Parity-time symmetric photonic topological coupled waveguides

O, Kang-Hyok; Kim, Kwang‐Hyon

doi:10.1016/j.optlastec.2021.107403

Cited by 7 publications

(2 citation statements)

References 39 publications

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“…[22] the dissipationless edge states localized at the PT‐symmetric interface between gain and loss crystals have been investigated within the non‐Hermitian Haldane model. There are only a few reports dealing with practical photonic systems: robust unidirectional propagations in the PT‐symmetric photonic topological coupled waveguides [ 23 ] and topological invariants in the PT‐symmetric photonic pseudospin‐Hall system. [ 24 ]…”

Section: Introductionmentioning

confidence: 99%

Parity‐Time Phase Transition of Topological Corner States in Square Lattice Photonic Crystal Structures

Kim

2022

Advanced Photonics Research

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Marriage of the concepts of parity‐time (PT) symmetry and topology recently gave rise to PT‐symmetric topological photonics, triggering great interest in the community of photonics. This work reveals PT‐symmetric phase transition in second‐order topological photonic systems: the photonic systems consisting of square lattice topological photonic crystals with balanced gain and loss support the corner states, two of which are in thresholdless PT broken phase and the other two exhibit PT phase transition with a threshold determined by the coupling strength between the corner modes. The main advantage of the proposed photonic system is the significantly high gain contrast between the corner states and unnecessary background modes originating from bulk and edge ones, enabling diverse photonic applications such as nanolasing with significantly high power compared with the preceding topological nanolasers made of only gain sublattices. The results presented in this work pave the way toward potential applications such as biological sensing and spectroscopy at the nanoscale.

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Section: Introductionmentioning

confidence: 99%

Parity‐Time Phase Transition of Topological Corner States in Square Lattice Photonic Crystal Structures

Kim

2022

Advanced Photonics Research

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“…Valleys have recently been found as a novel degree of freedom carrying topological information and valley‐Hall photonic crystals have been extensively investigated. [ 1–5 ] Valley contrasting in such photonic crystals results in valley‐protected backscattering suppression, [ 3 ] enabling photonic applications such as topological waveguides, [ 5 ] topological lasing, [ 6,7 ] parity‐time symmetric photonic topological coupled waveguides, [ 8 ] and topological nonlinear photonics. [ 9 ]…”

Section: Introductionmentioning

confidence: 99%

Dual Band Second‐Order Topological Corner States in 2D Valley‐Hall Hexagonal Photonic Crystals

Kim

2021

Physica Status Solidi (b)

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Second‐order topological corner states are of great importance in the field of topological photonics. In particular, for realizing disorder‐immune coherent nanosources based on nonlinear processes one needs multiband topological corner states. This work reports dual band second‐order topological corner states in the structure of valley‐Hall hexagonal photonic crystals. When the ratio between the radii of dielectric cylinders in the unit cells continuously increases, bulk gap opening, appearance of edge states, edge gap opening, and generation of second‐order corner states successively occur in the first and third bandgaps. By changing the structural parameters, the eigenfrequencies of the corner states in both edge gaps can be flexibly adjusted. Compared with square‐lattice valley‐Hall systems, large difference of eigenfrequencies of corner states in dual bandgaps can be obtained with hexagonal photonic crystals, which is the key advantage of the proposed systems for applications in nonlinear coherent generations such as second‐harmonic generation. The numerical results show that the dual band second‐order corner states clearly exhibit robustness against structural defects, significantly distinguished from the defect states. The results presented in this work pave the way toward topologically protected coherent nanosources by nonlinear frequency conversion which are robust against structural disorder or defects.

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Ultrahigh-Q Fano resonance using topological corner modes in second-order pseudospin-Hall photonic systems

Kim

2022

Optics & Laser Technology

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Parity-time symmetric photonic topological coupled waveguides

Cited by 7 publications

References 39 publications

Parity‐Time Phase Transition of Topological Corner States in Square Lattice Photonic Crystal Structures

Parity‐Time Phase Transition of Topological Corner States in Square Lattice Photonic Crystal Structures

Dual Band Second‐Order Topological Corner States in 2D Valley‐Hall Hexagonal Photonic Crystals

Ultrahigh-Q Fano resonance using topological corner modes in second-order pseudospin-Hall photonic systems

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