Anapole States and Toroidal Resonances Realized in Simple Gold Nanoplate‐on‐Mirror Structures

Cui, Ximin; Lai, Yunhe; Ai, Ruoqi; Wang, Hao; Shao, Lei; Chen, Huanjun; Zhang, Wei; Wang, Jianfang

doi:10.1002/adom.202001173

Cited by 31 publications

(24 citation statements)

References 50 publications

(69 reference statements)

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“…[387,388] Figure 13 shows drawings of various forms of toroidal-resonant metastructures that have been engineered for next-generation nanophotonic and plasmonic applications. [389][390][391][392][393][394][395][396][397][398][399] Squeezing electromagnetic fields within an extremely small spot and possessing exquisite sensitivity to the environmental perturbations, toroidal scatterers allow for the creation of high-precision biochemical sensors and immunobiosensing instruments. [24] In the following, we consider recently conducted studies for devising toroidal biochemical and thermal sensors.…”

Section: Toroidal Metasensorsmentioning

confidence: 99%

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Photonic and Plasmonic Metasensors

Ahmadivand

Gerislioglu

2021

Laser & Photonics Reviews

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Biosensors have been designed and developed for detecting biomarkers, biomolecules, proteins, enzymes, organisms, and various types of bacterial and viral diseases since the turn of the century. Initially marred by poor sensitivity, specificity, and selectivity, the advent of the notion of photonic biosensors has successfully addressed such drawbacks. One of the hallmarks of modern pharmaceutical industries is the miniaturization of photonic platforms via continuous scaling down of their sizes, which was accomplished by leveraging the concept of artificial media. Numerous forms of photonic and plasmonic devices have been configured for next-generation technologies since the emergence of metamaterials. Among diverse applications, the development of cost-effective, label-free, selective, precise, and on-chip immunobiosensors with rapid sample-to-result feature has received copious interest, recently. This focused Review brings clarity to the rapidly growing body of available and in-development metamaterials-enabled diagnostic instruments based on inventive and promising approaches. Through centering on the operating principles of plasmonic, photonic, and hybrid metasensors, we mechanistically characterize and describe the properties of such tools and summarize the most recent achievements in devising metasensors and bioimaging tools with high precision. This insightful understanding serves as a comprehensive source for scientists, physicians, and students to construct ultradense and high-throughput clinical screening metadevices.

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Section: Toroidal Metasensorsmentioning

confidence: 99%

Section: Toroidal Metasensorsmentioning

confidence: 99%

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Photonic and Plasmonic Metasensors

Ahmadivand

Gerislioglu

2021

Laser & Photonics Reviews

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“…To obtain the maximum electromagnetic field enhancement factor, various approaches have been proposed, for instance, designing an ion-metal dimer structure with a Nanomaterials 2021, 11, 1490 2 of 10 small distance between two plasma-metal nanostructures for maximum amplification [18] and adding a glass substrate under the disk [19]. Optical anapoles are often realized with metallic materials with complex geometries [20][21][22]. However, high intrinsic absorption losses and associated local heating of the plasmonic nanostructures severely limit their practical use in many scenarios.…”

Section: Introductionmentioning

confidence: 99%

Optical Anapole Modes in Gallium Phosphide Nanodisk with Forked Slits for Electric Field Enhancement

Liu

et al. 2021

Nanomaterials

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High refractive index dielectric nanostructures represent a new frontier in nanophotonics, and the unique semiconductor characteristics of dielectric systems make it possible to enhance electric fields by exploiting this fundamental physical phenomenon. In this work, the scattered radiation spectral features and field-enhanced interactions of gallium phosphide disks with forked slits at anapole modes are investigated systematically by numerical and multipole decomposition analyses. Additional enhancement of the electric field is achieved by opening the forked slits to create high-intensity hot spots inside the disk, and nearby molecules can access these hot spots directly. The results reveal a novel approach for near-field engineering such as electric field localization, nonlinear optics, and optical detection.

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“…Thereafter, the fundamental toroidal multipoles, i.e. toroidal dipole resonances, have been achieved in both 2D and 3D architectures from visible to terahertz regions [20][21][22][23][24][25][26][27]. In addition, toroidal dipole resonance based metamaterials opened a new route to many exciting applications, such as optical force enhancement [28], sensing [29], light absorption [30], transparency [31], unidirectional scattering [32], and even enhanced nonlinear emissions [33].…”

Section: Introductionmentioning

confidence: 99%

Second Harmonic Generation Enhancement From Plasmonic Toroidal Resonance in Core-Shell Nanodisk

et al. 2021

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Toroidal multipoles, together with electric and magnetic multipoles, provide a complete description of electromagnetic responses of matter. The fundamental toroidal resonance has been extensively achieved and investigated in nanooptics, showing great ability to increase light absorption and light force. In this paper, we obtained plasmonic toroidal dipole resonance in core-shell (dielectric-core/gold-shell) nanodisk and demonstrated an enhanced second harmonic generation (SHG) from this resonance. It was shown that the toroidal dipole resonance based SHG depends on the refractive index of dielectric-core. For large refractive index cases, head-to-tail magnetic dipole pairs form a close loop, which is a signature of toroidal dipole and results in the enhancement of SHG. In addition, the frequency of this SHG red shifts as the refractive index of dielectric-core increases. We also investigated the cases in which the dielectric-core is filled with several common materials. Moreover, the toroidal resonance based SHG depends on both inner and outer radius of the core-shell nanodisk. Such results may serve for the developments of nonlinear nanooptics and their applications.

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Anapole States and Toroidal Resonances Realized in Simple Gold Nanoplate‐on‐Mirror Structures

Cited by 31 publications

References 50 publications

Photonic and Plasmonic Metasensors

Photonic and Plasmonic Metasensors

Optical Anapole Modes in Gallium Phosphide Nanodisk with Forked Slits for Electric Field Enhancement

Second Harmonic Generation Enhancement From Plasmonic Toroidal Resonance in Core-Shell Nanodisk

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