Dirac-vortex topological photonic crystal fibre

Lin, Hao; Lü, Ling

doi:10.1038/s41377-020-00432-2

Cited by 45 publications

(23 citation statements)

References 42 publications

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“…Inspired from the discovery of condensed quantum Hall effect, many studies have shown that topological states show essentially single-particle behavior of electrons and one can establish an analogy relationship with photon behaviors called topological photonic state (or topological one-way edge state) [4][5][6][7]. Topological one-way edge state provides a powerful platform for novel photonic devices with nontrivial functionalities and excellent performances, such as one-way waveguide [8][9][10][11][12], topological laser [13][14][15][16][17], rainbow trapping phenomenon [18][19][20][21], dispersionless slow light [22][23][24], topological fibre [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Topological One-Way Edge States in an Air-Hole Honeycomb Gyromagnetic Photonic Crystal

et al. 2022

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Topological one-way edge states have attracted increasing attention because of their intriguing fundamental physics and potential applications, particularly in the realm of photonics. In this paper, we present a theoretical and numerical demonstration of topological one-way edge states in an air-hole honeycomb gyromagnetic photonic crystal biased by an external magnetic field. Localized horizontally to the edge and confined in vertical direction by two parallel metallic plates, these unique states possess robust one-way propagation characteristics. They are strongly robust against various types of defects, imperfections and sharp corners on the path, and even can unidirectionally transport along the irregular edges of arbitrary geometries. We further utilize the one-way property of edge states to overcome entirely the issue of back-reflections and show the design of topological leaky wave antennas. Our results open a new door towards the observation of nontrivial edge states in air-hole topological photonic crystal systems, and offer useful prototype of robust topological photonic devices, such as geometry-independent topological energy flux loops and topological leaky wave antennas.

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Section: Introductionmentioning

confidence: 99%

Topological One-Way Edge States in an Air-Hole Honeycomb Gyromagnetic Photonic Crystal

et al. 2022

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“…n recent years, topological edge states in photonic systems have attracted considerable attention owing to their robustness to scattering and defects as well as reliable edge transmission [1], [2]. They have been widely used in the fields of integrated photonics and fiber optics to improve the beam transmission capacity of photonic crystals [3]- [5] and improve the quality factor of optical microcavities [6], or to achieve realtime detection of biological molecules [7]. Recently, there has been rapid progress in hollow-core photonic bandgap fiber (HC-PBF), which has emerged as an increasingly attractive and credible alternative to all-solid fibers in various applications [8]- [10].…”

Section: Introductionmentioning

confidence: 99%

Accurate Control of Surface Modes in a Hollow-Core Photonic Bandgap Fiber

You¹,

Liu²,

Hao³

et al. 2022

IEEE Photonics J.

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The abrupt termination of periodic structures in hollow-core photonic bandgap fiber (HC-PBF) cladding introduces surface modes (SMs). This results in a high loss and small available bandwidth. This has become an important factor that restricts the development of HC-PBFs. For many years, there has been a lack of clear understanding of SMs. In this study, SMs were considered the main body of research. First, a pure HC-PBF platform was constructed to systematically observe the SMs inside the bandgap. The core wall was used as a control variable to achieve precise control of the SMs. The SMs are divided into two categories: fundamental and high-order SMs. We named the SMs and studied their characteristics, including the mode field shape, coupling bandwidth, and coupling speed. The coupling characteristics of SMs with different core diameters were compared and analyzed. Further, we compared the model with actual fiber to prove the practicality of the theoretical analysis. This study will deepen our understanding of HC-PBF and will have a positive impact on its development.

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“…TPSs have been theoretically proposed and experimentally demonstrated in different photonic systems, such as gyromagnetic photonic crystals (GPCs) (Wang et al, 2008;Wang et al, 2009;Fu et al, 2010;Poo et al, 2011), all dielectric structures (Chen et al, 2017;Dong et al, 2017;Chen et al, 2018;He et al, 2019), non-linear systems (Leykam and Chong, 2016;Kruk et al, 2017;Dobrykh et al, 2018;Kruk et al, 2018;Smirnova et al, 2019;Zangeneh-Nejad and Fleury, 2019;Smirnova et al, 2020), and metamaterials (Gao et al, 2015;Yang et al, 2018;Jia et al, 2019). Various novel physical concepts and applications related to TPSs have also been presented, for example, topological laser (Bahari et al, 2017;Bandres et al, 2018;Harari et al, 2018;Shao et al, 2020;Zeng et al, 2020), topological fiber (Lu et al, 2018;Lin and Lu, 2020), topological delay line (Yang et al, 2013;Chen et al, 2019a;Chen et al, 2019b;Chen et al, 2020;Shi et al, 2021), topological light routing (Chen et al, 2021b), and three-dimensional topological photonic insulator (Yang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Slow Light Rainbow Trapping in a Uniformly Magnetized Gyromagnetic Photonic Crystal Waveguide

et al. 2021

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We present a hybrid gyromagnetic photonic crystal (GPC) waveguide composed of different GPC waveguide segments possessing various cylinder radii and waveguide widths but biased by a uniform external magnetic field. We demonstrate in frequency and time domains that based on the strong coupling of two counter-propagating topologically protected one-way edge states, the intriguing slow light rainbow trapping (SLRT) of electromagnetic (EM) waves can be achieved, that is, EM waves of different frequencies can be slowed down and trapped at different positions without cross talk and overlap. More importantly, due to the existence of one-way edge states, external EM waves can be non-reciprocally coupled to the SLRT waveguide channel, although the incident position of the EM wave is far away from the waveguide channel. Besides, the frequency range of the slow light states can also be easily regulated by tuning the intensity of an external magnetic field, which is very beneficial to solve the contradiction between slow light and broad bandwidth. Our results can be applied to the design of high-performance photonic devices, such as an optical buffer, optical switch, and optical filter.

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Dirac-vortex topological photonic crystal fibre

Cited by 45 publications

References 42 publications

Topological One-Way Edge States in an Air-Hole Honeycomb Gyromagnetic Photonic Crystal

Topological One-Way Edge States in an Air-Hole Honeycomb Gyromagnetic Photonic Crystal

Accurate Control of Surface Modes in a Hollow-Core Photonic Bandgap Fiber

Slow Light Rainbow Trapping in a Uniformly Magnetized Gyromagnetic Photonic Crystal Waveguide

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