Topological Optical Waveguiding in Silicon and Beating between Trivial and Topological Defect Modes

Blanco‐Redondo, Andrea; Andonegui, Imanol; Collins, Matthew J.; Harari, Gal; Lumer, Yaakov; Rechtsman, Mikael C.; Eggleton, Benjamin J.; Segev, Mordechai

doi:10.1364/cleo_qels.2016.fm3a.5

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…18 In addition to the edge state in the 2-D system, the topological states in the one dimensional (1-D) system also have been demonstrated by metamaterials, 19 resonant dielectric structure, [20][21][22] photonic/phononic crystals, [23][24][25] and 1-D waveguide array. 26,27 The topological interface state between two crystals with distinct topological gap has been demonstrated, which can be used for the field enhancement. 25 Very recently, this interface state has been used to determine the topological invariants of the polaritonic quasicrystals, 28 and the chiral edge states in 1-D double coupled Peierls chain have been observed for the first time.…”

Section: Introductionmentioning

confidence: 99%

Experimental demonstration of the robust edge states in a split-ring-resonator chain

et al. 2018

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One of the fascinating topological phenomena is the edge state in one-dimensional system. In this work, the topological photonics in the dimer chains composed by the split ring resonators are revealed based on the Su-Schrieffer-Heeger model. The topologically protected photonic edge state is observed directly with the in situ measurements of the local density of states in the topological nontrivial chain. Moreover, we experimentally demonstrate that the edge state localized at both ends is robust against a varied of perturbations, such as losses and disorder. Our results not only provide a versatile platform to study the topological physics in photonics but also may have potential applications in the robust power transfer.

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Section: Introductionmentioning

confidence: 99%

Experimental demonstration of the robust edge states in a split-ring-resonator chain

et al. 2018

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“…With the non-zero coupling energy in a finite-size system, the group velocity of microwave propagation is directly measured through pulse excitations, revealing a very slow group velocity, down to ∼ 0.01 of light speed in free space. The transport length revealed and verified in our experiments provides a crucial guideline for utilizing photonic topological devices, which demonstrates the possibility to transport optical information with topological protection [24][25][26][27][28].…”

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confidence: 91%

Probing topological protected transport in finite-sized Su-Schrieffer-Heeger chains

Chang

Torres

Manrique

et al. 2022

Preprint

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In order to transport information with topological protection, we reveal and demonstrate experimentally the existence of a characteristic length $L_c$, coined as the transport length, in the bulk size for edge states in one-dimensional Su-Schrieffer-Heeger (SSH) chains. In spite of the corresponding wavefunction amplitude decays exponentially, characterized by the penetration depth ξ, the transport between two edge states remains possible even when the lattice size L is much larger than the penetration depth, i.e., ξ << L << Lc. Due to the non-zero coupling energy in a finite-size system, the supported SSH edge states are not completely isolated at the two ends, giving an abrupt change in the wave localization, manifested through the inverse participation ratio to the lattice size. To verify such a non-exponential scaling factor to the system size, we implement a chain of split-ring resonators and their complementary ones with controllable hopping strengths. By performing the measurements on the group velocity from the transmission spectroscopy of non-trivially topological edge states with pulse excitations, the transport velocity between two edge states is directly observed with the number of lattices up to 20. Along the route to harness topology to protect optical information, our experimental demonstrations provide a crucial guideline for utilizing photonic topological devices.

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“…The simplest 1D model with a topological band structure is a chain of sites with alternating coupling, which was originally introduced by Su, Schrieffer and Heeger (SSH) to describe fractionalized charges in polyacetylene [31]. Recently, the related 1D topological phases have also been proposed in optical systems with photonic crystals [32][33][34][35][36], electromagnetic metamaterials [37][38][39] and zigzag chains of dielectric and plasmonic nanoparticles [40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable topological phases in photoexcited graphene nanoribbon arrays

Zhang¹,

Wu²,

Zhang³

2018

J. Opt.

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We introduced here a reconfigurable topological phase using optically pumped graphene nanoribbon arrays with homogeneous spacing at terahertz frequencies. By adjusting the profile of imaginary potential, various topologically non-trivial dimer chains composed of graphene nanoribbons can be selectively produced. These dimer chains support different kinds of midgap states. Moreover, we numerically demonstrated that these midgap states are robust against some perturbations, such as non-Hermitian and lattice disorders, and can be further adjusted by varying the pumping strength on the specific graphene nanoribbon. Consequently, the reconfigurable topological phase can be obtained by only tuning the profile of imaginary potential without altering the geometry of the system. These tunable topological phases may provide a convenient method to tune the spatial profile of graphene-based topological lasers and have potential applications in topologically protected waveguiding in terahertz frequency range.

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Topological Optical Waveguiding in Silicon and Beating between Trivial and Topological Defect Modes

Cited by 3 publications

References 6 publications

Experimental demonstration of the robust edge states in a split-ring-resonator chain

Experimental demonstration of the robust edge states in a split-ring-resonator chain

Probing topological protected transport in finite-sized Su-Schrieffer-Heeger chains

Reconfigurable topological phases in photoexcited graphene nanoribbon arrays

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