Optical Anapole Metamaterial

Wu, Pin Chieh; Liao, Chun Yen; Savinov, Vassili; Chung, Tsung Lin; Chen, Wei Ting; Huang, Yao-Wei; Wu, Pei; Chen, Yi Hao; Liu, Ai Qun; Zheludev, Nikolay I.; Tsai, Din Ping

doi:10.1021/acsnano.7b08828

Cited by 258 publications

(163 citation statements)

References 39 publications

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“…The pioneer work was done for artificial toroidal metamolecules in Zheludev's group for microwave frequency range . Later on, a toroidal electric dipole (TED) response was also demonstrated in the terahertz frequency range and for the optical frequencies …”

Section: Introductionmentioning

confidence: 99%

The High‐Order Toroidal Moments and Anapole States in All‐Dielectric Photonics

Gurvitz

Ladutenko

Dergachev

et al. 2019

Laser & Photonics Reviews

188

165

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All‐dielectric nanophotonics attracts ever increasing attention nowadays due to the possibility of controlling and configuring light scattering on high‐index semiconductor nanoparticles. It opens a room of opportunities for designing novel types of nanoscale elements and devices, and paves the way for advanced technologies of light energy manipulation. One of the exciting and promising prospects is associated with utilizing the so‐called toroidal moment, being the result of poloidal currents excitation, and anapole states, corresponding to the interference of dipole and toroidal electric moments. Here, higher‐order toroidal moments of both types (up to the electric octupole toroidal moment) are presented and investigated in detail via the direct Cartesian multipole decomposition allowing new near‐ and far‐field configurations to be obtained. Poloidal currents can be associated with vortex‐like distributions of the displacement currents inside nanoparticles, revealing the physical meaning of the high‐order toroidal moments and the convenience of the Cartesian multipoles as an auxiliary tool for analysis. High‐order nonradiating anapole states accompanied by the excitation of intense near‐fields are demonstrated. It is believed that the results are of high importance for both the fundamental understanding of light scattering by high‐index particles and a variety of nanophotonics applications and light governing on nanoscale.

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Section: Introductionmentioning

confidence: 99%

The High‐Order Toroidal Moments and Anapole States in All‐Dielectric Photonics

Gurvitz

Ladutenko

Dergachev

et al. 2019

Laser & Photonics Reviews

188

165

View full text Add to dashboard Cite

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“…Nevertheless, we should mention the ref. [], in which the possibility of an anapole excitation in 3D plasmonic toroidal metamaterials of the optical range has been shown. Commonly exploited technique is electron‐beam lithography with subsequent reactive ion etching (RIE), carving procedure or femtosecond lasers .…”

Section: Introductionmentioning

confidence: 99%

Anapole Mode Sustaining Silicon Metamaterials in Visible Spectral Range

Ospanova

Stenishchev

Basharin

2018

Laser & Photonics Reviews

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This paper is dedicated to a type of perforated silicon metamaterials, possessing anapole mode in visible spectral range due to destructive interference between electric and toroidal dipole moments. The proposed structure gains both in attainable material and simplified fabrication. Such a material exhibits a desirable physical effect and has obvious practical application: it supports the anapole mode without complicated 3D toroidal geometry and can be processed in one step by nanofabrication methods. The metamaterial paves the way for advanced optical devices on the base of all‐dielectric metamaterials. Besides inherently low dissipative losses and strong anapole response, such an optical metamaterial can demonstrate subtle sensing, nonradiative data transfer, Aharonov‐Bohm effect and other tempting applications in nanophotonics.

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“…Recently, the phenomenon of SHG has been widely studied in various metallic nanostructures, such as nanorods, nanoparticles, multiresonant, nanoantennas, etc. [29][30][31] This is an undesirable scenario for the SHG process whose conversion efficiency strongly depends on the square of the strength of involved electromagnetic fields. [29][30][31] This is an undesirable scenario for the SHG process whose conversion efficiency strongly depends on the square of the strength of involved electromagnetic fields.…”

Section: Stereometamaterialsmentioning

confidence: 99%

“…This type of 3D structure as stereometamaterials has recently attracted a lot of attention since their optical properties are more adjustable and flexible than conventional 2D ones. [29] We have subsequently explored feasible applications based on VSRRs, such as optical anapole excitation, [30] plasmonic sensing, [31] and anomalous beam steering. As a result, it generates stronger localized fields within the opening gaps.…”

Section: Stereometamaterialsmentioning

confidence: 99%

Second Harmonic Light Manipulation with Vertical Split Ring Resonators

et al. 2018

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inducing electromagnetic fields. [9,10] In general, SHG conversion efficiency relies on several factors: inversion asymmetry of the hosting media, spatial overlap of the fundamental and second-harmonic (SH) modes, quality factor (Q-factor) of the involved modes, and the field intensity of the fundamental resonant mode. [11][12][13][14][15][16] Among these factors, plasmonic nanostructures [17][18][19][20][21][22][23] have a clear advantage of being particularly effective in inducing strong electromagnetic field that can increase the SHG conversion efficiency. For instance, the large field confinement associated with the magnetic resonances of split-ring resonators (SRRs) has led to a significant SHG enhancement. [23][24][25][26][27][28] While these prior results have been a major step forward in demonstrating SHG in plasmonic structures, further improvement is needed if they were to become a competitive alternative. Take SRR metasurface as an example, most of fabricated SRRs are of planar subwavelength structures, in which they lay flat on a high index dielectric substrate as illustrated in the inset of Figure 1a. While such planar SRRs (PSRRs) are relatively easy to fabricate, the strong fields present in PSRR gaps are inevitably exposed to the underlying substrate, resulting in leakage of the electromagnetic energy into the substrate, reducing the exposure of enhancedThe second harmonic generation (SHG) of vertical and planar split-ring resonators (SRRs) that are broken centro-symmetry configurations at the interface of metal surface and air is investigated. Strong interactions, better electromagnetic field confinements, and less leakage into the substrate for vertical SRRs are found. Experimental results show a 2.6-fold enhancement of SHG nonlinearity, which is in good agreement with simulations and calculations. Demonstrations of 3D metastructures and vertical SRRs with strong SHG nonlinearity majorly result from magnetic dipole and electric quadrupole clearly provides potential applications for photonics and sensing. StereometamaterialsSince its discovery soon after the invention of the laser, the second harmonic generation (SHG) as a prominent nonlinear optical effect has played an important role in various photonic applications ranging from light source, [1] high-resolution imaging, to spectroscopy. [2][3][4] Fundamentally, SHG is prohibited in bulk noble metals such as gold and silver occasionally used in metamaterials because of their centrosymmetric crystal lattices. Recently, the phenomenon of SHG has been widely studied in various metallic nanostructures, such as nanorods, nanoparticles, multiresonant, nanoantennas, etc. [5][6][7][8] In plasmonic systems, nonlinearity was mainly attributed to either the broken centro-symmetry at the metal surface or to the high degree of the asymmetric spatial variation of the

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Optical Anapole Metamaterial

Cited by 258 publications

References 39 publications

The High‐Order Toroidal Moments and Anapole States in All‐Dielectric Photonics

The High‐Order Toroidal Moments and Anapole States in All‐Dielectric Photonics

Anapole Mode Sustaining Silicon Metamaterials in Visible Spectral Range

Second Harmonic Light Manipulation with Vertical Split Ring Resonators

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