A unidirectional air waveguide basing on coupling of two self-guiding edge modes

He, Liu; Gao, Yongfeng; Jiang, Zhen; Wang, Lisong; Zhou, Jun; Xu, Xiaojing

doi:10.1016/j.optlastec.2018.06.044

Cited by 17 publications

(4 citation statements)

References 15 publications

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“…[9,10] Subsequently, some researchers used this method to design a mass of PC unidirectional waveguides and related devices. [11][12][13][14][15][16][17][18][19][20][21][22][23] However, the magnetic materials in the magneto-optical PC have large volume with the considerable absorption loss, which are mainly applied to the microwave frequency band; thus, researchers put their eyes on the dielectric materials. In 2015, Wu and Hu [24] realized the photonic quantum spin Hall effect (PQSHE) attributed to spin-orbit coupling protection that preserved TR symmetry using a 2D honeycomb lattice dielectric PC composed of a C 6v symmetric honeycomb unit cell.…”

mentioning

confidence: 99%

Variation of Topological Edge States of 2D Honeycomb Lattice Photonic Crystals

Peng

Yan

Xie

et al. 2020

Physica Rapid Research Ltrs

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Herein, the photonic quantum spin Hall effect is realized in a dielectric 2D honeycomb lattice photonic crystal (PC) with scatterers having various shapes, by stretching and shrinking the honeycomb unit cell. The topological edge states and their unidirectional transmission as scatterers with triangular, pentagonal, and heptagonal shapes are studied. The unidirectional transmission in an inverted Ω‐shaped waveguide, when different types of defects are incorporated, is realized to verify the characteristics of the topological protection. Moreover, flat band can be realized by varying the shape of several scatterers near the combined junction of PCs with different topological states, and the variation trend of flat band is evaluated with the increase in the edge number of varied scatterers from four to seven at different times. Moreover, a slow‐light waveguide is designed to further demonstrate the influence of the shape of scatterers on topological edge states for light transmission. Furthermore, the novel optical phenomenon of static state is realized; that is, light is not able to transmit but is trapped at the original position. This can increase the adjustability of the topological edge states and provide more potential applications for integrated photonic devices.

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mentioning

confidence: 99%

Variation of Topological Edge States of 2D Honeycomb Lattice Photonic Crystals

Peng

Yan

Xie

et al. 2020

Physica Rapid Research Ltrs

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“…For simplicity, based on the Maxwell equations [25], we calculate the configuration bands and eigenvalue frequencies, and numerically simulate dispersion relations of eigenmodes with the finite element method (FEM) using COMSOL Multiphysics. The projected band dispersion curves of the line defect waveguide and the dispersion curves of waveguide-cavity interaction are obtained through calculating the supercell 1 and supercell 2 [26][27][28][29][30], respectively.…”

Section: Model and Methodsmentioning

confidence: 99%

Investigation of coupling effect between a unidirectional air waveguide and two cavities with one-way rotating state

Gao¹,

He²,

Jiang³

et al. 2020

Optica Applicata

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In the paper we present an implementation of resonance coupling between a unidirectional air waveguide and two cavities with one-way rotating state in a two-dimensional dielectric photonic crystal and a magneto-optical photonic crystal. We theoretically calculate the dispersion curves of the line defect waveguide and the dispersion curves of waveguide-cavity interaction, respectively. Numerical simulations show that, via waveguide-cavity coupling, a series of interesting resonance phenomena can be generated in the system. By modifying direction of the applied external magnetic field, storing and discharging of photonic energy can be realized. Our work may provide a practical and useful guidance for optical communications.

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“…Researchers have found that one-way edge modes can appear in valley PCs and magneto-optical photonic crystals (MOPCs) [ 2 , 3 , 4 ]. Among them, MOPCs provide an important platform for studying the generation and transport properties of topological photonic states (TPSs) by breaking time-reversal symmetry via a dc external magnetic field (EMF), which can be seen as a one-way mode [ 6 , 7 , 8 ]. In 2008, Raghu and Haldane first predicted the existence of electromagnetic one-way edge states as analogs of the quantum Hall effect in two-dimensional (2D) PCs possessing Dirac point-derived bandgaps [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Reversible Conversion of Odd/Even One-Way Modes in Magneto-Optical Photonic Crystal Double-Channel Waveguides

Zhuang

Chen

et al. 2022

Nanomaterials

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We have studied the transmission properties of odd/even one-way modes and their reversible conversion in a double-channel waveguide consisting of two magneto-optical photonic crystals (MOPCs) sandwiched with Al2O3 PC. There exist two pairs of even and odd modes, i.e., M1(even)/M2(odd) or M3(odd)/M4(even) modes, for the double-channel waveguides with one- or two-stranded coupling layer of Al2O3 rods, respectively. Among them, the M1, M2, and M3 modes are caused by the weak coupling strength of two sub-waveguides, while the M4 mode results from the strong coupling effect and supports dispersionless slow-light propagation. Furthermore, we realize the reversible conversion between odd and even modes (i.e., between M1 and M2 modes, or M3 and M4 modes) in the one- or two-stranded structure, respectively, by adjusting the length and position of the perfect electric conductor (PEC) defect properly to cause the desired significant phase delay along the upper and lower equivalent transmission paths. Additionally, we find that the robustness of the M1 even mode is poor because of extra excitations of counter-propagation modes near the right Brillouin boundary, while the other three modes have extremely strong robustness against PEC defects and their one-way transmittances are nearly 100%. These results hold promise for many fields, such as slow-light modulation and the design of topological devices.

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A unidirectional air waveguide basing on coupling of two self-guiding edge modes

Cited by 17 publications

References 15 publications

Variation of Topological Edge States of 2D Honeycomb Lattice Photonic Crystals

Variation of Topological Edge States of 2D Honeycomb Lattice Photonic Crystals

Investigation of coupling effect between a unidirectional air waveguide and two cavities with one-way rotating state

Reversible Conversion of Odd/Even One-Way Modes in Magneto-Optical Photonic Crystal Double-Channel Waveguides

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