Slow light with low group-velocity dispersion at the edge of photonic graphene

Ouyang, Chunfang; Xiong, Zhaoming; Zhao, Fangyuan; Dong, Biqin; Hu, Xinhua; Liu, Xiaohan; Zi, Jian

doi:10.1103/physreva.84.015801

Cited by 18 publications

(10 citation statements)

References 29 publications

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“…The photonic band structure with the uniform column radii and the slabs widths are calculated as shown in Fig. 5(b), where two Dirac cones in K and K ′ points for transversemagnetic modes 40,43 are formed, resembling the lineardispersed Dirac cones of pristine graphene.…”

Section: Discussionmentioning

confidence: 99%

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Single-valley engineering in graphene superlattices

et al. 2015

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The two inequivalent valleys in graphene are protected against long range scattering potentials due to their large separation in momentum space. In tailored √ 3N × √ 3N or 3N × 3N graphene superlattices, these two valleys are folded into Γ and coupled by Bragg scattering from periodic adsorption. We find that, for top-site adsorption, strong inter-valley coupling closes the bulk gap from inversion symmetry breaking and leads to a single-valley metallic phase with quadratic band crossover. The degeneracy at the crossing point is protected by C3v symmetry. In addition, the emergence of pseudo-Zeeman field and valley-orbit coupling are also proposed, which provide the possibility of tuning valley-polarization coherently in analogy to real spin for spintronics. Such valley manipulation mechanisms can also find applications in honeycomb photonic crystals. We also study the strong geometry-dependent influence of hollow-and bridge-site adatoms in the inter-valley coupling.

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Section: Discussionmentioning

confidence: 99%

“…23,40,43 To model the √ 3 × √ 3 graphene supercell, we first classify the columns' radii into three categories r i (i=1-3) with r 3 = 0.18a as a reference, and the link width is chosen to be d = 0.10a with a being the distance between two nearest columns. …”

Section: Photonic-crystal Bandsmentioning

confidence: 99%

Single-valley engineering in graphene superlattices

et al. 2015

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“…[13], the author proposed that surface mode with low group-velocity dispersion can be excited at the edge of photonic graphene. In the honeymoon lattice of dielectric rods with the same parameters, two bands touch at the K point forming the Dirac point.…”

Section: Structure and Calculation Methodsmentioning

confidence: 99%

Surface Modes of Honeycomb Plasmonic Photonic Crystal for both TE and TM Polarizations

Chen

Fang

2015

Plasmonics

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To excite surface modes of photonic crystal for both transverse-electric (TE) and transverse-magnetic (TM) polarizations, we put forward a honeymoon lattice of plasmonic photonic crystal composed of dielectric and metallic rods. We investigate the band dispersions of the photonic crystal by finite element method (FEM) and supercell method. The surface modes for both TE and TM polarizations can be simultaneously excited on the zigzag edge. The surface modes on the metallic edge have near-zero group velocity. By introducing the surface defect into the zigzag metallic edge, the surface modes on the edge can be tuned and have negative group velocity.

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“…In contrast, for the edge modes away from the photonic bands there are nearly no bulk excitations. As shown by us [24], these edge modes are of subwavelength, similar to surface plasmons bounded at metallic surfaces [29].…”

mentioning

confidence: 96%

“…With the presence of edges, edge states within the PBG may appear with a sharp confinement of optical fields at the edges [24]. With further breaking the time-reversal symmetry, confined edge states become even unidirectional, showing robustness against scattering or disorder [7,[25][26][27][28].…”

mentioning

confidence: 99%

Wideband trapping of light by edge states in honeycomb photonic crystals

Ouyang

Han

Zhao

et al. 2012

J. Phys.: Condens. Matter

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Abstract. We study theoretically light propagations at the zigzag edge of a honeycomb photonic crystal consisting of dielectric rods in air, analogous to graphene. Within the photonic band gap of the honeycomb photonic crystal, a unimodal edge state may exist with a sharp confinement of optical fields. Its dispersion can be tuned simply by adjusting the radius of the edge rods. For the edge rods with a graded variation in radius along the edge direction, we show numerically that light beams of different frequencies can be trapped sharply in different spatial locations, rendering wideband trapping of light.

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Slow light with low group-velocity dispersion at the edge of photonic graphene

Cited by 18 publications

References 29 publications

Single-valley engineering in graphene superlattices

Single-valley engineering in graphene superlattices

Surface Modes of Honeycomb Plasmonic Photonic Crystal for both TE and TM Polarizations

Wideband trapping of light by edge states in honeycomb photonic crystals

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