Topological phase transition induced by gain and loss in a photonic Chern insulator

Teo, Hau Tian; Xue, Haoran; Zhang, Baile

doi:10.1103/physreva.105.053510

Cited by 14 publications

(3 citation statements)

References 54 publications

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“…Finally, on the fundamental physics aspects, although TPSs in GPCs are well studied in Hermitian and linear systems, there are still much to be explored by further introducing non-Hermitian and/or nonlinear effect. [103] It can be predicted that there are still a series of important problems worth further exploration, such as interactions between TPSs and other topological and nontopological photonic states, [90] gyromagnetic high-order TPSs, [41,85] 3D GPCs, [45] etc. Solving these im-portant problems will not only help to deepen the understanding of some basic principles of topological photonic system, but also greatly enrich the research connotation of topological photonics.…”

Section: Discussionmentioning

confidence: 99%

Topological photonic states in gyromagnetic photonic crystals: Physics, properties, and applications

Chen¹,

Li²

2022

Chinese Phys. B

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Topological photonic states (TPSs) as a new type of waveguide state with one-way transport property can resist backscattering and are impervious to defects, disorders and metallic obstacles. Gyromagnetic photonic crystal (GPC) is the first artificial microstructure to implement TPSs, and it is also one of the most important platforms for generating truly one-way TPSs and exploring their novel physical properties, transport phenomena and advanced applications. Herein, we present a brief review of the fundamental physics, novel properties and practical applications of TPSs based on GPCs. We first examine chiral one-way edge states existing in uniformly magnetized GPCs of ordered and disordered lattices, antichiral one-way edge states in cross magnetized GPCs, and robust one-way bulk states in heterogeneously magnetized GPCs. Then, we discuss the strongly coupling effect between two co-propagating (or counter-propagating) TPSs and the resulting physical phenomena and device applications. Finally, we analyze the key issues and prospect the future development trends for TPSs in GPCs. The purpose of this brief review is to provide an overview of the main features of TPSs in GPC systems and offer a useful guidance and motivation for interested scientists and engineers working in related scientific and technological areas.

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Section: Discussionmentioning

confidence: 99%

Topological photonic states in gyromagnetic photonic crystals: Physics, properties, and applications

Chen¹,

Li²

2022

Chinese Phys. B

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“…There are also great efforts to study non-Hermitian photonic topological states, mainly in one-dimensional systems [40][41][42][43][44][45][46][47][48][49][50]. However there is less work on non-Hermitian photonic Chern insulators using two-dimensional photonic crystals [51][52][53][54]. Our study here shall stimulate further interest in non-Hermitian Chern insulator phases in twodimensional photonic crystals as continuous systems.…”

Section: Introductionmentioning

confidence: 97%

Photonic corner skin modes

Wang¹,

Gong²

2023

Preprint

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Useful in the enhancement of light-matter interaction, localization of light is at the heart of photonics studies. Different approaches have been proposed to localize light, including those based on dynamical localization, topological trivial or nontrivial defects in the band gap of photonic crystals, and bound states in the continuum. Recent studies on non-Hermitian skin effect have provided us new means to localize waves. In this work, we propose a new method towards localized light, called photonic corner skin modes arising from second-order non-Hermitian skin effect and gain-loss symmetry on a lattice. Specifically, we propose to make use of small pseudo-inversion symmetric gain/loss, which does not close the band gap, to realize a photonic Chern insulator with chiral edge states. The chiral edge states then accumulate at certain corners of the system. Intriguing phenomena such as corner skin modes arising from an underlying bipolar second-order non-Hermitian skin effect and multiple-corner skin modes are predicted in continuous systems.

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“…Higher-order topological insulators and topological materials of topological PCs have been widely studied [3,4]. Extensive researches have been conducted on the topological phase in PCs to explore its properties [5][6][7]. The topological phases in * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

All-optical logic gates based on topological edge and corner states in two-dimensional photonic crystals with square dielectric columns

Gao,

Zhou,

et al. 2024

J. Phys. D: Appl. Phys.

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Recently, with the rapid progress in all-optical networks and optical computing, there is an increasing requirement for more appropriate methods to design all-optical logic gates. Photonic crystals (PCs) can be serving as a versatile platform for manipulating light propagation. The realization of topological edge states (TESs) and topological corner states (TCSs) within high-order topological photonic insulators has attracted extensive attention. In this paper, TESs and TCSs are achieved using honeycomb photonic crystals (PCs) with square dielectric columns instead of conventional cylindrical ones for obtaining a larger photonic energy band gap due to reduction of dielectric column symmetry. TESs with overlapping frequencies can be attained by different arrangements of combining two PCs with distinct topological properties. A sandwich structure comprising both topologically trivial and non-trivial PCs is proposed, and "AND Gate" and "OR Gate" logic gates are implemented through the coupling between edge state waveguides when controlling the number of coupling layers. Additionally, a triangular-shaped box structure composed of non-trivial PCs enveloped by trivial PCs is constructed. Within this structure, TCSs manifest only around each acute angle, and a "NOT Gate" logic gate is realized through corner state coupling and edge state coupling. This work paves a new way of designing high-performance micro-nano all-optical logic gate devices.

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Topological phase transition induced by gain and loss in a photonic Chern insulator

Cited by 14 publications

References 54 publications

Topological photonic states in gyromagnetic photonic crystals: Physics, properties, and applications

Topological photonic states in gyromagnetic photonic crystals: Physics, properties, and applications

Photonic corner skin modes

All-optical logic gates based on topological edge and corner states in two-dimensional photonic crystals with square dielectric columns

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