Dual-Polarization Second-Order Photonic Topological Insulators

Chen, Yafeng; Meng, Fei; Lan, Zhihao; Jia, Baohua; Huang, Xiaodong

doi:10.1103/physrevapplied.15.034053

Cited by 43 publications

(10 citation statements)

References 63 publications

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“…This may find possible applications in quantuminformation processes, e.g., by placing quantum emitters into array of topological corner states, robust strong coupling and entanglement between these emitters could be fulfilled with the assistance of topological edge states [261]. The recently proposed dual-polarization topological corner states for both TE and TM modes [262] and a new principle for creating corner states within odd-order bandgaps in C 4v -symmetric lattices beyond the 2D SSH paradigm [263] open new possibilities for both fundamental science and promising applications.…”

Section: Second-order Photonic Topological Corner Statesmentioning

confidence: 99%

A brief review of topological photonics in one, two, and three dimensions

Lan,

Chen,

Gao

et al. 2022

Preprint

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FIG. 2. 1D photonic SSH systems and their applications. (a) Near-field imaging of topological edge states in plasmonic nanochains. Reproduced with permission from [51], Copyright (2021), under CC BY-NC-ND. (b) Lasing at the topological edge states in a photonic crystal nanocavity dimer array. Reproduced with permission from [57], Copyright (2019), under CC BY 4.0. (c) Selective enhancement of interface states in a dielectric resonator chain. Reproduced with permission from [60], Copyright (2015), under CC BY 4.0. (d) Periodically bended ultrathin metallic waveguides for the observation of anomalous π modes via photonic floquet engineering. Reproduced with permission from [66], Copyright (2019) by the American Physical Society. (e) Protection of biphoton entanglement in an array of silicon nanowires. Reproduced with permission from [68], Copyright (2018) by the American Association for the Advancement of Science. (f) Photonic topological baths for quantum simulation. Reproduced with permission from [70], Copyright (2022) by the American Chemical Society. (g) Two coupled topological interfaces in waveguide arrays. Reproduced with permission from [72], Copyright (2020) by the American Chemical Society. (h) Selective excitation of topological edge states controlled by the handedness of incident light. Reproduced with permission from [76], Copyright (2016) by John Wiley and Sons.

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Section: Second-order Photonic Topological Corner Statesmentioning

confidence: 99%

A brief review of topological photonics in one, two, and three dimensions

Lan,

Chen,

Gao

et al. 2022

Preprint

Self Cite

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“…We focus on the transverse magnetic (TM) modes of the PC herein and, for simplicity, the frequency f is normalized with respect to a/λ. Previous studies of SPTIs based on the 2D Su-Schrieffer-Heeger model suggest that choosing the unit cell (UC) in different ways can lead to distinct topological behaviors of the system [12][13][14][15]21,[44][45][46]. To create topological band gaps, we select two different UCs (UC1 and UC2) from the PC [Fig.…”

Section: Design Of the Systemmentioning

confidence: 99%

Topologically protected second harmonic generation via doubly resonant high-order photonic modes

Chen

Lan

et al. 2021

Phys. Rev. B

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“…Topologically protected polarization-independent optics would give them additional resistance to perturbation. It is worth noting that dual-polarization second-order photonic topological states have been proposed by Chen et al recently, based on a topologically optimized geometric structure within a square-lattice [28]. However, eigenfrequencies of topological states for the two polarizations are not the same, despite they have a common topological bandgap.…”

Section: Introductionmentioning

confidence: 99%

Polarization-independent second-order photonic topological corner states

Lei¹,

Xiao²,

Liu³

et al. 2023

Preprint

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Recently, much attention has been paid to second-order photonic topological insulators (SPTIs), because of their support for highly localized corner states with excellent robustness. SPTIs have been implemented in either transverse magnetic (TM) or transverse electric (TE) polarizations in two-dimensional (2D) photonic crystals (PCs), and the resultant topological corner states are polarization-dependent, which limits their application in polarization-independent optics. However, to achieve polarization-independent corner states is not easy, since they are usually in-gap and the exact location in the topological bandgap is not known in advance. Here, we report on a SPTI based on a 2D square-lattice PC made of an elliptic metamaterial, and whether the bandgap is topological or trivial depends on the choice of the unit cell. It is found that locations of topological bandgaps of TM and TE polarizations in the frequency spectrum can be independently controlled by the out-of-plane permittivity ε ⊥ and in-plane permittivity ε ∥ , respectively, and more importantly, the location of in-gap corner states can also be separately manipulated by them. From this, we achieve topological corner states for both TM and TE polarizations with the same frequency in the PC by adjusting ε ⊥ and ε ∥ , and their robustness against disorders and defects are numerically demonstrated. The proposed SPTI provides a potential application scenario for polarization-independent topological photonic devices.

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Dual-Polarization Second-Order Photonic Topological Insulators

Cited by 43 publications

References 63 publications

A brief review of topological photonics in one, two, and three dimensions

A brief review of topological photonics in one, two, and three dimensions

Topologically protected second harmonic generation via doubly resonant high-order photonic modes

Polarization-independent second-order photonic topological corner states

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