole excitation, dynamic Aharonov–Bohm effect, and vector potential in the absence of electromagnetic fields occur in the presence of toroidal excitations. Toroidal resonances in metamaterials also offer a platform to probe strong light–matter interactions in its proximity due to the nonradiating confinement of photons. Here, a dual‐torus toroidal flexible metasurface containing an array of overlapped split ring resonators is experimentally demonstrated, which results in strong field confinement for enhanced sensing of polar liquid analytes. Microfluidic integrated dual‐torus toroidal resonance experimentally shows significantly higher sensitivity of 124.3 GHz per refractive index unit compared to a single torus toroidal resonance. Flexible metasurfaces supporting dual torus toroidal resonance can find a wide range of applications in the development of ultrasensitive terahertz molecular sensors for probing real time monitoring of chemicals and biomolecules.

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“…However, this has successfully been addressed by structuring artificial molecules with toroidal symmetry, [88,89] or large 3D metamolecules. [31,32,[90][91][92][93][94] Next, since the theoretical aspects of the toroidal multipole excitations are described comprehensively in previous review and research articles, [31,54] we majorly concentrate on the excitation mechanisms of toroidal moments in 3D and planar metastructures.…”

Section: Key Principles Of Toroidal Meta-atomsmentioning

confidence: 99%

Section: Planar Metastructures For Toroidal Mode Excitationmentioning

confidence: 99%

Toroidal Metaphotonics and Metadevices

Ahmadivand

Gerislioglu

Ahuja

et al. 2020

Laser & Photonics Reviews

107

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Toroidal moments in artificial media have received growing attention and considered as a promising framework for initiating novel approaches to manage intrinsic radiative losses in nanophotonic and plasmonic systems. In the past decade, there has been substantial attention on the characteristics and excitation methods of toroidal multipoles-in particular, toroidal dipole-in 3D bulk and planar metaplatforms. The remarkable advantages of toroidal resonances have thrust the toroidal metasurface technology from relative anonymity into the limelight, in which researchers have recently centered on developing applied optical and optoelectronic subwavelength devices based on toroidal metaphotonics and metaplasmonics. In this focused contribution, the key principles of 3D and flatland toroidal metastructures are described, and the revolutionary tools that have been implemented based on this topology are briefly highlighted. Infrared photodetectors, immunobiosensors, ultraviolet beam sources, waveguides, and functional modulators are some of the fundamental and latest examples of toroidal metadevices that have been introduced and studied experimentally so far. The possibility of the realization of strong plexciton dynamics and pronounced vacuum Rabi oscillations in toroidal plasmonic metasurfaces are also presented in this review. Ultimate efficient extreme-subwavelength scale devices, such as low-threshold lasers and ultrafast switches, are thus in prospect.

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Toroidal Localized Spoof Plasmons on Compact Metadisks

Cited by 28 publications

References 50 publications

Subwavelength optical localization with toroidal excitations in plasmonic and Mie metamaterials

Subwavelength optical localization with toroidal excitations in plasmonic and Mie metamaterials

Terahertz Microfluidic Sensing with Dual‐Torus Toroidal Metasurfaces

Toroidal Metaphotonics and Metadevices

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