Momentum space toroidal moment in a photonic metamaterial

Yang, Biao; Bi, Yu; Zhang, Rui Xing; Zhang, Ruo Yang; You, Oubo; Zhu, Zhihong; Feng, Jing; Sun, Hong–Bo; Chan, C. T.; Liu, Chao Xing; Zhang, Shuang

doi:10.1038/s41467-021-22063-w

Cited by 22 publications

(20 citation statements)

References 57 publications

(36 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%

mentioning

confidence: 99%

Photonic and Plasmonic Metasensors

Ahmadivand

Gerislioglu

2021

Laser & Photonics Reviews

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“…Nodal lines have drawn attention because they can feature two-dimensional surface states bounded by the projected nodal lines, called drumhead surface states [19][20][21], and exhibit non-Abelian band topology [17]. Moreover, as nodal lines have higher dimensions than Dirac/Weyl points, they show various shapes, for instance, a simple nodal line, a nodal ring [22][23][24], nodal knots [25][26][27] for a single nodal line or a Hopf link [18,[27][28][29][30][31], a nodal chain [18,[32][33][34] for multiple nodal lines.…”

Section: Introductionmentioning

confidence: 99%

“…Along with the progress in understanding band topology, recent years saw the rapid development of topological photonics which studies and demonstrates the topological states of photons in metamaterials (including metallic photonic crystals) [22,24,33,[38][39][40][41] and dielectric photonic crystals [7,18,[42][43][44]. In contrast to electronic systems these photonic materials have great advantages because one can design a structure and manipulate the propagation properties of photons with more freedom and in a wide range of frequency spectra.…”

Section: Introductionmentioning

confidence: 99%

Nodal lines in momentum space: topological invariants and recent realizations in photonic and other systems

Park¹,

Gao²,

Zhang³

et al. 2022

Preprint

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Topological insulators constitute one of the most intriguing phenomena in modern condensed matter theory. The unique and exotic properties of topological states of matter allow for unidirectional gapless electron transport and extremely accurate measurements of the Hall conductivity. Recently, new topological effects occurring at Dirac/Weyl points have been better understood and demonstrated using artificial materials such as photonic and phononic crystals, metamaterials and electrical circuits. In comparison, the topological properties of nodal lines, which are one-dimensional degeneracies in momentum space, remain less explored. Here, we explain the theoretical concept of topological nodal lines and review recent and ongoing progress using artificial materials. The review includes recent demonstrations of non-Abelian topological charges of nodal lines in momentum space and examples of nodal lines realized in photonic and other systems. Finally, we will address the challenges involved in both experimental demonstration and theoretical understanding of topological nodal lines.

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“…The EIT-like effect markedly modifies the dispersive of the metamaterials, and can lead to slow-light phenomena. However, most of metamaterials, whose unit cells are generally formed from metal, have the relatively large Ohmic loss 14 , and the sow-light effects can only be tuned passively 15,16 . All-dielectric metamaterials, whose unit cells are made of high-index semiconductor materials, such as silicon (Si), germanium (Ge), offer a potential solution to the issue of metal loss 17,18 .…”

Section: Introductionmentioning

confidence: 99%