Valley-contrasting physics in all-dielectric photonic crystals: Orbital angular momentum and topological propagation

Chen, Xiao; Zhao, Fuli; Chen, Min; Dong, Jian‐Wen

doi:10.1103/physrevb.96.020202

Cited by 285 publications

(229 citation statements)

References 38 publications

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“…Also, although trivial Type III edge states are not guaranteed to exist, they do here for this choice of parameters, (see Supplementary Material). Notably, the C 3v and C 6v Type I cases are mathematically identical to canonical honeycomb structure which has been the subject of other works [31,52], as they share the same symmetries.…”

Section: B Edge Statesmentioning

confidence: 80%

“…An advantage of these topological valley modes is that they only require the breaking of an inversion symmetry and/or a mirror symmetry; consequently, topological valley states in plasmonics enable more robust plasmonic modes whilst remaining within reach of current experimental set-ups. Existing work on topological valley effects in photonics has focused on hexagonal and triangular structures [27][28][29][30][31]. In plasmonics, graphene was proposed to host topological valley modes at infrared frequencies by imposing a triangular structured doping landscape on a graphene sheet using a metagate [32], and designer (spoof) plasmons were used to experimentally probe these effects at microwave frequencies [33].…”

mentioning

confidence: 99%

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Manipulating topological valley modes in plasmonic metasurfaces

et al. 2020

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The coupled light-matter modes supported by plasmonic metasurfaces can be combined with topological principles to yield subwavelength topological valley states of light. We give a systematic presentation of the topological valley states available for lattices of metallic nanoparticles: All possible lattices with hexagonal symmetry are considered, as well as valley states emerging on a square lattice. Several unique effects which have yet to be explored in plasmonics are identified, such as robust guiding, filtering and splitting of modes, as well as dual-band effects. We demonstrate these by means of scattering computations based on the coupled dipole method that encompass the full electromagnetic interactions between nanoparticles.

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Section: B Edge Statesmentioning

confidence: 80%

mentioning

confidence: 99%

Manipulating topological valley modes in plasmonic metasurfaces

et al. 2020

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“…With tunable geometric structures and controllable band dispersions, PCs provide a good platform to emulate topological behaviors. For example, researchers have successfully observed the photonic analog of quantum Hall, spin Hall, and valley Hall effect in PCs [28][29][30][31][32][33][34][35][36][37]. However, most reported 2D topological PCs require a metallic cover in experiment to prevent the radiation of electromagnetic waves into free space.…”

mentioning

confidence: 99%

Direct Observation of Corner States in Second-Order Topological Photonic Crystal Slabs

et al. 2019

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Recently, higher-order topological phases that do not obey the usual bulk-edge correspondence principle have been introduced in electronic insulators and brought into classical systems, featuring with in-gap corner/hinge states. In this letter, using near-field scanning measurements, we show the direct observation of corner states in second-order topological photonic crystal slabs consisting of periodic dielectric rods on a perfect electric conductor. Based on the generalized two-dimensional Su-Schrieffer-Heeger model, we show that the emergence of corner states roots in the nonzero edge dipolar polarization instead of the nonzero bulk quadrupole polarization.We demonstrate the topological transition of two-dimensional Zak phases of PC slabs by tuning intra-cell distances between two neighboring rods. We also directly observe in-gap onedimensional edge states and zero-dimensional corner states in the microwave regime. Our work presents that the PC slab is a powerful platform to directly observe topological states, and paves the way to study higher-order photonic topological insulators.

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“…[5] Inspired by valleytronics of graphene-like materials, [6][7][8][9] the research on binary valley states has been extended to optical and acoustic systems, where the band extrema originate from Brillouin zone corner (i.e., K and K ). [13,14] Such zone-corner extrema will further show localized Berry curvatures with non-trivial bulk topology, enabling valleyinduced edge transport between two topologically distinct domains. [13,14] Such zone-corner extrema will further show localized Berry curvatures with non-trivial bulk topology, enabling valleyinduced edge transport between two topologically distinct domains.…”

Section: Introductionmentioning

confidence: 99%

“…[29][30][31][32][33] Recently, the emergence of topological photonics gives a new degree of freedom, that is, pseudospin, to resolve the multimodes in near-field region. [13,14] Thus, instead of coupling with different wavevectors, the binary valley states can be selectively excited by using a source in match with their OAM-like phase vortex, which is known as photonic valley Hall effect. [13,14] Thus, instead of coupling with different wavevectors, the binary valley states can be selectively excited by using a source in match with their OAM-like phase vortex, which is known as photonic valley Hall effect.…”

Section: Introductionmentioning

confidence: 99%

Selective Excitation of Band Extrema in Valley Photonic Crystals

Yuan

Zhao

et al. 2019

Annalen der Physik

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Flexible control of building blocks of photonic crystals enables achieving desirable band structures. Exploration of photonic band extrema has brought many fantastic features to design artificial optical materials, such as Brillouin-zone-corner extrema for valley photonic materials and zone-center extremum for zero-index metamaterials. However, two such kinds of extrema are always found independently in different photonic crystals. In this work, a kind of valley photonic crystals possessing both zone-center and zone-corner band extrema almost at the same frequency is proposed. Inspired by antennas theory, a three-antenna array (TAA) source is devoted to individually manipulate each extremum. The correlation coefficient is given to determine the coupling efficiency between the TAA source and extrema eigenmodes. By using a source with a high correlation coefficient, these extrema bulk states are selectively excited consistent with their eigenfields. Furthermore, three control cases are shown that multiple extrema points are simultaneously excited, in order to confirm the validity of the correlation coefficient. Finally, a potential application of a beam-steering device is proposed through selective excitation of ternary extrema. This work develops binary valley states into ternary mix states, rendering more degrees of freedom for on-chip optical information transport, particularly for beam steering and mode division multiplexing.

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Valley-contrasting physics in all-dielectric photonic crystals: Orbital angular momentum and topological propagation

Cited by 285 publications

References 38 publications

Manipulating topological valley modes in plasmonic metasurfaces

Manipulating topological valley modes in plasmonic metasurfaces

Direct Observation of Corner States in Second-Order Topological Photonic Crystal Slabs

Selective Excitation of Band Extrema in Valley Photonic Crystals

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