Topological rainbow based on graded topological photonic crystals

Zhang, Hongyu; Qian, Long; Wang, Chenyang; Ji, Chang‐Yin; Liu, Yaotian; Chen, Jiali; Lu, Cuicui

doi:10.1364/ol.419271

Cited by 45 publications

(10 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It should be emphasized that the similar topological rainbow phenomena have been studied in previous studies (Chen et al, 2019b;Zhang et al, 2021), but our ideas and studies are completely different from them. On the one hand, in ref.…”

Section: Discussionmentioning

confidence: 42%

“…On the other hand, in ref. Zhang et al (2021), the authors realized a rainbow based on graded dielectric photonic crystals, which are constructed by changing the degree of lattice contraction and expansion, so its physical mechanism of rainbow is completely distinguished from our study. Besides, this rainbow waveguide is composed of a dielectric material; thus, once its structure is fabricated, its properties cannot be adjusted, which greatly limits the application of rainbow waveguides.…”

Section: Discussionmentioning

confidence: 87%

See 1 more Smart Citation

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

et al. 2021

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionmentioning

confidence: 42%

Section: Discussionmentioning

confidence: 87%

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

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The appearance of rainbow trapping offers a novel technique for frequency routing of slow light [1]. After the formation of the first theoretical work, many successive methods were presented to realize rainbow trapping, such as metamaterials [1,2], metasurfaces [3], plasmonic structures [4][5][6], phononic crystals in one-dimensional (1D) [7] and two-dimensional (2D) [8], and photonic crystals (PCs), in 1D [9], 2D [10,11] and three-dimensional (3D) [12]. Most of the mentioned methods depend on either metallic or dielectric materials.…”

Section: Introductionmentioning

confidence: 99%

Bidirectional Rainbow Trapping in 1-D Chirped Topological Photonic Crystal

Elshahat

2022

Front. Phys.

Self Cite

View full text Add to dashboard Cite

The rainbow trapping effect has attracted gathering attention due to its potential application in data processing, energy storage, and light-matter interaction enhancement. The interest has increased recently with the advent of topological photonic crystals (PCs), as the topological PC affords a robust platform for nanophotonic devices. We proposed a chirped one-dimensional (1D) PC as a sandwiched trapped between two1D topological PCs to realize two topological edge states (TESs) for topological protection and trap the formed rainbow. Through graded the thickness of dielectric layers of the chirped 1D PC, light of different wavelengths components localizes and stores at different spatial positions leading to rainbow trapping formation. Unidirectional rainbow trapping can be observed by progressively increasing the thicknesses of the chirped PC. Nonetheless, changing increasingly one of its thicknesses and solidifying the other leads to bidirectional rainbow trapping. Achieving bidirectional rainbow trapping will reduce the footprint of nanophotonic devices in the future. This work brings inspiration to the realization of the rainbow trapping effect and provides a way to design topological nanophotonic devices.

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

Topological rainbow based on graded topological photonic crystals

Cited by 45 publications

References 24 publications

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

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

Bidirectional Rainbow Trapping in 1-D Chirped Topological Photonic Crystal

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

Contact Info

Product

Resources

About