Lasing from Multipolar Modes of Topological Corner States

Kim, Ha‐Reem; Hwang, Min-Soo; Jeong, Kwang‐Yong; Kivshar, Yuri S.; Park, Hong Gyu

doi:10.1364/cleo_qels.2021.fth4h.5

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…In this respect, further studies to produce a two-dimensional topological beaming effect are important for the sake of practicality of the proposed concept. We consider that it should be made possible with two-dimensional Dirac mass distributions or bi-grating designs that accommodate higher-order topological states ( 45 – 48 ). From a broader perspective, our result and an associated follow-up study may motivate various research topics for the development of non-Hermitian topological nanophotonic elements in which interplay between topological states, internal gain or loss, and the external radiation continuum might create novel optical effects and concomitant device applications beyond the present limitations.…”

Section: Discussionmentioning

confidence: 99%

Topological beaming of light

et al. 2022

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Nanophotonic light emitters are key components in numerous application areas because of their compactness and versatility. Here, we propose a topological beam emitter structure that takes advantage of submicrometer footprint size, small divergence angle, high efficiency, and adaptable beam shaping capability. The proposed structure consists of a topological junction of two guided-mode resonance gratings inducing a leaky Jackiw-Rebbi state resonance. The leaky Jackiw-Rebbi state leads to in-plane optical confinement with funnel-like energy flow and enhanced emission probability, resulting in highly efficient optical beam emission. In addition, the structure allows adaptable beam shaping for any desired positive definite profiles by means of Dirac mass distribution control, which can be directly encoded in lattice geometry parameters. Therefore, the proposed approach provides highly desirable properties for efficient micro–light emitters and detectors in various applications including display, solid-state light detection and ranging, laser machining, label-free sensors, optical interconnects, and telecommunications.

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Section: Discussionmentioning

confidence: 99%

Topological beaming of light

et al. 2022

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“…Understanding intrinsic mechanisms of absorption as well as spontaneous and stimulated emissions leads to the development of practical applications such as solar cells, LEDs, and lasers [3]. Introducing topology into light-matter interaction could bring new advances such as topological lasers [4][5][6][7], in which monochromaticity, efficiency, and emission stability become superior to those observed for conventional lasers. To unleash the power of topology in light-matter interaction [8], it is important to understand the role of topological phases at the microscopic level of quantum electrodynamics (QED).…”

Section: Introductionmentioning

confidence: 99%

Topological inverse band theory in waveguide quantum electrodynamics

Ke¹,

Huang²,

Liu³

et al. 2023

Preprint

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Topological phases play a crucial role in both fundamental physics of light-matter interaction and emerging quantum technologies. However, due to photonic scattering the topological band theory of waveguide QED systems is known to break down, because the energy bands become divergent and disconnected. Here, we introduce a concept of the inverse energy band and explore analytically the topological scattering in a waveguide with an array of quantum emitters. We uncover a rich structure of topological phase transitions, symmetric scale-free localization, completely flat bands, and the corresponding dark Wannier states. While bulk-edge correspondence is broken, the Zak phase of inverse energy band can be extracted via long-time average of mean cell position in quantum walks. Surprisingly, the winding number of the scattering textures depends on both the topological phase of inverse subradiant band and the odevity of the cell number. Our work opens a novel field of the topological inverse bands, and it brings a fundamental vision on topological phases in light-matter interactions.

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“…Hence, the implementation of robust topological protection of the 0D localized mode would boost the progress in these related fields. Recently, emerging seminal concepts with higher-order topological insulators (HOTIs) (26)(27)(28)(29)(30)(31) and the Dirac vortex method (13) verified the promising routes for topological light localizations, e.g., showing several advantages in topological lasing. However, HOTIs need multiple domains of different unit cell designs to localize modes at the boundary between the domains.…”

Section: Introductionmentioning

confidence: 99%