Valley Kink States and Topological Channel Intersections in Substrate‐Integrated Photonic Circuitry

Zhang, Li; Yang, Yihao; He, Mengjia; Wang, Hai-Xiao; Yang, Zhаoju; Li, Er‐Ping; Gao, Fei; Zhang, Baile; Singh, Ranjan; Jiang, Jianhua; Chen, Hongsheng

doi:10.1002/lpor.201900159

Cited by 81 publications

(51 citation statements)

References 38 publications

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“…The robustness of individual effects against lattice and structure disorders has been analyzed in Refs. [21,34,35], which implies similar behavior of our proposed structure.…”

Section: Excitation Of the Pseudopin-and Valley-hall-like Edge Statessupporting

confidence: 65%

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Coexistence of pseudospin- and valley-Hall-like edge states in a photonic crystal with C3v symmetry

Chen

Jiang

Lan

et al. 2020

Phys. Rev. Research

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We demonstrate the coexistence of pseudospin-and valley-Hall-like edge states in a photonic crystal with C 3v symmetry, which is composed of three interlacing triangular sublattices with the same lattice constants. By tuning the geometry of the sublattices, three complete photonic band gaps with nontrivial topology can be created, one of which is due to the band inversion associated with the pseudospin degree of freedom at the point and the other two due to the gapping out of Dirac cones associated with the valley degree of freedom at the K, K points. The system can support triband pseudospin-and valley-momentum locking edge states at properly designed domain-wall interfaces. Furthermore, to demonstrate the novel interplay of the two kinds of edge states in a single configuration, we design a four-channel system, where the unidirectional routing of electromagnetic waves against sharp bends between two routes can be selectively controlled by the pseudospin and valley degrees of freedom. Our work combines the pseudospin and valley degrees of freedom in a single configuration and may provide more flexibility in manipulating electromagnetic waves with promising potential for multiband and multifunctional applications.

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“…The robustness of individual effects against lattice and structure disorders has been analyzed in Refs. [21,34,35], which implies similar behavior of our proposed structure.…”

Section: Excitation Of the Pseudopin-and Valley-hall-like Edge Statessupporting

confidence: 65%

“…In addition to the capability of maintaining unidirectional propagation against sharp bends, the pseudospin-and valley-Hall like edge states are also robust against moderate disorders. The robustness of individual effects against lattice and structure disorders has been analyzed in [21,34,35], which implies similar behavior of our proposed structure.…”

supporting

confidence: 61%

Coexistence of pseudospin- and valley-Hall-like edge states in a photonic crystal with C3v symmetry

Chen

Jiang

Lan

et al. 2020

Phys. Rev. Research

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“…Photonic topological insulators (PTIs) host unprecedented edge states such as chiral or helical edge states in 2D PTIs and Dirac‐fermion‐like surface states in 3D PTIs . The topologically protected edge states can lead to important applications such as high‐transmittance waveguides, robust photonic delay lines, topological wave partition, robust photonic transport on nonplanar surfaces, topological lasers, and topological quantum interfaces …”

mentioning

confidence: 99%

Higher‐Order Topological States in Surface‐Wave Photonic Crystals

et al. 2020

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Photonic topological states have revolutionized the understanding of the propagation and scattering of light. The recent discovery of higher‐order photonic topological insulators opens an emergent horizon for 0D topological corner states. However, the previous realizations of higher‐order topological insulators in electromagnetic‐wave systems suffer from either a limited operational frequency range due to the lumped components involved or a bulky structure with a large footprint, which are unfavorable for achieving compact photonic devices. To overcome these limitations, a planar surface‐wave photonic crystal realization of 2D higher‐order topological insulators is hereby demonstrated experimentally. The surface‐wave photonic crystals exhibit a very large bulk bandgap (a bandwidth of 28%) due to multiple Bragg scatterings and host 1D gapped edge states described by massive Dirac equations. The topology of those higher‐dimensional photonic bands leads to the emergence of in‐gap 0D corner states, which provide a route toward robust cavity modes for scalable compact photonic devices.

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“…At microwave frequencies, a substrate‐integrated VPC was proposed and experimentally realized. [ 103 ] Triangular scatterers are placed between two metallic plates, and there is a tiny gap between the scatterers and the top plates. The structure can be manufactured by the standard printed circuit board (PCB) technique and has the advantages of ultrathin thicknesses, excellent self‐consistent electrical shielding, and compatibility with the conventional microwave substrate‐integrated circuits.…”

Section: Vpcs On Different Platformsmentioning

confidence: 99%

Topological Valley Photonics: Physics and Device Applications

Xue

Yang

Baile

2021

Advanced Photonics Research

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Topological photonics has emerged as a promising field in photonics that is able to shape the science and technology of light. As a significant degree of freedom, valley is introduced to design and construct photonic topological phases, with encouraging recent progress in applications ranging from on‐chip communications to terahertz lasers. Herein, the development of topological valley photonics is reviewed, from both perspectives of fundamental physics and practical applications. The unique valley‐contrasting physics determines that the bulk topology and the bulk‐boundary correspondence in valley photonic topological phases exhibit different properties from other photonic topological phases. Valley conservation allows not only robust propagation of light through sharp corners, but also 100% out‐coupling of topological states to the surrounding environment. Finally, robust valley transport requires no magnetic materials or the complex construction of photonic pseudospin and, thus, can be integrated on compact photonic platforms for future technologies.

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Valley Kink States and Topological Channel Intersections in Substrate‐Integrated Photonic Circuitry

Cited by 81 publications

References 38 publications

Coexistence of pseudospin- and valley-Hall-like edge states in a photonic crystal with C3v symmetry

Coexistence of pseudospin- and valley-Hall-like edge states in a photonic crystal with C3v symmetry

Higher‐Order Topological States in Surface‐Wave Photonic Crystals

Topological Valley Photonics: Physics and Device Applications

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