Valley topological line-defects for Terahertz waveguides and power divider

Li, BoLin; Shi, Hongyu; Sha, Wei E. I.; Yi, Jianjia; Li, Guoqiang; Zhang, Anxue; Xu, Zhuo

doi:10.1016/j.optmat.2022.112152

Cited by 11 publications

(3 citation statements)

References 33 publications

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“…5) Topological photonics utilizes the geometric properties of materials to control light. 6) Extensive studies on the utilization of topological properties have been conducted, such as wavenumber space propagation control [7][8][9][10][11][12][13] and topological beams in real space. 14,15) Topology characterizes the property of having the same characteristics, although the shapes differ.…”

Section: Introductionmentioning

confidence: 99%

“…By providing a special band structure inside the material, light of a specific wavelength can be directed in any direction. 7,[9][10][11][12][13] Because of these properties, this material is expected to be applied in fields, such as high-speed communication and optoelectronics. 6,8) A topological insulator is a material in which electrons cannot conduct inside the substrate but can conduct at the surface because it exhibits a unique electronic state.…”

Section: Introductionmentioning

confidence: 99%

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THz wave Mux/DeMux operation using bearded-type topological photonic crystal waveguide structure

Hata,

Fujikata

2024

Jpn. J. Appl. Phys.

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Terahertz (THz)wave wireless communication technologies have been developed to increase transmission capacity in 6G communications. Although the realization of integrated waveguides in THz wave transmitters and receivers is essential, bending loss in THz waveguides is important as well. This study investigated a THz waveguide based on a valley photonic crystal (VPC) structure. We numerically investigated a THz waveguide with sharp bending and Mux/DeMux filters based on the oblique rectangular resonator of a bearded-type VPC waveguide.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

THz wave Mux/DeMux operation using bearded-type topological photonic crystal waveguide structure

Hata,

Fujikata

2024

Jpn. J. Appl. Phys.

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“…However, the propagations of these SSPP waves and line waves are not topologically protected (i.e., defects along the waveguide can lead to reflection and transmission loss). Recently, coupling from the classical transmission line modes to the topological modes based on the quantum spin Hall system [30] , and coupling from the conventional waveguide modes to the topological modes based on the quantum valley Hall system [31] have been reported. Compared with quantum spin and quantum valley Hall systems, the topological modes based on the quantum Hall system have the strongest robustness against defects, which provides a powerful platform for the discovery and application of novel topological phenomena.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient conversion from classical guided waves to topological chiral edge states

Han,

Liang,

Zhao

et al. 2024

Chin. Opt. Lett.

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Electromagnetic topological chiral edge states mimicking the quantum Hall effect have attracted a great deal of attention due to their unique features of free backscattering and immunity against sharp bends and defects. However, the matching techniques between classical waveguides and the topological one-way waveguide deserve more attention for real-world applications. In this paper, a highly efficient conversion structure between a classical rectangular waveguide and a topological one-way waveguide is proposed and demonstrated at the microwave frequency, which efficiently converts classical guided waves to topological one-way edge states. A tapered transition is designed to match both the momentum and impedance of the classical guided waves and the topological one-way edge states. With the conversion structure, the waves generated by a point excitation source can be coupled to the topological one-way waveguide with very high coupling efficiency, which can ensure high transmission of the whole system (i.e., from the source and the receiver). Simulation and measurement results demonstrate the proposed method. This investigation is beneficial to the applications of topological one-way waveguides and opens up a new avenue for advanced topological and classical integrated functional devices and systems.

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Effects of structure parameters on kink states of two-dimensional valley photonic crystals

Zhang,

Sui,

Zhang

et al. 2023

Computational Materials Science

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Valley topological line-defects for Terahertz waveguides and power divider

Cited by 11 publications

References 33 publications

THz wave Mux/DeMux operation using bearded-type topological photonic crystal waveguide structure

THz wave Mux/DeMux operation using bearded-type topological photonic crystal waveguide structure

Highly efficient conversion from classical guided waves to topological chiral edge states

Effects of structure parameters on kink states of two-dimensional valley photonic crystals

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