Applications of Topological Photonics in Integrated Photonic Devices

Wu, You; Li, Chong; Hu, Xiaoyong; Ao, Yutian; Zhao, Yifan; Gong, Qihuang

doi:10.1002/adom.201700357

Cited by 140 publications

(67 citation statements)

References 146 publications

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“…Introduction.-Topological photonic systems have attracted significant recent interest due to their potential applications as disorder-robust waveguides and delay lines [1,2]. Topological protection is, however, both a blessing and a curse: steering the flow of light between different channels requires the ability to switch between topological phases by inducing band inversions.…”

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confidence: 99%

Reconfigurable Topological Phases in Next-Nearest-Neighbor Coupled Resonator Lattices

et al. 2018

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We present a reconfigurable topological photonic system consisting of a 2D lattice of coupled ring resonators, with two sublattices of site rings coupled by link rings, which can be accurately described by a tight-binding model. Unlike previous coupled-ring topological models, the design is translationally invariant, similar to the Haldane model, and the nontrivial topology is a result of next-nearest couplings with nonzero staggered phases. The system exhibits a topological phase transition between trivial and spin Chern insulator phases when the sublattices are frequency detuned. Such topological phase transitions can be easily induced by thermal or electro-optic modulators, or nonlinear cross phase modulation. We use this lattice to design reconfigurable topological waveguides, with potential applications in on-chip photon routing and switching.

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confidence: 99%

Reconfigurable Topological Phases in Next-Nearest-Neighbor Coupled Resonator Lattices

et al. 2018

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“…For reviews of topological photonics itself, and its relevance to topological condensed matter physics, the readers can refer to Ref. [16][17][18][19][20][21][22]. Figure 1 displays a summary of different types of topological lasers.…”

Section: Introductionmentioning

confidence: 99%

Active topological photonics

et al. 2020

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Topological photonics has emerged as a novel route to engineer the flow of light. Topologically-protected photonic edge modes, which are supported at the perimeters of topologically-nontrivial insulating bulk structures, have been of particular interest as they may enable low-loss optical waveguides immune to structural disorder. Very recently, there is a sharp rise of interest in introducing gain materials into such topological photonic structures, primarily aiming at revolutionizing semiconductor lasers with the aid of physical mechanisms existing in topological physics. Examples of remarkable realizations are topological lasers with unidirectional light output under time-reversal symmetry breaking and topologically-protected polariton and micro/nano-cavity lasers. Moreover, the introduction of gain and loss provides a fascinating playground to explore novel topological phases, which are in close relevance to non-Hermitian and paritytime symmetric quantum physics and are in general difficult to access using fermionic condensed matter systems. Here, we review the cutting-edge research on active topological photonics, in which optical gain plays a pivotal role. We discuss recent realizations of topological lasers of various kinds, together with the underlying physics explaining the emergence of topological edge modes. In such demonstrations, the optical modes of the topological lasers are determined by the dielectric structures and support lasing oscillation with the help of optical gain. We also address recent researches on topological photonic systems in which gain and loss themselves essentially influence on topological properties of the bulk systems. We believe that active topological photonics provides powerful means to advance micro/nanophotonics systems for diverse applications and topological physics itself as well.

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“…Since the edge states are not only theoretically significant but also of application importance, it is desirable to establish the existing conditions of edge states based on firm theories. Recently, between two PCs with different topological invariants, e.g., Zak phase [11][12][13][14], Chern number [15][16][17][18], spin Chern number [19][20][21][22], valley Chern number [23][24][25][26], edge states are found due to the topological protection [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Edge states in self-complementary checkerboard photonic crystals: Zak phase, surface impedance, and experimental verification

et al. 2018

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Edge states of photonic crystals have attracted much attention for the potential applications such as high transmission waveguide bends, spin dependent splitters and one-way photonic circuits. Here, we theoretically discuss and experimentally observe the deterministic edge states in checkerboard photonic crystals. Due to the self-complementarity of checkerboard photonic crystals, a common band gap is structurally protected between two photonic crystals with different unit cells.Deterministic edge states are found inside the common band gap by exploiting the Zak phase analysis and surface impedance calculation. These edge states are also confirmed by a microwave experiment.

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Applications of Topological Photonics in Integrated Photonic Devices

Cited by 140 publications

References 146 publications

Reconfigurable Topological Phases in Next-Nearest-Neighbor Coupled Resonator Lattices

Reconfigurable Topological Phases in Next-Nearest-Neighbor Coupled Resonator Lattices

Active topological photonics

Edge states in self-complementary checkerboard photonic crystals: Zak phase, surface impedance, and experimental verification

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