Nonlinear control of photonic higher-order topological bound states in the continuum

Light Science & Applications, Journal Year: 2021, Volume and Issue: 10(1)

Published: Aug. 10, 2021

Abstract Higher-order topological insulators (HOTIs) are recently discovered phases, possessing symmetry-protected corner states with fractional charges. An unexpected connection between these and the seemingly unrelated phenomenon of bound in continuum (BICs) was unveiled. When nonlinearity is added to HOTI system, a number fundamentally important questions arise. For example, how does couple higher-order BICs rest including states? In fact, thus far nonlinear HOTIs have remained unexplored. Here we unveil interplay nonlinearity, topology, photonic platform. We observe that also laser-written second-order lattice further demonstrate their coupling edge (but not bulk) modes under proper action both self-focusing defocusing nonlinearities. Theoretically, calculate eigenvalue spectrum analog Zak phase regime, illustrating BIC can be actively tuned by such HOTI. Our studies applicable other systems, promising applications emerging topology-driven devices.

Language: Английский

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Roadmap on topological photonics

Journal of Physics Photonics, Journal Year: 2022, Volume and Issue: 4(3), P. 032501 - 032501

Published: Jan. 25, 2022

Abstract Topological photonics seeks to control the behaviour of light through design protected topological modes in photonic structures. While this approach originated from studying electrons solid-state materials, it has since blossomed into a field that is at very forefront search for new types matter. This can have real implications future technologies by harnessing robustness applications devices. roadmap surveys some main emerging areas research within photonics, with special attention questions fundamental science, which an ideal position address. Each section provides overview current and challenges part field, highlighting most exciting opportunities developments.

Language: Английский

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

Reviews in Physics, Journal Year: 2022, Volume and Issue: 9, P. 100076 - 100076

Published: Aug. 15, 2022

Topological photonics has attracted increasing attention in recent years due to the unique opportunities it provides manipulate light a robust way immune disorder and defects. Up now, diverse photonic platforms, rich physical mechanisms fruitful device applications have been proposed for topological photonics, including one-way waveguide, lasing, nanocavity, Dirac Weyl points, Fermi arcs, nodal lines, etc. In this review, we provide an introduction field of through lens invariants bulk-boundary correspondence one, two, three dimensions, which may not only offer unified understanding about underlying robustness distinct phenomena light, but could also inspire further developments by introducing new unconventional research photonics.

Language: Английский

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Observation of novel topological states in hyperbolic lattices

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: May 26, 2022

Abstract The discovery of novel topological states has served as a major branch in physics and material sciences. To date, most the established have been employed Euclidean systems. Recently, experimental realization hyperbolic lattice, which is regular tessellation non-Euclidean space with constant negative curvature, attracted much attention. Here, we demonstrate both theory experiment that exotic can exist engineered lattices unique properties compared to their counterparts. Based on extended Haldane model, boundary-dominated first-order Chern edge state nontrivial real-space number achieved. Furthermore, show fractal-like midgap higher-order zero modes appear deformed lattices, increases exponentially lattice size. These are observed designed circuit networks by measuring site-resolved impedance responses dynamics voltage packets. Our findings suggest useful platform study phases beyond space, may potential applications field high-efficient devices, such lasers, enhanced responses.

Language: Английский

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Chiral-Symmetric Higher-Order Topological Phases of Matter

Physical Review Letters, Journal Year: 2022, Volume and Issue: 128(12)

Published: March 23, 2022

We introduce novel higher-order topological phases of matter in chiral-symmetric systems (class AIII the tenfold classification), most which would be misidentified as trivial by current theories. These are protected "multipole chiral numbers," bulk integer invariants that 2D and 3D built from sublattice multipole moment operators, defined herein. The value a number indicates how many degenerate zero-energy states localize at each corner system. generally boundary-obstructed robust presence chiral-symmetry-preserving disorder.

Language: Английский

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On-chip nanophotonic topological rainbow

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: May 11, 2022

The era of Big Data requires nanophotonic chips to have large information processing capacity. Multiple frequency on-chip devices are highly desirable for density integration, but such more susceptible structural imperfection because their nano-scale. Topological photonics provides a robust platform next-generation chips. Here we give an experimental report topological rainbow realized by employing translational deformation freedom as synthetic dimension. can separate, slow, and trap photonic states different frequencies into positions. A homemade scattering scanning near-field optical microscope with high resolution is introduced directly measure the effect silicon-based chip. based on dimension no restrictions lattice types, symmetries, materials, wavelength band, easy integration. This work builds bridge between silicon chip technologies photonics.

Language: Английский

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Higher-order topological polariton corner state lasing

Science Advances, Journal Year: 2023, Volume and Issue: 9(21)

Published: May 24, 2023

Unlike conventional laser, the topological laser is able to emit coherent light robustly against disorders and defects because of its nontrivial band topology. As a promising platform for low-power consumption, exciton polariton lasers require no population inversion, unique property that can be attributed part-light-part-matter bosonic nature strong nonlinearity polaritons. Recently, discovery higher-order topology has shifted paradigm physics states at boundaries boundaries, such as corners. However, corner have never been realized in system yet. Here, on basis an extended two-dimensional Su-Schrieffer-Heeger lattice model, we experimentally demonstrate perovskite polaritons achieved state lasing with low threshold (approximately microjoule per square centimeter) room temperature. The realization also provides mechanism localization under protection, paving way toward on-chip active polaritonics using

Language: Английский

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Realization of photonic p-orbital higher-order topological insulators

eLight, Journal Year: 2023, Volume and Issue: 3(1)

Published: March 13, 2023

Abstract The orbital degrees of freedom play a pivotal role in understanding fundamental phenomena solid-state materials as well exotic quantum states matter including superfluidity and topological semimetals. Despite tremendous efforts engineering synthetic cold-atom, electronic photonic lattices to explore physics, thus far high orbitals an important class materials, namely, higher-order insulators (HOTIs), have not been realized. Here, we demonstrate $$p$$ p -orbital corner HOTI, unveiling their underlying invariant, symmetry protection, nonlinearity-induced dynamical rotation. In Kagome-type find that the protection demands orbital-hopping addition generalized chiral symmetry. Due hybridization, nontrivial topology HOTI is “hidden” if bulk polarization used but manifested by winding number. Our work opens pathway for exploration intriguing mediated higher-band applicable broad spectrum systems.

Language: Английский

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Roadmap on photonic metasurfaces

Applied Physics Letters, Journal Year: 2024, Volume and Issue: 124(26)

Published: June 24, 2024

Here we present a roadmap on Photonic metasurfaces. This document consists of number perspective articles different applications, challenge areas or technologies underlying photonic Each will introduce the topic, state art as well give an insight into future direction subfield.

Language: Английский

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Hyperbolic photonic topological insulators

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Feb. 22, 2024

Abstract Topological photonics provides a new degree of freedom to robustly control electromagnetic fields. To date, most established topological states in have been employed Euclidean space. Motivated by unique properties hyperbolic lattices, which are regular tessellations non-Euclidean space with constant negative curvature, the boundary-dominated proposed. However, limited highly crowded boundary resonators and complicated site couplings, insulator has only experimentally constructed electric circuits. How achieve photonic insulators is still an open question. Here, we report experimental realization using coupled ring on silicon chips. Boundary-dominated one-way edge pseudospin-dependent propagation directions observed. Furthermore, robustness also verified. Our findings potential applications field designing high-efficient devices enhanced responses.

Language: Английский

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