Polarization-Orthogonal Nondegenerate Plasmonic Higher-Order Topological States

Xu, Su; Zhang, Zijian; Yang, Yumeng; Xie, Xinrong; Ye, Wenzheng; Liu, Feng; Xue, Haoran; Jing, Liqiao; Wang, Zuojia; Chen, Qi‐Dai; Sun, Hong‐Bo; Li, Er‐Ping; Chen, Hongsheng; Gao, Fei

doi:10.1103/physrevlett.130.213603

Cited by 20 publications

(3 citation statements)

References 59 publications

(85 reference statements)

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“…Till now, researchers usually judge the topological states in a photonic crystal based on three criterions. The topological invariant, including Chern Number, winding number and Z 2 topological invariant [ 12 – 17 ]; the eigenvalue distributions or gaps in the band of photonics crystal [ 18 – 21 ]; the electric field distributions of the topological states [ 3 , 22 ]. Almost all the previous methods rely on the band structures in the momentum spaces.…”

Section: Introductionmentioning

confidence: 99%

Information-entropy enabled identifying topological photonic phase in real space

Ma,

Yan,

Luo

et al. 2024

Front. Optoelectron.

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The topological photonics plays an important role in the fields of fundamental physics and photonic devices. The traditional method of designing topological system is based on the momentum space, which is not a direct and convenient way to grasp the topological properties, especially for the perturbative structures or coupled systems. Here, we propose an interdisciplinary approach to study the topological systems in real space through combining the information entropy and topological photonics. As a proof of concept, the Kagome model has been analyzed with information entropy. We reveal that the bandgap closing does not correspond to the topological edge state disappearing. This method can be used to identify the topological phase conveniently and directly, even the systems with perturbations or couplings. As a promotional validation, Su–Schrieffer–Heeger model and the valley-Hall photonic crystal have also been studied based on the information entropy method. This work provides a method to study topological photonic phase based on information theory, and brings inspiration to analyze the physical properties by taking advantage of interdisciplinarity. Graphical Abstract

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Section: Introductionmentioning

confidence: 99%

Information-entropy enabled identifying topological photonic phase in real space

Ma,

Yan,

Luo

et al. 2024

Front. Optoelectron.

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“…[ 30 ] Recently, the strategy of employing orbitals to enable topological phases was extended to higher‐order topology in photonics and plasmonics: for example, photonic quadrupolar topological insulators were realized by harnessing s and p orbital modes to induce an artificial magnetic flux, [ 31 ] photonic higher‐order topological insulators with p orbitals were demonstrated [ 32 ] and also plasmonic higher‐order topological states with orthogonal nondegenerate orbital‐like modes were reported. [ 33 ] The approach of cluster orbitals has also been used to realize acoustic topological insulators, such as the acoustic quantum spin Hall effect [ 34 ] and tunable topology of a phononic bandgap [ 35 ] supported through d and p orbital‐like modes.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Higher‐Order Topological Insulators Induced by Orbital‐Interactions

Gao,

Peng,

Xiang

et al. 2024

Advanced Materials

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The discovery of higher‐order topological insulator metamaterials, in analogy with their condensed‐matter counterparts, has enabled various breakthroughs in photonics, mechanics, and acoustics. A common way of inducing higher‐order topological wave phenomena is through pseudo‐spins, which mimic the electron spins as a symmetry‐breaking degree of freedom. Here we exploit degenerate orbitals in acoustic resonant cavities to demonstrate versatile, orbital‐selective, higher‐order topological corner states. Type‐II corner states are theoretically investigated and experimentally demonstrated based on tailored orbital interactions, without the need for long‐range hoppings that has so far served as a key ingredient for Type‐II corner states in single‐orbital systems. Due to the orthogonal nature of the degenerate p orbitals, we also introduce a universal strategy to realize orbital‐dependent edge modes, featuring high‐Q edge states identified in bulk bands. Our findings provide an understanding of the interplay between acoustic orbitals and topology, shedding light on orbital‐related topological wave physics, as well as its applications for acoustic sensing and trapping.This article is protected by copyright. All rights reserved

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“…While higher-order topological corner states in photonic systems have been implemented in different platforms, such as photonic crystals [24][25][26][27][28][29][30] , coupled ring resonators 31 , waveguide arrays 32 (typically used for transmission). The commonly used lattices for constructing corner states include a square lattice [24][25][26][27][28][29] , Kagome lattice [33][34][35]30 and honeycomb lattice 36,37 . Compared to topological edge states, the higher-order topological corner state offers a smaller mode volume [26][27][28][29] , resulting a higher Purcell factor, or vacuum Rabi splitting even with a modest Q factor 38 .…”

Section: Introductionmentioning

confidence: 99%

Single photon emitter deterministically coupled to a topological corner state

Rao,

Shi,

Rao

et al. 2024

Light Sci Appl

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Incorporating topological physics into the realm of quantum photonics holds the promise of developing quantum light emitters with inherent topological robustness and immunity to backscattering. Nonetheless, the deterministic interaction of quantum emitters with topologically nontrivial resonances remains largely unexplored. Here we present a single photon emitter that utilizes a single semiconductor quantum dot, deterministically coupled to a second-order topological corner state in a photonic crystal cavity. By investigating the Purcell enhancement of both single photon count and emission rate within this topological cavity, we achieve an experimental Purcell factor of Fp = 3.7. Furthermore, we demonstrate the on-demand emission of polarized single photons, with a second-order autocorrelation function g(2)(0) as low as 0.024 ± 0.103. Our approach facilitates the customization of light-matter interactions in topologically nontrivial environments, thereby offering promising applications in the field of quantum photonics.

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Polarization-Orthogonal Nondegenerate Plasmonic Higher-Order Topological States

Cited by 20 publications

References 59 publications

Information-entropy enabled identifying topological photonic phase in real space

Information-entropy enabled identifying topological photonic phase in real space

Acoustic Higher‐Order Topological Insulators Induced by Orbital‐Interactions

Single photon emitter deterministically coupled to a topological corner state

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